Recently I realized that my transmission was going south but did not really know how bad until I tore into it. My T90A was beyond any practical repair
So I decided to Get another one from Herm, Seeing how I had to spend the bucks anyway I thought I would cough up the extra and give the T90C version with its lower 1st and 2nd gears a try...........And its great! I am not wishing for a 4 speed anymore, This is a great option for anyone with a T90A wanting lower gears but cant amortize a proper 4 speed conversion.
The lower gearing made a new machine out of the old cj, Its noticeably easier to take off in high range from a stop and It made a HUGE difference climbing around in low range ........ And I dont have to ride the brakes hardly ever anymore going back down these steep grades The gears are just low enough the engine can now hold the rig back unassisted 90% of the time
In high range the lower 1st and 2nd are the perfect dirt road cruising gears ( for me anyway ) with the 5.38:1 differentials, Second gear on the T90A was a little to fast on the rough roads locally unless you were nearly lugging it just above idle, Letting off the throttle for a rough spot usually meant a shift into 1st. Second gear in the T90C is low enough that you can slow down for a rough spot and gently throttle out the other side without shifting into 1st about 80% of the time and it is not over revved when you get back up to speed...........In fact my manifold vacuum gauge shows slightly higher vacuum ( 1hg - 2hg ) at the speed I like to drive in second.
There is a slightly larger gap between 2nd and 3rd so it would mean a slightly slower pull in second through the mountains once a shift into second had to be made but its not hard to get used to, In that respect the T90A version would be a little more "street friendly " by comparison.
I thought I would post this for anyone thinking about this option, As I am very happy with it