How have you found engine breaking with the auto compares with the std?
With the the 4 to 1 t-case, 4.10 gears and 35's, it "feels" about the same as my last manual tranny Jeep which had 4.02 1st gear, 2.72 t-case, 3.73 gears and 32's.
If you do the math using 2.5 for a 1st gear auto ratio, the crawl speed is 41 to 1 with the auto equippped Jeep (2.5 x 4.0 x 4.1) The manual equipped Jeep (4.02 x 2.72 x 3.73) equates to a 40.78 to 1 crawl ratio.
My current setup is 51.3 crawl ratio.
This doesn't take in consideration the auto's torque converter offers unlimited reduction.
The crawl ratio is far from the hard-core rigs which often get into the 100+ to 1 ratios but it works for me.
I haven't trail tested it since the 5.13's were installed but even with the 4.10's I seldom used the brakes on the hills.
Vince