I have an 89YJ that I have lifted 3.5" with 33" tires and just installed the 4.0 engine swap and all works great. I would like to install some new gears, But have been told several gears will work 4.11- 456 are the main two? Because this is my daily driver I would like to install the right gears that work the best for performance and mileage, does anyone have an opinion on this that could help me? I have a Dana 35 rear & Dana 30 front and should I match the front gears with the rear or could I do the rear now and front later or am I going to have problems with 411 or 456 in the rear and stock gears in the front?

I also just received my Posi-lok system to do away with the old stock vacuum 4 x 4 engagement system. Has anyone heard any good or bad things about the Posi-Lok?



89 YJ, 3.5" Black Diamond Lift, 33" tires, 8000lb Warn, 4.0 91 XY engine swap.