Today I am having my 4:10s installed in my Car!!!! I am getting the FRRP 4:10s, so I hope there is not whine. The shop that is putting them in work on Mustangs all the time so I'm hoping they do a good job. The only thing that bothers me is that gears are the one thing that you really have to trust the shop putting them in, due to they might put in 3:73s and how would you really know if they put in 4:10s without taking the rear apart. But I am going to drive it home and watch the speedo before I use the SCT to calibrate my gears. Do you think I would be able to tell the diff between 3:73s and 4:10s just driving it???? Man I hope I don't get ripped off...

 

they ain't gonna rip you off.

And if you're that worried, stay and watch, learn a little too. I always stay and help with any of my performance mods.

 

Well, theres not to much difference between stock 3.27's and and 3.73's, and there's a huge difference between stock and 4.10's. So If you're not satisfide then they probably put 3.73's in, but if you're really satisfided then they put 4.10's in, but I doubt a shop would rip you off like that anyway.