t-98 swap

First time poster here. I recently bought a '69 cj5 v6 3 speed and I got alot of work to do. This really isn't first on my list, but I ran across a mid 50's to early 70's t-98 IH 2wd rebuilt tranny for cheap. Can I swap that just like a t-18, or is there more involved? also I am going to run 34x10.50's moderately, will the stock d27 hold, or should I swap the front axle and steering while I am at it? Thanks

 

I think you'd be wasting your money on this T-98. Generally IH stuff is different from every other manufacturer. Pretty sure that you'll find that noone has adapters or even much info on a IH T-98 for either the bellhousing or transfer case end.

Look for a T-18 from a Jeep truck. That will already bolt to your transfer case (saving a lot of money on the transmission-TC adapter) and adapting the V6 bellhousing is well understood here.

<edit> Welcome from Boston!

 

What tim said.

IH's tend to have huge diameter long input shafts. You'd probably have to swap that out. The output shaft isn't likely to work either and you'd need an adapter. It's doable, but T-98 parts are hard to come by, and the shafts are slightly different from T-18s. (You can see what I went through to get my T-98/T-18 hybrid to work here.) T-18's are easy to find, and as Tim said, the J-truck ones already have the correct transfer case adapter and output shaft.

 

Good info here about trans swap, T18 also pics, beware of T18B(close ratio jeep truck) trans, Novak does not have input shaft kit for these see website links for more info. http://earlycj5.com/forums/showthread.php?t=21501&page=2

 

T-98A's in the jeep product line are different from other t-98A's. The case is different for starters.

The IH transmission has even a third case bolt pattern.

There are some big differences between the t-98 and t-98A.

I know of a fellow that has a t-18 behind the V-6 from the factory. It is for sale; I'm not sure what he wants for it, but if you send me a private message I'll give you his phone number. You would likely have to buy the whole jeep to get it, but I am not sure.

However, the t-18 has a 4 - 1 first gear ratio; not quite the t-98 granny.

The M715 has a t-98, but I don't know if the front input shaft would work in the V-6 application.

If you are really gutsy you'll search out a t-97 and adapt it. The t-97 was very similar to the t-98 only it is a 'crash box' that is, no gears had synchronizers. It requires a whole lot of driver involvement to manage one of those.

I have a Hollander special transmission cross reference for Warner, New Process, and Clark transmissions that has a parts list for the t-98 / t-98A. if you need any jeep or Warner gear part numbers, let me know the part and I can tell you the OEM part number and what, if anything it will cross to.

 

I read a lot about getting an input shaft machined to fit. However I have never found anyone who has actually had it done.

Every shop that I have been to (admittedly it is only a few) has told me that they didn't want to fool around with heat treated steel.

I suppose you'd have to solution heat treat it, machine and re-spline and then age heat treat it.

That's gotta be expensive.

 

Its not so much heat treated metals in general its the splining and paying to have it re-heat treated, especially when the heat treating company doesn't really have a clue of what its made from. Annealing the original shaft is easy, if your patient and have a means to measure it, resplining can be easy enough but thats a relative term. I have made gears and such but for 1 offs its expensive, it took 3 1/2 hours to make a small 16 tooth gear for my southbend lathe, heat treating would have only taken about 2 hours as I made the gear out of tool steel it wasn't necessary for my use so I left it soft. Gear steel like 8620 requires about 6 process's to harden it and for 1 offs would run several hundred dollars to have heat treated.

 

Ill let you know how mine turns out , I have make my Input shaft. A local machine shop makes custom inputs for dragsters so I guess there work might be able to hold up to the :hurrican:

 

Thats good Jason cause at that rate yours won't be a 1 off since they make others,it will save money on setup and heattreat. Let us know how it comes out.

 

thanks for the info! I'll post some pics now.

 

Disclaimer:it is always best to verify the tooth count on any T18 to make sure it is what you need.