My CJ is my daily driver. Im putting on 36in tires(I have 35 dunlops now that are 34,7s in reality) and putting in a D20 low gear kit. Stock my CJ had 3:54s with 29in tires (I think 29s?), according to some gear ratio charts it ran @2450 RPMs @60 mph.
If I put 36s on I should run @ 2300 RPMs @60mph, I have 4:10s in now and a t18 w/6:32:1 first gear and a 6cyl. Will I tear up the trans or go thru clutchs with 36in tires? Thanks for any advice.

no, that first gear is really deep. you have a 1st gear high ratio of 25.9:1. That would be the same as having a newer manual (roughly 4:1 first) with 6:1 diff gears.

My first gear is not syncronized(SP?) so I dont use it, Do you think Ill have any problems starting out in 2nd as I usally do?

you should have slightly better gearing in high range then I currently have with 33's and 3.50 gears... and I always take off in 2nd with no issues

I ran 38 SX's with 4:10's and a T18 with the 4.0 Jeep YJ motor. 2nd worked fine to start and I cruised 65-70 no problem :beer:

My first gear is not syncronized(SP?) so I dont use it, Do you think Ill have any problems starting out in 2nd as I usally do?

don't think of first gear as first. Think of it as "low". Your second gear is really your first gear. you should be fine with that setup

Great! Thanks guys! I was hoping for this kind of answers. I really appreciate your help! Thanks again!!