CrazyGT

I was thinking about lowering the gears in the car is it save just trying to get some input

Blackvenom01

i believe 4.11 is chevy gears not tryin to be a tool just making sure you would get the right one...but most all people on here say no 4.10's for superchargers and i would have to agree...i have 4.10 and its fun trying to get traction with my mods let alone a sc...i am in the market for a sc havin a hard time figuring out what but i have already talked to some buddy mechanics bout droppin them to 3.73 or if i feel ballzy 3.90....as for safe yes unless you have some rookie in there and floors it and slaps the rev lim everytime

Timspony

..I'm feeling 3.90's ....73's not much different from 3.55's!! ...Ford gears are 4.10's for the record...

SVTeeshirt

i wouldn't go 4.10s in an 03 if you still have the eaton. You'll have alot of traction issues. and 3.55s to 3.73s just doesn't seem worth it to me.

I'd say port and pulley the blower is gonna be the best thing for you to do, along with an IRS brace and head cooling mod.

Stang9946

I've seen 4.11s for Ford in Summit magazines...weird =\

Blackvenom01

thats wierd...but as for me and everyone around me we use ford racing gears and those are 4.10 i wouldnt play around with 4.11 even if it does say for fords

Timspony

...Ford 4.11's for a 9" rear (old school)! ....1986-current Mustang 5.0's, 4.6's, 5.4's and 5.8's use the Ford 8.8" rear = 4.10's!

SVTeeshirt

^ yep, most high power applications use a ford 9 inch

Timspony

True! ...but trust me, the 8.8" holds its own!

Stang9946

Yeah, that's it. I thought it was a 9" but wasn't sure.