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930 Transmission Rebuild, Early 1977 Box

Hi guys,

I have an early 930 Transmission that I want to rebuild. It is a 930/33 I believe, 1977 MY. It is very early in the production date and the Synchros and Sliders look like 1976 MY parts from what I can tell; i.e. Symmetrical Syncro Hub (Dogteeth) and symmetrical 1st to 2nd Shift Sleeve (Slider).

If I rebuild, should these be changed to the later Asymmetrical first gear Syncro Hub (Dogteeth) and Asymmetrical Shift Sleeve (Slider)?

I have not refined (reduced) the parts list yet as this list may serve to help others in the future. Here is the mess I have so far including parts I probably will not replace. Any help refining and reducing this to a final parts list to purchase will be appreciated. I bought this transmission used so I don't know what or if there were any issues with it but after disassembly the internals look pretty good.

I could also use the part number for: Synchro Hub 1st Gear(Dogteeth)(Need 1) Asymmetrical 930/33.

Re-Gear and Rebuild Parts List
Transmission Number: 930/33 7771258
Casting Number: 930 301 102 0R
Date: 8/76

This is an early 1977 930/33 transmission but has the Gear parts identical to the 1976 930/30 Transmissions

1st Gear, Stock…………………………………………… 2.250 (16:36)
New 2nd Gear, Custom Ratio…………………… 1.529 (17:26)
New 3rd Gear, Custom Ratio….………………… 1.038 (26:27)
4th Gear, Stock………………………………………… 0.656 (32:21)

Part Position, Part Numbers and Description from PET

POS Part Number Description

1st Gear 1976 930/30 Transmission
?? 930 302 241 03 Synchro Hub 1st Gear (Dogteeth)(Need 1)Symmetrical 930/30
38 930 302 315 00 Stone 1st Gear (Need 1) 930/30
41 930 302 301 00 Synchroniser Ring 1st Gear (Syncro) (Need 1) 930/30
45 930 302 411 00 Shift Sleeve 1st/2nd (Slider)(Need 1 for 1st/2nd) Symmetrical
47 928 302 319 08 Double Barricade Tape 1st Gear (Brake Band)(Need 1) 930/30
47/1 928 302 320 01 Stop 1st Gear Replacement not needed 930/30

2nd Gear 1976 930/30 Transmission
930 302 242 00 Synchro Hub 2nd Gear (Dogteeth)(Need 1)
38 930 302 315 00 Stone 1st/2nd Gear (2) 1976 Transmission 930/30
39 915 302 316 01 Brake Band 2nd Gear (2 Required)
40 930 302 321 00 Stop 2nd Gear
41 930 302 301 00 Synchroniser Ring 2nd Gear (Syncro) (Need 1) 930/30
45 930 302 411 00 Shift Sleeve 1st/2nd(Slider)(Need 1 for 1st/2nd) Symmetrical

OR… Use 1977 930/33 1st and 2nd Gear Parts

1st Gear 1977 930/33 Transmission
??Need part # Synchro Hub 1st Gear(Dogteeth)(Need 1) Asymmetrical 930/33
(38) 930 302 316 00 Stone 1st Gear 930/33 1977 Trans 930/33
41 930 302 301 00 Synchroniser Ring 1st Gear(Syncro)(Need 1) 1976 Trans 930/30
(45) 930 302 411 01 Shift Sleeve 1st to 2nd (Slider) Asymmetrical 1977 Trans 930/33
47 928 302 319 08 Double Barricade Tape 1st Gear(Brake Band) 1976 Trans 930/30
47/1 928 302 320 01 Stop 1st Gear Replacement not needed 1976 Trans 930/30

