dont know much about a doublers, but i thought the wheel base on a tj was to short for a doubler...maybe something like a klune would fit???If you have a 231 Tera 4:1, second would be a doubler, and the ultimate and best route would be a Atlas Tcase.
confused, isnt the 241 the rubi case???? if so isnt there a 4to 1 already in it?What year and auto or manual? Advanced adapters has a reduction planetary that replaces the empty tail housing of the 42rle auto. 03 to 09 autos and no change in driveshafts, just one extra shifter. 2.72 low which makes the final ratio 7.4 to 1 with a 231/241.