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Garage Queen
 
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Transmission wish list

Gents,

It is time for my car to have the transmission rebuilt. It started with 2nd gear and now 3rd gear is hard to engage. I have been fighting with it for sometime, maybe 6 months, but today I felt 3rd gear was never going to happen.

I want to do this right, so I am looking for some advice. I have read older thread, but I'm looking for some newer advice.

My driving habits are highway use. I don't track the car and do not need to exceed crazy top end speeds. I enjoy the turbo from 2nd to 3rd gear now. I rarely make it to 4th and 1st is only good to get to 2nd.

What would be your wish list for a transmission rebuild of my car?
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Stephanie
My minions:'86 911 Targa 3.4, '87 930, '05 Lotus Elise,
'18 Macan S, '13 Focus ST, '16 Focus RS
Old 08-30-2011, 03:22 PM
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I just had the 3rd gear synchro done for a bit over $1500. I pulled the trans and dropped it off at the shop.
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87 carmine red 930 | 57k | B6 modified IC | GHL headers | custom exhaust | VEMS EFI | carrera intake w/ flipped TB | LS2 coils | EBC | K27-7200 (soon to be replaced by GTX3071
Old 08-30-2011, 04:13 PM
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Quote:
Originally Posted by fletcher0780 View Post
I just had the 3rd gear synchro done for a bit over $1500. I pulled the trans and dropped it off at the shop.
$1500 for one gear? I should put my skills to work... lol.
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Old 08-30-2011, 04:40 PM
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Quote:
Originally Posted by fletcher0780 View Post
I just had the 3rd gear synchro done for a bit over $1500. I pulled the trans and dropped it off at the shop.
I'm thinking this will go over $1500. I want to fix any problems and perhaps make some improvements in how it drives and how I drive it.
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Stephanie
My minions:'86 911 Targa 3.4, '87 930, '05 Lotus Elise,
'18 Macan S, '13 Focus ST, '16 Focus RS
Old 08-30-2011, 04:42 PM
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Quote:
Originally Posted by DSPTurtle View Post
$1500 for one gear? I should put my skills to work... lol.
parts were $900
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87 carmine red 930 | 57k | B6 modified IC | GHL headers | custom exhaust | VEMS EFI | carrera intake w/ flipped TB | LS2 coils | EBC | K27-7200 (soon to be replaced by GTX3071
Old 08-30-2011, 04:48 PM
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The 930 box is slow by design. You can replace all the dog teeth and all of the brake bands and still end up with a slow shifting transmission. I did all the parts on my slope and the parts bill was around $2k. I did the labor myself. I replaced the dog teeth on 3rd and 4th in my other gearbox and that was still around five bills for two parts. There was a great post a few years back describing the design factors that contribute to the slow shifting nature of our gearbox. Something to do with the dog teeth and the brake band stops. I will see if I can dig it up and post a link.
I have no idea what a shortened G50 costs but that seems to be the only way to really improve the speed of shifts.
But then again... I may get corrected before I have a chance to find the primary source.
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Old 08-30-2011, 05:06 PM
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I'd go with an 8:39 r&p, you'll use 4th again, and lsd.
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Old 08-30-2011, 05:06 PM
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Quote:
Originally Posted by DSPTurtle View Post
I will see if I can dig it up and post a link.
I have no idea what a shortened G50 costs but that seems to be the only way to really improve the speed of shifts.
But then again... I may get corrected before I have a chance to find the primary source.
I didn't see that link in a search, but would like to read it.

Quote:
Originally Posted by gumba View Post
I'd go with an 8:39 r&p, you'll use 4th again, and lsd.

Gumba, I did find in previous post changing the r&p. I'm thinking this is a good choice.

Overall, if I can find a G50, would that be the best path?
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My minions:'86 911 Targa 3.4, '87 930, '05 Lotus Elise,
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Old 08-30-2011, 05:19 PM
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The R&P change to the 8:41 or 8:39 will make it similar to a 5 spd but no 5th gear. Top end is around 150mph in 4th, so a little higher than the 135 mph in 3rd that you get now and 75 mph cruise is around 3300 rpm. These motors like RPM to stay running clean so what's not to like unless on the autobhan or similar road. Cost wise it is minimal if you are rebuilding the Trans otherwise. I would guess it would overall cost about half $$$ amount while still maintaining your originality . Many of these transaxles that were upgraded to lower R&P were changed in the late 70s early 80s were made by great tuners such as Andial /Alan Johnson/ Kremer etc, what more can i say except I have these cars and they are really fun compared to the higher R&P cars. Mooney just replaced his lower top end speed ( 155 mph ) with a stock R&P ( 195 MPH) from my extra parts bin and mentioned he would part ihis 8:41 for around $500., not too long ago.
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Old 08-30-2011, 05:31 PM
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930 gearbox rebuild

P-gal, the Andial 8:39 ring and pinion is prolly unobtainable anymore, but if you want your gearbox done by a pro call Mike Bruns at JB Racing cuz that's who did mine and HE KNOWS THEM LIKE THE BACK OF HIS HAND

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FS 1987 930 DTAFast EFI w/Electronic Dash, 17x9x11" Lindsey Racing Fuchs, Andial 8.39 R&P, C2 Intake, SuperCup Cams, Flame Ringed Heads & Cylinders, TurboKraft Full Bay Intercooler, RearlyL8 Twin Scroll Headers, Big Bullseye Twin Scroll Turbo...SOLD
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Old 08-30-2011, 05:39 PM
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8:39

I also have been thinking about going this route. Can anyone else chime in with there driving experience with this gear ratio. I have purchased a rebuilt gearbox to go with a HP build I will be installing this winter. Any opinions about this ratio with a HP build? Philip
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Old 08-31-2011, 04:36 AM
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It's been years since I've seen an Andial 8:39 R/P set. However, we have recently manufactured 8:41 sets for the 930 gearbox. Mike Bruns or any Guard dealer could acquire and install one for you. Since you are in South Carolina, you might want to talk to Gordon at Autometrics. His guys can do the box for you.