2nd Gear 1977 930/33 Transmission
930 302 242 00 Synchro Hub 2nd Gear (Dogteeth)(Need 1)
38 930 302 315 00 Stone 1st/2 Gear Need only 1 as 1st Gear gets#(38) 1976 Trans 930/30
(39) 928 302 318 02 Double Barricade Tape 1st Gear 1976 Trans 930/30
(40) 928 302 322 00 Stop 2nd Gear 1977 Trans 930/33
41 930 302 301 00 Synchroniser Ring 2nd Gear Symmetrical 1976 Trans 930/30
(45) 930 302 411 01 Shift Sleeve 1st to 2nd Asymmetrical 1977 Trans 930/33

3rd and 4th Gear
930 302 243 00 Synchro Hub 3rd & 4th(Dogteeth) (Need 1) Only need 1 for fourth) Pelican parts # 101550 319 M157 for 1978-79 MY
09 930 302 325 00 Stone 3rd/4th Gear (Need 2, One for third and one for fourth)
10 911 302 316 00 Brake Band 3rd/4th (Need 4, Two for third and two for fourth)
11 911 302 317 01 Stop 3rd/4th Gear (2, One for third and one for fourth)
12 930 302 303 00 Synchroniser Ring (Syncro) (Need 2, One for third & one for fourth)
17 911 302 411 20 Shift Sleeve 3rd to 4th (Slider) (Need 1, One Shift Sleeve for 3rd/4th )

Drive Shaft
930 302 451 00 Collar Nut, 30mm, Drive Shaft

Pinion Shaft
930 302 453 00 Collar Nut, 36mm, Pinion shaft

Transmission Case Gaskets & Seal
21 930 301 191 00 Gear Housing to Trans Case Gasket
26 999 113 185 40 Transmission Cover, Shaft Sealing Ring
(35) 930 301 351 00 Trans Cover to Gear Housing Gasket
09 915 303 225 00 Inspection Cover Gasket

Tools
Synchro Hub Removal Tool 930 1st & 2nd P224
Synchro Hub Removal Tool 930 3rd & 4th P223

Last edited by 356911930; 07-07-2018 at 07:51 PM..
Old 07-07-2018, 03:13 PM
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Hummm….what about adding a few bearings here and there...just saying :}

Porsche and even Pelican bearings can get real pricey, real fast.

When I did my box, I took it all apart, took all the bearings to my local bearing house so they could cross reference the bearing #'s.

I was able to get all but 1 bearing sourced through them, same brands, same part numbers, for hundreds upon hundreds cheaper. One of the bearings was a Porsche proprietary item, so no getting around the big bucks for that single bearing.

Mark
Old 07-08-2018, 06:23 PM
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Hi Mark,

Thanks for the reply! That is a good point. I inspected the bearings and they all seem tight and look "like" new so hoping not to replace those as this is a spare transmission and my first tranny rebuild. But I am open to the idea if necessary.


I am putting together some photos of first gear parts for review.


Rahl
Old 07-08-2018, 08:35 PM
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https://forums.pelicanparts.com/911-930-turbo-super-charging-forum/790492-1st-engine-drop-tranny-rebuild.html
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Old 07-08-2018, 09:55 PM
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I have narrowed down the parts list for this transmission. I think that the later Asymmetrical First Gear Syncro Hun (dogteeth) and the Asymmetrical Shift Sleeve (Slider) are probably the best way to go.


So now I have:

1st Gear 1977 930/33 Transmission
??Need part # Synchro Hub 1st Gear(Dogteeth)(Need 1) Asymmetrical 930/33
(38) 930 302 316 00 Stone 1st Gear 930/33 1977 Trans 930/33
41 930 302 301 00 Synchroniser Ring 1st Gear(Syncro)(Need 1) 1976 Trans 930/30
(45) 930 302 411 01 Shift Sleeve 1st to 2nd (Slider) Asymmetrical 1977 Trans 930/33
47 928 302 319 08 Double Barricade Tape 1st Gear(Brake Band) 1976 Trans 930/30
47/1 928 302 320 01 Stop 1st Gear Replacement not needed 1976 Trans 930/30

