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Transmission Main Drive Input Shaft Gear (4-134)
Fits 46-71 Jeep & Willys with T-90 Transmission

Part # 640428

New Transmission Main Drive Gear (1 required per vehicle)

The gear has a tooth count of 30-18 which is from front to back and a spline count of 10.

T-90 Transmission with 4-134 engine

46-49 CJ-2A
49-53 CJ-3A
53-64 CJ-3B
55-71 CJ-5
50-52 M38
52-66 M38A1
46-53 Truck
46-53 Station Wagon

Part # Price





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Questions & Answers

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How much is the shipping cost to Tokyo, Japan for this one?

Willys Jeep Parts Tech:
Please email your full shipping address and we can quote you out.

i have a 1947 cj2a willys jeep, it calls for a cj2a1 transmission is the cj3a trans the same

Willys Jeep Parts Tech:
CJ 2A and CJ 3A use the same transmission.

Hi, I´m from Argentina. I will be traveling to US during October. I have a M38a1, is this the right part? I think that i have a T90 transmission. Thanks for your support.

Willys Jeep Parts Tech:
Yes it would be correct.

Do you have this part for a Borg Warner T15 transmission? 10 spline/20 tooth.

Willys Jeep Parts Tech:
Please email your vehicle information and we can help out. Thanks!

what is the outside dia. of the spline?

Willys Jeep Parts Tech:

Do you have the pilot bearing and price

Willys Jeep Parts Tech:
639578 is the part number on our site.

Do you have this part with 16 teeth ?

Willys Jeep Parts Tech:
Yes we do. The part number you're looking for is 643246. Thanks

is this axle with 16 or 18 teeth?

Willys Jeep Parts Tech:
18 tooth

I have a guy finishing a T-90, my original guy is back in jail. However, everything is together, but now the main input shaft won't spin. Everything spins on its own.until the output shaft is bolted back in. Even with the transmission in neutral. Any ideas what we did incorrectly?

Willys Jeep Parts Tech:
Sounds like you may have dropped a roller bearing. I would check that. Also when first assembled they are very tight and hard to turn over by hand due to the front seal.

I'm looking for the input shaft that I 7 inches long and 15/16th do you have this one?

Willys Jeep Parts Tech:
Please call us toll free so we can get more vehicle information and help you out.

what is the overall lenght on this drive gear ?

Willys Tech:
They are 9-1/16 like original.

My current one has 18 teeth, how many does this one have? (58 cj3b-f134)

Willys Tech:
This will be the proper one for all T90 transmissions.

mike,can the main drive gear (T90) (4-134) fit the MB jeep that i have? or better still, will the entire T90 transmission assembly fit the MB engine that I have? or does it require certain modifications to allow entire T90 asembly fit. the spline of the T90 fit? thanks

Willys Tech:
You have a T-84 transmission in that 41-45 MB. A T90 will fit but you will have to cut out your floor board alittle to accomodate the taller top shifter.

is this main drive gear for a t90a or a t90c or do you have it for both?

Willys Tech:
T90A. Really just match to your motor.
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