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Complete Transmission Overhaul Kit (4-134 engine)
Fits 46-71 Jeep & Willys with T-90 Transmission

Part # T90K

Complete Transmission Overhaul Kit

Everything you need to completely redo your entire transmission. Just keep your old case. Kit includes all New gears, shafts, bearings, gaskets, seals, synchronizer, snap rings, thrust washers, & roller bearings. The most complete kit available and highest quality parts guarantee.

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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What brand are these parts and where are they made?

Willys Jeep Parts Tech:
Just depends on the item. We build these kits up ourself using the best parts we can get for each item.

Does the front bearing retainer come with the neoprene seal or the felt seal?

Willys Jeep Parts Tech:
Upgraded neoprene

Could you sell this complete rebuild kit for the t90 but without the bearings?

Willys Jeep Parts Tech:
You would have to purchase the parts separately.

Does this kit include the front bearing retainer? I don’t see it in the pic or parts list.

Willys Jeep Parts Tech:
Yes, it is shown in the middle of the photo.

Can a 4 speed work with the 66 CJ5 buick 225 engine?

Willys Jeep Parts Tech:
Depends on what your putting in. Email to help.

I have a 1957 Willy's Jeep FC-150 with a 4-cyclinder engine and a for the rebuild3-speed on the column. I am assuming it is a T-90; how can i be sure? If it is do i need the T90K for the rebuild?

Willys Jeep Parts Tech:
It should be. But there are some differences with the column shift. Email to help.

Do you have the T90K in stock? Will this mate with Spicer D-18 small hole? Thank you

Willys Jeep Parts Tech:
Yes, we stock these kits. That is correct.

What is the number of teeth on the input shaft gear and the mating cluster gear for this kit? Is the input bearing sealed? Can it be ordered as a sealed bearing? Thanks Milo

Willys Jeep Parts Tech:
Give me a call toll free and we can help. You can ask for Mike M. We can swap it for you to what you need.

Will this kit work for a dauntless v6?

Willys Jeep Parts Tech:
As long as you have the T90 transmission yes.

Is it OK to use Mobil 1 synthetic gear lube for a T90. I know there is a problem with extreme pressure additives and the copper containing brass parts but the Mobil website says that Mobil 1 synthetic is compatible with copper. Can you clear up this confusion.

Willys Jeep Parts Tech:
We recommend non mineral, GL4 90 weight. A brand name to look for is Brad Penn 85/90. Thanks

I have a T86AA trans in a 1967 cj5. Can I rebuild it as a T90 with this kit? Its going with a V6 Buick motor.

Willys Jeep Parts Tech:
We should be able to help you with that T86. Please call us toll free and ask for Mike M.

Dose this kit have the oil collector with it that is held in place by two bolts to the front of the case

Willys Jeep Parts Tech:
The oil collector is available used only. Please call us toll free and we can try to help.

I have an m38a1 transmission locked in neutral- cannot get it to go in any gear. Have the top off the transmission- Question , the forks : large one will freely move left and right foreword and back- small fork will move left and right but not forward and back, is this the way it works or do I have a problem with the small fork ? Thanks

Willys Jeep Parts Tech:
Sounds like you have an issue with your small fork. Call us toll free and we can put you in touch with our transmission guy.

Will this up the speed on my jeep so I can go faster than 40 MPH or is there another transmission case?

Willys Jeep Parts Tech:
SATURN is an overdrive that would help you accomplish this.

I have an early 46 cj2a with three on the tree t-90a will this kit work to rebuild the transmission?

Willys Jeep Parts Tech:
Yes, this kit will work for you. Thanks!

What is the diameter of the main input shaft for my T90?? Also, it has 10 splines, correct?

Willys Jeep Parts Tech:
Approx 1.125 like original. Yes, they are 10 spline.

what is the weight of this kit, as i need to hand carry it by air

Willys Jeep Parts Tech:
These weigh approx. 45 pounds boxed.

I'm looking at purchasing a used T-90 for my Cj2a, but it has the longer main drive gear (shaft) for a V-6/V-8, and I am using an original F-134 engine. What parts would I need to buy to swap this out, other than the drive shaft itself? Also, would this require a complete tear-out/trans re-build or removal of the main shaft to do this?

Willys tech:
You probably need a main drive gear out of a 6-226 T90. Please call us toll free and we can help you out.

will this kit work for the L 6 226 in a 1957 willys pickup

Willys Tech:
You want part number: T90K-L

Does this kit include the parts to rebuild the cover (poppet balls and springs, forks)? The cover was different in military vehicles and CJ vehicles.

Willys Tech:
This is for the transmission only. It does not cover the top shifter.

I'm rebuilding a T90 for a 1953 M38A1, When I start adding up seterate parts it adds up. Will this Kit cover everything but the case and the cover/shifter?

Willys Tech:
Yes that is correct. It is a complete transmision assembly.

Does the complete transmision kit come with instructions?

Willys Tech:
We sell complete mechanics manuals. That is one of the first things you will want to get for you Willys. They go thru all the disassembly and assembly for the vehicle.

I know you are going to say rebuild, but i just would like to know why this t90 jumps out of second gear when decelerating at low speeds. This is the second trans, the first had a lot of water damage from seting but this one looked great. Replaced a few bearings and put everything back like came out. After 5 or6 hundred miles starting to jump out of gear. Whats not right or worn out?

Willys Tech:
It is your syncronizer assembly. Try part number: 640391

I have 1943 willys mb. Is it possible to use same engine the four cylinder and some how install and make it automatic with some type of adaptor between engine and transmission? or do i have to change engine or give me an idea maybe you have something i can use., to do the change over.

Willys Tech:
I would advise against this. You will destroy the value of the vehicle getting rid of the original T84 transmission.
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