What T-case/Trans for My CJ?

[franked]

I have a 78 CJ7, I have added Howell EFI, dana 44s little bit of lift, 35s and 4.10 gears. I plan on changing over to the 4.0 head for some more power. I have a T18(b?) trans and a dana 20 Transfer case, The T-18 that is supposed to be in my jeep has a 6.35:1 first gear, but that was a T-18A, mine does not say A on it. My question is what would be strong, LOW-LOW geared for crawling, and maybe overdrive, of course I need whatever I get to bolt right up too.
maybe just a gear reduction for my T-case, with the 35s I have plenty of top end for the freeway. Is there a (more than 2:1) gear set for dana 20s, any recommendations? Thanks in advance to anyone responding, Frank

 

[David]

Yes, you can get a Tera Low gearset for a Dana 20 that will give you a 3.15 low range. If you're happy with your high end, then that's what I'd do. The T-18 is a great transmission.

 

[redrooster]

The T-18 is nice, but the Dana 20 will be a weak link. You should look into swapping a Dana 300. You will need an adapter to mate the 300 to the T18, but even then you will come out cheaper than buying a low gear set for the Dana 20 that will likely break anyway.
Back in the day I broke one Dana 20 tailshaft, fixed it, then broke the gearset. I was running D44 axles and 35 boggers. It didn't take much.

 

[franked]

Thanks for the replies, gives me something to think about, need to look up the ratio on the 300...not much better than what I have, I think I'll just wait.

 

[GafferGail]

You can get 4:1 gearsets decently cheap for the 300. You probably need to overhaul it anyway if you get a 300. I run a 400 with the 300. Adapters cost money, so its never a cheap swap, especially if its a Chevy t400, then you have to swap out the rear shaft for a 23 spline that will fit the 300. Novak has a kit for 5 bills. Stak also makes a kit thats a bit cheaper.

 

[franked]

I'm Just gonna chill on my t-case for now, budget needs to slow down on the jeep for a while. Sigh..