2nd Gear 1977 930/33 Transmission
930 302 242 00 Synchro Hub 2nd Gear (Dogteeth)(Need 1)
38 930 302 315 00 Stone 1st/2 Gear Need only 1 as 1st Gear gets#(38) 1976 Trans 930/30
(39) 928 302 318 02 Double Barricade Tape 1st Gear 1976 Trans 930/30
(40) 928 302 322 00 Stop 2nd Gear 1977 Trans 930/33
41 930 302 301 00 Synchroniser Ring 2nd Gear Symmetrical 1976 Trans 930/30
(45) 930 302 411 01 Shift Sleeve 1st to 2nd Asymmetrical 1977 Trans 930/33

3rd and 4th Gear
930 302 243 00 Synchro Hub 3rd & 4th(Dogteeth) (Need 1) Only need 1 for fourth) Pelican parts # 101550 319 M157 for 1978-79 MY
09 930 302 325 00 Stone 3rd/4th Gear (Need 2, One for third and one for fourth)
10 911 302 316 00 Brake Band 3rd/4th (Need 4, Two for third and two for fourth)
11 911 302 317 01 Stop 3rd/4th Gear (2, One for third and one for fourth)
12 930 302 303 00 Synchroniser Ring (Syncro) (Need 2, One for third & one for fourth)
17 911 302 411 20 Shift Sleeve 3rd to 4th (Slider) (Need 1, One Shift Sleeve for 3rd/4th )

Drive Shaft
930 302 451 00 Collar Nut, 30mm, Drive Shaft

Pinion Shaft
930 302 453 00 Collar Nut, 36mm, Pinion shaft

Transmission Case Gaskets & Seal
21 930 301 191 00 Gear Housing to Trans Case Gasket
26 999 113 185 40 Transmission Cover, Shaft Sealing Ring
(35) 930 301 351 00 Trans Cover to Gear Housing Gasket
09 915 303 225 00 Inspection Cover Gasket


I still need the part number for the Synchro Hub 1st Gear(Dogteeth) Asymmetrical 930/33 and later. Anyone have this part number handy?


I will continue to reduce the parts list probably eliminating most of the Stops and Stones as they do not really look like wear parts.

First Gear and associated parts. The Syncro hub seems to show Hooked teeth. So this will need replacing with the Asymmetrical Syncro Hub.









The Double Barricade Tape 1st Gear. Same as two piece Brake Band for third and fourth but different design. I assume this should be replaced with new.




Stone First Gear. Very light circumferential scratched on O.D. Does not need to be replaced.



Stone First gear, Double Barricade Tape 1st Gear and Synchro Ring 1st Gear. Synchro ring has heavy wear on the two open ends and very little wear around the circumference. Seems odd...anyone see this before?










2nd 3rd and 4th gears to be disassembled and inspected in the next few days/weeks.


Rahl

Last edited by 356911930; 07-09-2018 at 08:33 PM..
Old 07-09-2018, 08:10 PM
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930.302.411.02 asym 1-2 shift sleeve
930.302.241.02 asym 1st fear teeth
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Old 07-13-2018, 06:00 AM
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Thanks Matt! Always appreciate your help and advise.

Rahl
Old 07-13-2018, 07:56 PM
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Thanks to Matt Monson I have most of the parts list put together. Evaluating the parts for wear and whether any of them actually need to be replaced is where I'm trying to gain more information. I plan on replacing all of the Synchroniser rings and the brake bands, probably 1st gear Sychro hub (Dogteeth), 1st to 2nd Shift Sleeve (Slider), 3rd to 4th Shift Sleeve (Slider) and maybe 4th Gear Synchro Hub (Dogteeth).

