Transmission Question

T-90 mated to a F134 engine. new to me jeep, been fixing as I go, and when I went for a test run the other day, it kept popping out of 2nd gear. all internet searching pointed to a rebuild.

I have a perfectly fine T18 transmission. is this a bolt and go operation for the t90 replacement?
I have NEVER in my life rebuilt a transmission, nor do I have any desire to start.

 

Re the T-18, no. What vehicle is the T-18 out of? The Novak Guide to the Borg-Warner T18 & T19 Transmissions

Re the T-90, usually that's a worn-out 2nd gear that makes it come out of 2nd when decelerating.

 

yup. that's what I read as well. and I also read its one of the easiest to do, novak sells a rebuild kit, but I'm not really interested in going that route.

a jeep. I also have the inline 6 attached to it.

 

are there any trannys that will easily replace my t-90 that is currently attached to my 134 motor? this is a budget/project jeep, not looking for show quality or fancy adaptor purchases.

 

The only transmission that might be considered a "bolt-in" is a T-98 truck 4-speed from a so-equipped F134 CJ-5 ... but you'd need lots of factory parts to go along with the transmission ... transmission adapter, floor plates, transfer case adapter, drive shafts, speedometer cable (?), clutch linkage (?) ... just guessing at which other small bits might be needed. Sometimes they come up, but they are very scarce if not attached to a CJ-5, and not particularly plentiful when they are.

There's really no viable option to the T-90 that's not a full-on transmission swap. If you don't want to rebuild the transmission, you will have to pay someone to rebuild it for you. Herm has an exchange service. T-90 Transmissions | Herm The Overdrive Guy There must be others that do this, but I don't know of any.

What year Jeep is the T-18 from? Does it have a tag? What's the Jeep PN (likely 999xxx or 535xxxx or similar)?

 

I have one in my jeep, love to find one for the wife's. But alas...looks like a rebuild is on the way.

 

since a rebuild is in order, what is the harm in driving it till its DONE DONE?

 

Yeah, just hold it in gear. It'll be ok for a while.

 

Good to know. Just plan on beating around the trails at my house with it for the time being.

But let's talk time. I have zero kids, and other than my job I have more free time than I know what to do with most the time. Is this a weekend project? Week?

I can pick my nose pretty fast, but tranny removal, rebuild, install...seems daunting.

 

R&R is easy. Put the Jeep up on stands. Support the back of the engine with a jack and unbolt the driveshafts, tape around the caps and tie them out of the way. If you have a floor jack or transmission jack, remove the trans/TC/xmbr as a unit. Otherwise muscle down the cross member, then the transfer case, and the transmission.

Then clean everything, bring the transmission to the bench, and carefully disassemble. Note the location and orientation of each piece as it comes apart. An inexpensive engraver is handy for marking the parts so you don't mix up front and back. Measure the thickness and diameter of the snap rings as you take them off.

Usually you need a press or a puller to remove the front and rear main bearings.

 

FWIW, I'm running a T-18 behind an f-head, but it wasn't exactly an easy swap. Many custom parts that would have cost a fortune if I didn't do it myself.

If you're looking to throw money at it, IMO, the best (only?) kit out there is from Novak to put a Dodge NP435 behind the f-head. That's a GREAT transmission. But... the engine-to-trans kit alone is $550, then the trans-to-transfer case adapter is another $525, plus you'll still have to source a transmission and new/altered driveshafts.



Adapting the Willys Jeep L & F 134 Engines to the Dodge NP435 Transmission

 

The first transmission I ever rebuilt was a t-90. Just rebuild it. I did it in my backyard. It worked great. If you have questions we can help you. I used a Chilton manual to do it in 1995. You can too.

 

I expect the common Ford input is too short for the F134 input. Maybe the Dodge 435 input is longer?

Unless you want a big project, just fix the T-90. You'll get plenty of support from the forum. The T-90 is an easy shifter, and works well with the 134s.

 

Rebuild the Dana 18 since its out, new clutch, flywheel resurface since its out...project creep guys

 

How many miles are you going to put on this Jeep? If it is just an around town a couple miles a month then just drive it. Many times(especially on a T90)just putting a rebuild kit in doesn't fix any problems as some of the hard parts are just plain worn out. Be prepared to pull it apart and have to order parts to put it back together. Most shade tree mechanics simply don't know what to look for as the wear can be deceptively minimal and do the whole job just to find out that it is just a little quieter.