Regards,

Matt Monson
Guard Transmission llc
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Old 08-31-2011, 08:39 AM
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Quote:
Originally Posted by Matt Monson View Post
It's been years since I've seen an Andial 8:39 R/P set. However, we have recently manufactured 8:41 sets for the 930 gearbox. Mike Bruns or any Guard dealer could acquire and install one for you. Since you are in South Carolina, you might want to talk to Gordon at Autometrics. His guys can do the box for you.

Regards,

Matt Monson
Guard Transmission llc
Matt, about what are those 8:41 R&Ps going for?

I think the Andials sold for $1200 years ago...
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FS 1987 930 DTAFast EFI w/Electronic Dash, 17x9x11" Lindsey Racing Fuchs, Andial 8.39 R&P, C2 Intake, SuperCup Cams, Flame Ringed Heads & Cylinders, TurboKraft Full Bay Intercooler, RearlyL8 Twin Scroll Headers, Big Bullseye Twin Scroll Turbo...SOLD
1999 Harley Davidson Custom 1250 Hardtail Bobber..SOLD
2014 BMW X6M, 2012 BMW 128i, 2014 GMC Sierra, 2015 Cobia 237 Center Console 300hp Yamaha
Old 08-31-2011, 08:43 AM
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Quote:
Originally Posted by CaptainCalf View Post
Matt, about what are those 8:41 R&Ps going for?

I think the Andials sold for $1200 years ago...
The last Andial I sold about 4 years ago went for $4000. Our new ones go for $3000.
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Old 08-31-2011, 08:49 AM
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Quote:
Originally Posted by Matt Monson View Post
The last Andial I sold about 4 years ago went for $4000. Our new ones go for $3000.
WoW

Adding one must make a nicely refreshed 930 gear box worth $10K!
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FS 1987 930 DTAFast EFI w/Electronic Dash, 17x9x11" Lindsey Racing Fuchs, Andial 8.39 R&P, C2 Intake, SuperCup Cams, Flame Ringed Heads & Cylinders, TurboKraft Full Bay Intercooler, RearlyL8 Twin Scroll Headers, Big Bullseye Twin Scroll Turbo...SOLD
1999 Harley Davidson Custom 1250 Hardtail Bobber..SOLD
2014 BMW X6M, 2012 BMW 128i, 2014 GMC Sierra, 2015 Cobia 237 Center Console 300hp Yamaha
Old 08-31-2011, 08:54 AM
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Has anyone changed the ratios for 1st and 2nd gear for better acceleration but not sacrificing top end or highway cruising by going with 8.41 R&P?
Old 08-31-2011, 11:24 AM
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Quote:
Originally Posted by drmatera View Post
Has anyone changed the ratios for 1st and 2nd gear for better acceleration but not sacrificing top end or highway cruising by going with 8.41 R&P?
Just change the gear sets and not the R&P? Yes, this is what we usually recommend.
I think the 8:39 is fun, but they are really rare and a lot of hours to install.
IMO, the 8:41 is not good on a typically modified, more powerful 930. 1st is then so short as to be useless, 2nd is low enough to pull away from a stop. I think it turns the long ratio 4-speed into a 3-speed.

PorscheGAL -- spoke with your husband last week about performance mods for the 4-speed and this is what I recommended to him: if you want to make changes for performance, change the gears only, and use genuine Porsche gears. Change the ratios to suit your driving and powerband.
If you like 4th for a highway cruising gear, keep it as is.
Want 1st just a little shorter, like a 8:39 would do for your 4-speed? Change it. Then space 2nd and 3rd appropriately.
With the help of a gear chart, this is pretty easy to figure out. Call or email if you want to go over it.
Otherwise, if you're happy with the gearing of the 4-speed, leave it as-is and just fix the 2nd & 3rd gear synchros.
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Old 09-03-2011, 03:16 PM
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Quote:
Originally Posted by TurboKraft View Post

PorscheGAL -- spoke with your husband last week about performance mods for the 4-speed and this is what I recommended to him: if you want to make changes for performance, change the gears only, and use genuine Porsche gears. Change the ratios to suit your driving and powerband.
If you like 4th for a highway cruising gear, keep it as is.
Want 1st just a little shorter, like a 8:39 would do for your 4-speed? Change it. Then space 2nd and 3rd appropriately.
With the help of a gear chart, this is pretty easy to figure out. Call or email if you want to go over it.
Otherwise, if you're happy with the gearing of the 4-speed, leave it as-is and just fix the 2nd & 3rd gear synchros.
Chris, thanks for your input and my husband appreciated your honest opinion. We are going to stick with a stock setup. The examples of why to change the gear setup that you told my husband, made us think about what we wanted. Our previous reasons on changing were not based strongly enough on evidence. We have enjoyed the stock setup with a few exceptions. The few exceptions do not justify changing the setup.

Thanks.
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Old 09-05-2011, 05:33 PM
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gearhead
 
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Quote:
Originally Posted by TurboKraft View Post
IMO, the 8:41 is not good on a typically modified, more powerful 930. 1st is then so short as to be useless, 2nd is low enough to pull away from a stop.
Really? A 41mph 1st gear is useless? I'm going to guess that Porsche disagrees with that since the late 915 uses a 41mph 1st gear and the G50-01 uses a 40mph 1st gear. To each their own I guess...
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Old 09-06-2011, 09:07 AM
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It has to be better than an "A" gear with a 7:31...
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Old 09-06-2011, 09:28 AM
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