I have a guy that wants to sell me some 3:90s. Ive done a little research and it sounds like these are the gears for me. Just wondering what the difference would be going about 75-80 mph. And what all will i need besides the gears to install them... will i need the rear end rebuild kit? i just rolled over 60k miles... and if i do need the rebuild kit.. do i get the one with or without bearings. Just need some good info about putting in new gears and doing it right... How hard is it? I used to be into the ricers but then i found out where the power is really at!!! So im alittle new to the REAR END.. lol Please let me know asap.. Thanks Guys..

 

what size tires do u have? and i'll tell u what ur RPMs are gonna be like on the interstate

 

i got 245's stock rims n tires.. but will be upgrading soon (BIGGER)

 

im running 4.30's right now, i love em, but the rpms are up to about 3000 on the freeway

 

ur RPMs will be around 2500 going 75-80

 

what about the hole rebuild kit? what is all necessary to get besides the gears? to get the gears in....

 

You should get a master install kit, summit has one avalible, so does american muscle. Comes with bearings, seals, and gasket for the diff cover.