Need Help With Gear Ratio

[BERTIE RENEGADE]

Cause I always skipped math class! I have a 79 cj and I previously had a t150 and d20 with 44's and 401. I am changing over to a turbo 400 and 49'' Irocks, keeping the d20 and 401 what do you think about the 5.38's,I'm mostly street cruising with this one. The 5.38's ran well with the manual trans. Thanks

 

[Jeff B]

You will need rockwells.

 

[BERTIE RENEGADE]

Are you saying rockwells because of strength or ratio? I have a set of one tons from a 78 gmc camper special that I had planned on using.

 

[Jeff B]

Strength, ratio & cost.

 

[upnover]

Final ratio for either transmission is 1:1, but you didn't say what tire you were running before(size)
You will be doing some major huffing running that set up with 49's
I foresee carnage off the trail.
Ring and pinion
Drive shafts/u-joints
Burned tranny
t-case gears

all in all it's just not a good combo.

 

[tjt75]

gear ?

I took it as he was already running 44 inch tires not that he was using dana 44's for axles.

 

[BERTIE RENEGADE]

I guess that could be taken both ways the (44's) meant tires, although I was running dana 44 (front) and dana 60 (rear) with no issues.

 

[4x4K5]

if you run the axles from the 78 truck, and it is a 14 bolt/44 combo you should be fine. I ran that on my truck with 44s and I went through transmissions long before i broke anything else. If you gear it to a 5.38 it should be cool. But I would never put a turbo 400 in it. It will rob power, and just not good for big tires. If you run a sm465 you would be much better off. If anything you would be replacing clutchs instead of transmissions. I did the automatic thing, and that is why I have go with manuals ever since.

 

[BERTIE RENEGADE]

Thanks for the inputs, Ihad a couple of turbo 400's laying around and also a t-18 minus the shifter and top plate, just trying to use what I had. Thanks !

 

[4x4K5]

I had a t-18 in my j truck and really liked it. it would just bury it in 3rd.