902/1 transmission identification

[randykyra]

I was looking over my 1968 912 and was trying to identify the drivetran. The motor and vehicle vin seem to fall in line with the year but the numbers on the trans are stumping me. What I found was 902/1 and 229199 on the bottom of the transmission. I've looked on the internet and from the website i found I can't even find a 902/1 trans with number close to what I found. Can anyone identify this transmission? Is it the right one for the car? Or is it out of something else?

Thanks

[Jaems]

902/1 is a 5 speed transaxle. It was mainly for a 911. However, it was also used as a USA 912 transaxle, before Nov 68, after Nov 68 it was902/14.

Your serial number for that transaxle is as follows:

229199.
2= 6 cylinder 110 HP
2= 5 speed
9= 1969
199 = sequential numbering.

For a 68 912 it should of been: 128xxx for a 5 speed. 108xxx for a 4speed.

[randykyra]

Thanks! That's a big help....

The 902/1 transmission was used for the 911 and the 912 as Jaems wrote. As far as I know - perhaps Jaems could confirm this - the gear ratios for the same type transmission used in the 911 and 912 differ for 4th and 5th, caused by the difference in power//torque between the 911 and 912 engine.

A 911 902/1 box will therefore (theoretically) result in a slightly bit different performance in a 912, compared to the original 902/1 912-version of the transmission.

Otto

[randykyra]

Jon b just posted this on the 912 side. I'm getting confused now....

Quote:
Originally Posted by randykyra View Post
Got my answer in the 912 section.

902/1 is a 5 speed transaxle. It was mainly for a 911. However, it was also used as a USA 912 transaxle.

Your serial number for that transaxle is as follows:

229199.
2= 6 cylinder 110 HP
2= 5 speed
9= 1969
199 = sequential numbering.

Other words your transaxle was meant for a very early1969 911T - originally. For a 912 it should of been: 128xxx.

This answer is not correct.
A 1969 transmission would have a 7-digit serial number, not a 6-digit number.

Your transmission is a 1966 5-speed.

Porsche did not document the 66 transmissions well, and made no distinction between a 902/1 for a 4-cylinder or 6-cylinder car.
This has been discussed several times on the Early 911S Registry forum.
__________________
Jon B.
Vista, CA

[WFBowen]

901 Series Porsche Transmission

Good source of info.
Bill

[randykyra]

Originally Posted by WFBowen

901 Series Porsche Transmission

Good source of info.
Bill

Yep, good source. Looked at it the other night. unfortunately my serial number isn't on the chart. That's why I posted the question, What's it out of and what year... I've gotten two different answers so I'm kind of still in the same place. hopefully someone with more knowledge then me can give me guidance.
Thanks again everyone. Keep it coming...

[Jaems]

The Kardex would tell you if the serial # was for your 68 originally. The transaxle may have been changed from a 4 speed to a earlier 5.

However, all 68 912 had a beginning serial # of either a 108 for a 4 speed, a 118 for a 4 speed sportomatic, or a 128 for a 5 speed.

The gearing was the same for the very early 911, 911T and the 912 5 speeds. The change was for the later 66 911 and then the 67 911S.

[djdsc]

There has been some really good and some really bad info posted in this thread.

Hint:

The early transmission numbers were 6 digit

The '68/'69 numbers were 7 digit.

Don't get confused by the BS.

[randykyra]

I guess what I'm hearing is that it's a 67 or before because it's a 6 digit serial number? But because it's an early transaxle and porsche didn't keep good records on those I won't know for sure what year and what it came out of?
Does that sum it up?

[Peter Graham]

912 Registry Technical Data - Transmission data is near bottom of the page.

Peter

[69porsche]

Originally Posted by Peter Graham

912 Registry Technical Data - Transmission data is near bottom of the page.

Peter

+ 1, ...When in doubt go to the official source! Good intentions by everyone but no substitute for the facts!

[randykyra]

Originally Posted by 69porsche

+ 1, ...When in doubt go to the official source! Good intentions by everyone but no substitute for the facts!

I understand but my serial number isn't listed there either.

[69porsche]

Originally Posted by randykyra

I understand but my serial number isn't listed there either.

Possible that you transposed the numbers, do you have a photo?

[randykyra]

Originally Posted by 69porsche

Possible that you transposed the numbers, do you have a photo?

Here are the pic's.

[JT912]

From an early specs book. Looks like your number is from an early 911 or 912. Before they went to separate numbers for each line.

[dmaddox]

Apologies for digging up an old thread, but I have the same question - and it doesn't appear this thread was ever solved.

I have a 902/1, serial is 223397. (I have a 10/67 build date 1968 USA 911L). My kardex indicates (as well as COA) that the number should be 3280571.

I assume this is the correct location for the number? I can't find or identify this transmission's number in any documentation. It doesn't fit in any range.

[JT912]

That is the transmission number you show. A #3280571 would be correct for a ‘68 which is what the Kardex also lists.

[dmaddox]

Right, but where would "3280571" be stamped? 223397 is on the bottom of my current transmission. My kardex states 3280571. I apologize if I am misunderstanding.

[JT912]

It would be stamped in the same location the stamp you show. Your current transmission is not the one that originally came with your car.