Black95MustangGT

Getting some gears before i start modding the engine up, i don't want to go with 3:73s i kinda want to go higher but not as high as 4:10s so im thinking going with the 3:90s

http://mustangtuning.com/motive390.html

what will i need to have them installed correctly besides that?

87 STANG

don't forget to chage the gear on the speed sensor

7upedition

auto 3.73 if your gonna drive on the highway, 3.55 for stick, this is what you'd need for 3.73's cost about $335 + freight
Sumitt Part # Qty. Price
RED-57904 3 $8 Gear Oil
FMS-M-4700-B 1 $45 Trak Lok Rebuild Kit
FMS-M-4210-C 1 $108 Install Kit w/ everything you'll need
FMS-M-4209-F373N 1 $158 Gears
23 Tooth Speedo Gear 1 $10 @ 5.0resto

The results are priceless!!!!

92fox50

How do you put in the speedo gear.......have to pull off the dash...then what? i've never changed mine out with my 3.55 gear..i just know it's about 10mph under what it says...