POS Part Number Description

1st Gear 1977 930/33 Transmission
930.302.241.02 Synchro Hub 1st Gear(Dogteeth)(Need 1) Asymmetrical 930/33
38 930 302 315 00 Stone 1st / 2nd Gear 930/30 ??????
(38) 930 302 316 00 Stone 1st Gear 930/33 1977 Trans 930/33 ??????
41 930 302 301 00 Synchroniser Ring 1st Gear(Syncro)(Need 1 for 1st Gear) 1976 Trans 930/30
(45) 930 302 411 02 Shift Sleeve 1st to 2nd (Slider) Asymmetrical 1977 Trans 930/33
47 928 302 319 08 Double Barricade Tape 1st Gear(Brake Band) 1976 Trans 930/30

2nd Gear 1977 930/33 Transmission
930 302 242 00 Synchro Hub 2nd Gear (Dogteeth)(Need 1)
38 930 302 315 00 Stone 1st/2 Gear Need only 1 as 1st Gear gets#(38) 1976 Trans 930/30
(39) 928 302 318 02 Double Barricade Tape 1st Gear 1976 Trans 930/30
(40) 928 302 322 00 Stop 2nd Gear 1977 Trans 930/33
41 930 302 301 00 Synchroniser Ring 2nd Gear ( Need 1 for 2nd Gear) 1976 Trans 930/30

3rd and 4th Gear
930 302 243 00 Synchro Hub 3rd & 4th(Dogteeth) (Need 1) Only need 1 for fourth) Pelican parts # 101550 319 M157 for 1978-79 MY
10 911 302 316 00 Brake Band 3rd/4th (Need 4, Two for third and two for fourth)
12 930 302 303 00 Synchroniser Ring (Syncro) (Need 2, One for third & one for fourth)
17 911 302 411 20 Shift Sleeve 3rd to 4th (Slider) (Need 1, One Shift Sleeve for 3rd/4th )

Drive Shaft
28 930 302 451 00 Collar Nut, 30mm, Drive Shaft

Pinion Shaft
53 930 302 453 00 Collar Nut, 36mm, Pinion shaft

Transmission Case Gaskets & Seal
21 930 301 191 00 Gear Housing to Trans Case Gasket
26 999 113 185 40 Transmission Cover, Shaft Sealing Ring
(35) 930 301 351 00 Trans Cover to Gear Housing Gasket
09 915 303 225 00 Inspection Cover Gasket


One more question. Is the new part number for the 1st Gear Stone due to the revised Asymmetrical Synchro Hub (Dogteeth) and Asymmetrical Shift Sleeve (Slider) ?

38 930 302 315 00 Stone 1st / 2nd Gear 930/30 ??????
(38) 930 302 316 00 Stone 1st Gear 930/33 1977 Trans 930/33 ??????




Rahl

Last edited by 356911930; 07-14-2018 at 02:29 PM..
Old 07-13-2018, 09:04 PM
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930 Transmissin Disassembly

Thought I would include the disassembly procedure of this 930 Transmission. From what I have read and now started to experience, the 4speed transmission "rebuild" is not that difficult. This is not a full rebuild, which would add some complexity, but this should be enough of a rebuild to produce a smooth shifting reliable transmission for years to come. I purchased this transmission used so I do not know all that may or may not be wrong with it. After inspecting the parts I have access to it looks to be in pretty good condition. My original goal was to change 2nd and 3rd gears to get more of an even RPM drop between gears and then the while you are in there stuff.


Step #1; 930 Transmission cleaned and degreased, ready for disassembly.



Step #2; Remove Transmission Cover



Step#3; Transmission Cover Removed



Step#4; Transmission Cover inside view showing reverse gear.



Step#5; Reverse Gear removed from Transmission Cover



Step#6; Removing Collar Nut from Pinion Shaft



Step#7; Pinion Shaft Collar Nut removed



Step #8; Using Reverse Gear to lock Pinion Shaft and Drive Shaft while in 4th Gear "similar" to what is described in the Workshop Manual. Placing Reverse Gear on one side to remove Pinion Shaft Collar Nut then moving the Reverse Gear to the other side to remove the Drive Shaft Collar Nut



Step 8a; Pinion Shaft Collar Nut and Reverse Gear removed



Step 9; Drive Shaft Collar Nut removed

Last edited by 356911930; 07-15-2018 at 08:53 PM..
Old 07-15-2018, 02:19 PM
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Step #11; Remove Gear Housing nuts. There are 10 nuts, the last one is always trying to hide from you.




