i have been looking around for the answers to these so i wouldnt have to ask people and have them say use the search but it isnt working. im lookin into getting a set of frpp 4.10s for my car but i have 90000 miles so i assume i need a bearing kit. so here are a few questions that some of you may be able to answer:

1. if i get ford 4.10s will a motive bearing kit work with it?

2. will i need to upgrade to significantly better tires to avoid spinning out. people say its a major problem but i cant afford super wide tires with DR's, what would happen w my street tires if i floored it with the 4.10s?

3. can a dealership tell if you have 4.10s (i have a warranty )

thank you very much for all of the help!

 

1) yes
2) it would help if u got some new tires, but u dont need em. if u punch it in 1st ur gonna spin..2nd is where the magic happens. go about 1/2-3/4 throttle in 1st then punch it at about 3500-4k
3) yes they can but dont worry about it.. they have to do a test first before they can tell.

 

thank you for all of the speedy yet informative stuff. how can i tell what i have in my car now? i got the car used so how can i tell if its got stock gears. im pretty sure it is. i spin out for about 3 seconds in 1st and ive only hit a 9.5 in the 1/8th mile. its an automatic but is there something my car should do to tell me i have stock gears and not something higher? do you understand what im saying. i dont know whats under my car so i wanna findout but im almost positive its stock

 

Put the rear on jack stands, mark a spot on the driveshaft and spin the rear wheel one full rotation and count how many times that mark on the drive shaft passes the orginal point.

3 and 1/4 times is stock
3 and 1/2 times is 3.55
3 and 3/4 times is 3.73
just over 4 times is 4.10

 

awesome thank you