F134 T98 conversion?

I didn't know there was a four speed transmission available for early CJ5s with a F134 and D18 transfer case? I read this article http://cj3b.info/Tech/T98A.html and I'm unsure if the drive shafts will have to be changed or will I be able to use the same ones? And will the transmission cross member and skid plate have to be changed out also?

 

I have just such a set up in my '62 CJ5 -- F134, T-98 and D-18. I can't answer any of the questions you ask, but I can verify that such a combination exists. Read my signature and you can see what I have.

 

From my experience -
1) the driveshaft lengths are different.
2) the location of the cross-member will change, but the same cross-member will be used.
3) the transmission mount is different.
4) the skid plate does not change.
5) the floor pans are quite different.
You also need the transmission and adapter plate. Pretty sure the bell housing is the same.

 

I know that some guys are frustrated with Herm, but he has everything you need except the drive shafts for $1650. Rebuilt T98, adapters. By the time you buy a trans, rebuild, adapters and your time, you might be approaching that dollar figure.

 

Ok since the driveshafts are different lengths and the cross member moves does that mean the power take off will have to be moved further back?

 

Since the transmission is longer and the transfer case moves farther back, yes, the pto shaft will need modified.

 

I think I'll just stick with the T90.

 

It sounds like a pain, but if there is any one mod to make to an F head powered jeep, IMO, it's the 4 speed transmission. Especially if you want to go to any larger tire at all.

If I can come across a donor rust bucket with the 4 speed, I will do it in my A1. But I've been casually searching for 7 years and haven't seen anything for sale that met my criteria.

 

So what does the transfer case shift levers and floor pans look like for a for speed? And what are the drive shaft lengths?

 

This is more effort than I'm sure you want to put into it, but just to show there are other options for a granny 4-spd behind an F- or L-head than a T-98...

I took a T-18 from a 60's Wagoneer with the Buick V-8 and adapted it to my 3B around 15 years ago and have never touched it since. That model has the Dana 20/late 18 adapter. The Wagoneers' T-18 input shaft was extremely long and had plenty of material to cut new splines into. I drew the plans and sent the shaft and the splined section of a Willys clutch disk to Moser Engineering. They had it machined and back to me within a few days for around $60!! For any of you having reservations about cutting splines into a hardened shaft (into its soft center), I beat that jeep beyond belief and it hasn't flinched.

I made my own adapter plate from 1" aluminum, used the (shortened) T-18 bearing retaining collar to center the plate to the tranny in a machined recess in the plate, and I used the T-90 bearing retainer to center to the plate to the bell housing in the same fashion. There is even a threaded hole in the 18/20 adapter plate for the clutch linkage pivot. I always assumed the mold was the same as the T-98.

I hoarded a bunch of those long shafts at the time because I had this grand idea to market this conversion, but it turns out, all of us who drive these old jeeps are cheap bastards!

 

Herm is fine. Just be a little patient.

 

Very cool. You need to be really committed to the F134 to put together a swap like this. I expect that most who could do this are also capable of an engine upgrade at the same time - and would choose to do that. But it's a groovy conversion nonetheless.

It's also an excellent lesson on how you can pretty much connect any engine to any transmission, with some machining and fabrication. Thanks for posting.

 

I love that old engine. So simple, tons of torque (for its size), plus I just got tired of searching for a T-98 within my $100 budget.

I'm currently working on a fuel injected Volvo 4 cylinder/4 spd adapter to a Dana 300 for my wife's '49 3A.

Where there's a will, there's a way!

 

Volvo ... that brings to mind a fellow that bought a bunch of M422 Mighty Mites back in the '70s and was putting Volvo B18s (?) into them. He had a write up in one of the magazines at the time, Four Wheeler or such. I went to talk to him when I lived in CA... he had a shop and a bunch of surplus vehicles scattered in his orange groves (back when OC meant citrus trees). He picked the Volvo because it had the same output diameter as the original air cooled Wisconsin - so all it needed was a plate adapter.

 

The T98 skid plate is much larger and has a different shape

The TC shift levers are same as previous with no rearward bends.
They are basically straight up and slightly offset to the side.
Would need to measure but the rear is roughly 5-1/2" inch shorter and the front is about 5-1/2" longer than standard.