Step #12; Setting Transmission on end to remove Detents and Shift Fork Cover




Step #13; Detent and Shift Fork Cover removed




Step #14; Gear Housing removed




Step# 15; Another view of the Gear Housing removed




Step#16; View of Shift Forks and Selector Rods




Step#17; Using puller to remove Gear together with Bearing




Step #18; Using puller to remove Gear together with Bearing form Pinion Shaft




Step # 19; Pinion Shaft Gear Stack from L-R 1st Gear, 2nd Gear, 3rd Gear, 4th Gear. It is important to keep the orientation of the gears as the come off of the shafts so that none of the parts get flipped over (upside down). I marked most with a black felt pen on the "top" side. Some transmission rebuild threads on Pelican parts indicate that this is critical especially with the cage bearings, which may be true, but I think that when they pressed on the new Syncro Hubs (Dogteeth) on the gears they did not have the I.D. of the gear checked, and honed if necessary, which may have lead to the failures.




Step #20; As you take the parts off of the Pinion Shaft and the Drive Shaft you can also put them on a piece of conduit or dowel to keep them in position and oriented correctly.




I will be disassembling more gears and inspecting them along with some of the other parts. Still trying to figure out if any of the parts are good enough to reuse as opposed to just replacing everything. I expect 4th Gear Synchroniser Ring and Synchro Hub (Dogteeth) will be the big question.

Rahl
Old 07-15-2018, 09:41 PM
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Nice write up. Thanks for taking us along for the ride.
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Old 07-16-2018, 08:07 AM
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Now for 2nd, 3rd and 4th gears disassembly and inspection!


2nd Gear, Snap Ring and Lockwasher removed. Synchroniser Ring rotated clockwise to stop. This shows how the right hand side Brake Band is forced outward to push on the Synchroniser Ring increasing the stiffness of the Synchroniser Ring



2nd Gear, Snap Ring and Lockwasher removed. Synchroniser Ring rotated counterclockwise to stop. This shows how the left hand side Brake Band is forced outward to push on the Synchroniser Ring increasing the stiffness of the Synchroniser Ring






2nd Gear, Snap Ring, Lockwasher, Synchroniser Ring, Brake Bands, Stone and Stop removed.





2nd Gear Synchroniser Ring showing some wear





2nd Gear Synchroniser Ring another view showing wear





2nd Gear, Synchro Hub (Dogteeth) showing "hooked" Teeth profile





2nd Gear, Synchro Hub (Dogteeth) another view showing "hooked" Teeth profile



Looks like I will need to replace the Synchroniser Ring, Synchro Hub (Dogteeth) and the Brake Bands. Replacing all the Brake bands was recommended by John Walker. I do not know the absolute necessity but they are inexpensive so I will probably replace them.


Rahl

Last edited by 356911930; 07-22-2018 at 05:14 PM..
Old 07-22-2018, 03:07 PM
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3rd Gear disassembly and inspection!


930 3rd Gear, Circlip and Lock Washer removed. Synchroniser Ring rotated to counterclockwise position.





930 3rd Gear, Circlip and Lockwasher removed. Synchroniser Ring again rotated countercolckwise.



Rahl




930 3rd Gear, Circlip and Lockwasher removed. Synchroniser Ring rotated colckwise.





930 3rd Gear, Brake Bands, Stop and Stone.





930 3rd Gear, Synchro Hub (Dogteeth) showing hooked teeth.





930 3rd Gear, Synchroniser Ring showing wear at end.





930 3rd Gear, Synchroniser Ring showing wear.





930 3rd Gear, Synchroniser Ring showing wear and hooked teeth on Synchro Hub (Dogteeth).



3rd Gear will need new Synchroniser Ring, Synchro Hub (Dogteeth), and Brake Bands.

