sem76

Ya, 3.90s was a good choice till I found out they don't make a speedo correction gear for this set up. I guess I'll have to find a 3.73 or 4.10speedogearand have my MPH off like 5-10 MPH.[:@]

94StinkinLincoln

does this guy know how to install gears?

sem76

Yes, he says he's done it a couple times.

OneFine89Mustang

you will be fine with 3.90's though i think 4.10's would be a better choice, but its your choice, i think that guy doesnt fully understand the concept of rear end gears

94StinkinLincoln

he can tell you anything, he may not understand all the physics of the gearing, but hopefully he does know how to do it right, ask him about backlash and what it should be. get ford racing gears btw, they are much better.
if the gears are installed wrong, from not enough backlash, the teeth will eat each other and its toast, and if the backlash is too tight, then the gears whine its butt off, thats if i am not mistaken.

sem76

I already have the gears. I bought them from another forum member brand new. There Motive performance plus. Just waiting to put in.

mjr46

ouch!![:@]Motive gears!!!.....you might wanna google the probs with noise and motives[&:]

94StinkinLincoln

yup, no go on the motives, ford racing gears or nothing! lol

sem76

What!? I haven't heard anything bad about them. I don't think Ford racing has 3.90 anyway.

AdderMk2

motive gears are known for being noisy...

thats why I went with ford racing 3.73's