Rebuild T90 or swap to T19?

What's up everybody. So I need to rebuild my T90 Tranny. I see everyone raving about the T19. I was wondering if it bolts right up to my D18 Transfer case? I'm running a sbc 350 in the Cj2a as well. From what I understand the T90 is a pretty stout tranny, but this T19 is going for about $250. It'd be less expensive to go with that, as long as there isn't a $500 piece I need to attach it to the D18. Actually, I have to rebuild the D18 as well, so if there is something that works better with the T-19 I'm open for suggestions. I like the option of strapping an OD to the D18 though. It's pretty cool to have that PTO in the jeep. What do ya'll think?

 

A conversion to a t-19 is far from cheap. It will have to be adapted to your motor and transfer case Depending on what the t19 is from it can have one of three first gear ratios. 4-1,5-1, and the least common 6.32-1. The case and input shaft may need to be swapped also depending on application. It will most likely need rebuilt, drivelines modified, floors cut and modified, clutch linkage addressed, and more. This is not a cheap proposition nor is it a bolt in. A T-18 might be a better swap but many of the same things apply depending on what the T-18 is from. The easiest/cheapest route would be most likely to rebuild your t-90. IMHO $250 for a used unknown condition, unknown gear ratio T-19 is too much

 

Ok thanks for the knowledge. Much appreciated!

 

Also, if you swap out the transfer case you will need to swap to a different rear axle assembly to match the transfer case output.

I'd like to add the t-18/19 conversion is a good one but if a $500 adapter scares you then it's not for you. Oh, clutch will need addressed as well.

 

with the small block chevy in you jeep I think the sm420 ot 465 would be your easiest swap I have seen the trannys with adaptors (used ofcourse) go for $300-500 The Last tranny swap I did was a NP435 dana 20 in a wrangler ( I already had tranny transfer case) I had close to $1000 in new HD drive lines and Linkage and clutch, tranny mounts Having exhaust modified etc, That was with me doing all the labor except the exhaust. Just for a reference when you start doing magor Modifications there can be a lot of hidden costs.

 

2x on the above. If you are already sbc, the 420 or 465 will be an easier route and likely the cheapest.

 

I didn't know this, what are the things that don't match up?

I had always planned on throwing in a US trans and tcase should either of the JP ones die... Perhaps I need to reevaluate this.

 

The Jeep Dana 18 has an offset rear output, in line with the front output. The differentials are offset to line up with this. 90% or more of other transfer cases have a centered rear output which means you need a centered diff to line up the drive shaft correctly.

 

Whew, I'd be staying with an offset, so no problem there. Herm claims the JP tcase input shaft is a different diameter, so that (and the bellhousing) will be the issues should the unfortunate death of my drivetrain occur. But I digress from the OP's problem, sorry for the small hijack.