Anyone know what a 901/05 transmission would be?

dotorg · 09-04-2003, 06:53 AM

Yeah, what the subject says.

Just curious what info there is on what a 901/05 transmission would be. Google and searches here haven't turned up much.

ValveFloat · ValveFloat's Garage

I think thats a 67 S trans, but i'm wrong
Joe

jluetjen · jluetjen's Garage

Good Question. It's not in my spec book. 912's and some of the early 911's had 902 transaxles, and the 905's were the Sportomatic. But I can't find any mention of a 901/05. Do you have one?

Hmmm.

Warren???

dotorg · 09-04-2003, 10:16 AM

No, but I was talking to a guy who was selling one he said had that marked on it. I found one other reference to a 901/05 transmission, but no detail.

Trying to figure out if its worth picking up as a spare to rebuild.

Bobboloo · Bobboloo's Garage

What's the serial number?

dotorg · 09-04-2003, 10:51 AM

I think its 901 328 260 08, but I'm not sure. Might just be the last eight. What do they normally look like?

Early_S_Man · 09-04-2003, 01:18 PM

dotorg,

Recheck that type number, please?

Serial numbers for early transaxles were seven digits long, starting with 7 for six-cylinder applications, and 5 for four-cylinder applications ...

Third digit was for year, and last four digits were the sequential number.

Here are a few charts that may help. An extremely good reference for early 901, 902, 911, and 914 transaxles is found in the Clymer 912 Handbook ... it rivals the factory service manuals in completeness and accuracy, and many pics are factory-sourced!

dotorg · 09-04-2003, 01:26 PM

Thanks Warren,

I shot an e-mail back to the seller asking him if those are definitely numbers from the transmission. I don't have it in front of me, so I really have no idea. I'll post more info when I know.

Whats that five yellow stars that just showed up on this thread, by the way?

ValveFloat · ValveFloat's Garage

Oops, I guess it was 901/02 I was thinking of. But there is some info there I did not have, Thanks!

Rick Cabell · 09-04-2003, 04:06 PM

If this is 901/5 tranny, I would be interested in buying it. Any help in the direction of the seller, that would be great.

ValveFloat · ValveFloat's Garage

Ok, so now I know why 901/05 sounded familiar to me, because my 'L' has a 901/05, S/N 328 2479, probably not the original trans for my car. I have never been able to find anything on this transmission. It is an aluminum case, with really short ratios, simular to 902/50 in the above info.
If anyone can tell me anything about this trans, I'd be interested.
Joe

genevaforeign · genevaforeign's Garage

Old forum I know but can anyone shed more light on a 901/05 transmission? If it came in the L's, why are there not more of them out there? I don't see anything in the books regarding this trans. I have 3282260 currently. Any help would be appreciated

Thank you!

Matt Monson · 01-26-2017, 08:32 AM

The 901/05 is a special order gearbox, so it is geared to order. They usually contain a 904 mainshaft and special ratio gears. Many of them were also spec'd with an LSD.

djpateman · 01-27-2017, 04:34 AM

Matt, respectfully, I think you are writing of the 901/5x series of special transmissions.
The 901/05 is an aluminum cased 1968 transmission with A M F S X gear-set, and has a serial range from 3282001 to about 3283000; thus approximately 1000 were built. 1968 was a year where a lot of transmission variants were produced; I think Grady said 17. The 901/05 was a replacement for the 902/1 which is specced the same as the 901/05 with the lower serial range from 3280001 to about 3281500. I suspect the difference is in the diff type; I know there was the regular and simplified diff arrangements. Perhaps Matt could elaborate. For certain, the 902/1 was used on lower VIN's than the 901/05. Since this is an aluminum case, look for the casting date on the main case next to the diff side cover, and report it to me.

MBEngineering · 02-11-2017, 09:06 AM

HI genevaforeign

just for a bit of info, I have a 1968 Ally box (901/05) in the shop at the moment with the box No' 328 2284 , not to far away from your box, with a date casting of 16/69.

regards mike

Brakekiller · 06-20-2018, 01:19 AM

Greetings,

I do have an alu trans case stamped 901/05, with SN 3282539, BUT COA shows 901/54 type (Special Nurburgring) which correspond to the currently in the gearbox.
This is the original transmission from my 911L 1968 confirmed by the Kardex and COA.

Any clue ?

Cheers.
X

john walker's workshop · 07:52 AM

AA,F,M,S,X in the one I just went through, to help solve the mystery. It appears that they are a special order box with any ratios available.

MBEngineering · 02-01-2021, 01:08 AM

HI

pulled the box apart, 901/05, No' 328 2284 , the box looks original and has the ratios;

1st 11:34 A
2nd 18:34 F
3rd 22:29 M
4th 25:26 S
5th 28:24 X

with a 7:31 CWP

all date stamped with 68

hope this is some use to some one, as this box 901/05 dos' not seem to have any recorded info?

regards mike

djpateman · 02-01-2021, 11:21 AM

902/1 3280001 series, 3281317 is the highest I know.
continued on in the:
901/05 3282001 series, 3282991 is the highest I know.
There were several series of 902/1 all of which have ratios A F M S X. Coincidently 901/05 did too. That is why it is a continuation series. The difference between the two types is the differential. All 902/1 had the original differential, while the 901/05 had the simplified differential, enough reason for the type change. I have significant data on the 901/05; it is definitely a normal production box, not a special rations box; they are ALL in the 928xxxx set of series with types 901/5x or 7x and just maybe 9x. 901/8x was in 1969.