Last edited by 356911930; 07-22-2018 at 05:13 PM..
Old 07-22-2018, 04:51 PM
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The 930 4th Gear is mostly identical to 3rd Gear. I have included the Shift Sleeve (Slider) for 3rd to 4th. Here is the disassembly and inspection.



930 4th Gear, Circlip removed.





930 4th Gear, Circlip and Lock Washer removed.





930 4th Gear, Synchroniser Ring showing minimal wear.





930 4th Gear, Synchroniser Ring showing minimal wear. Might replace anyway.





930 4th Gear, Synchroniser Ring shown rotated colckwise.





930 3rd to 4th Shift Sleeve (Slider). This view is the 3rd Gear engagement side, looks pretty worn, rounded teeth.





930 3rd to 4th Shift Sleeve (Slider). This view is the 3rd Gear engagement side, looks pretty worn, rounded teeth. I will replace this Shift Sleeve (Slider)





930 3rd to 4th Shift Sleeve (Slider). This view is the 4th Gear engagement side, very minimal wear. Will replace due to 3rd Gear engagement side being worn.





930 3rd to 4th Shift Sleeve (Slider). This view is the 4th Gear engagement side, very minimal wear. Will replace due to 3rd Gear engagement side being worn.




So for 4th Gear I will probably reuse the Synchroniser Ring, Synchro Hub (Dogteeth) but replace the Brake Bands and the 3rd to 4th Shift Sleeve (Slider).


Rahl
Old 07-22-2018, 05:12 PM
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I'd replace both synchro ring and a slider together as a set. Brake band and its stop and lock are rarely replaced and yours seem to look fine.

Good idea changing 2nd and 3rd gear ratios from stock...I did the same thing.
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Old 07-22-2018, 05:36 PM
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Mike, good point. I assume you mean the 4th gear Synchro ring should be replaced even though it is not showing much wear?

As I stated above John Walker has stated that all the brake bands should be replaced during a rebuild. I have noticed some odd wear patterns especially on the first gear synchro ring where it wore at the very end and not much around the rest of the O.D.

If I'm going with a new 3rd to 4th Slider do you think I should also replace the synchro Hub (Dogteeth) for 4th gear?


Rahl
Old 07-22-2018, 07:05 PM
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I can't tell from the photo on the condition of 4th gear dogteeth but if there's no wear then I'd leave it alone.
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Old 07-23-2018, 04:31 PM
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Here are some better shots of 4th Gear Synchro Hub (Dogteeth). They look pretty good and I will probably not replace it.


930 4th Gear Synchro Hub (Dogteeth). Nice shape no hook or much wear.





930 4th Gear Synchro Hub (Dogteeth) Profile of teeth looks good






930 4th Gear Synchro Hub (Dogteeth) Top View shows little wear, nice straight edges and flat tops on teeth.





Rahl
Old 07-24-2018, 08:04 PM
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I am replacing all the worn parts on my parts list with Porsche factory parts. Pelican parts has most in stock but even after checking three large suppliers I am having trouble sourcing Porsche factory parts for the following:

930 302 241 02 Synchro Hub (Dogteeth) 1st Gear Asymmetrical

930 302 411 02 Shift Sleeve (Slider) 1st to 2nd Asymmetrical

930 302 303 00 Synchroniser Ring (Synchro)

Any help locating these factory parts is appreciated!

Thanks,

Rahl
Old 07-29-2018, 01:55 PM
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So it looks like Porsche no longer makes the 1 st gear Synchro Hub (Dogteeth) or 1st gear. Porsche does still supply these two parts.

930 302 411 02 Shift Sleeve (Slider) 1st to 2nd Asymmetrical

930 302 303 00 Synchroniser Ring (Synchro)

I will need to find out which supplier has the best quality 1st Gear Synchro Hubs (Dogteeth). Any recommendations would be appreciated.

Thanks,

Rahl
Old 07-31-2018, 06:03 PM
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