i am overheating because going uphill im at such high RPMs for so long . my jeep is constantly at 200 usually at 210 just driving around town even if in the mornings when its cold. so if i use the 4.88s i can use the stock axle but if i go with the 5.13s ive got to swap the axle? how well will 4.88s do for me? will i be able to make it uphill at 50mph? and maintain my speed on the freeway? and where can i buy 4.88s at? what all do i need to swap gears? thanks for your help.
Hmm, never had the overheating problem but it's something to take into consideration. You are correct that going to 5.13 or lower will require an axle swap.
Without knowing what size tires you currently have, it's hard to determine what you'r RPM's and speeds will be. BUT with 33's you should be ok. You'll be on the higher side but generally it shouldn't be too bad. This will be a huge change for teh ebtter if you currently have stock gears.
For 4.88 gears you will need to buy them from Superior, Yukon or USAllow, I believe. They are sold by different 4x4 shops like QTech and 4wdH, etc... ,as well as gear warehouses like Randy's R&P, West Coast Differential, etc...
You will also need to buy a 'Master Install kit' and make sure it has new carrier bearings with it. You will need two kits, one for each gear set. You will also need someone to install them. Prices vary greatly depending on where you look. 4X4 shops will be more expensive then speed shops. If you can bring the axles into the shop out of the vehicle, you can usually save a bit more. You can see prices anywhere from $50-400.
