SICKGT89

Has anyone installed a set of 3.90 gears? i was getting ready to order a set of 3.73 gears and i read a little about the 3.90's. are they worth buying or should i still stick with the 3.73's? i drive my 1989 gt (manual) everyday to work and back. however there is a 1/8 mile drag strip close by and i want to run the car there every now and then. plus we have a vette fest here in the summer and id like to eat a few vettes between stop lights to.

1989 mustang gt, gt40 heads, cold air intake, full flowmaster exhaust, manual trans.

nightmare90gt

if you drive it as a dd then stick to 373's

ProTrickVic

don't fear the gear. 4.10's or 4.30's if NA.


i'm running 4.56's and might switch to 4.88's in the future. if you're concerned about fuel mileage....buy a honda.

AdderMk2

i have 3.73's now, and the car is getting 4.30's when I get home from deployment

kurtmuller82

I have a 87 gt 5-speed and went with 4:10 gears. I only drive my car on pretty weekends! I love the gearsss but would probally reccomend 3:73 for a everyday driver.

holyshift

If ya aint sprayin it or throwing boost to it,as stated,gear the pi$$ out of it. 4.somethings.

nitrous_bob

4.10 or leave it stock.

it's ok to leave it stock... i know a lot of people who are scared to go fast.

but if youd like a mediocre car go 3.73 all day long. gas mileage diff is minial at most when comparing 3.73 to 4.10 however torque multiplication is huge. 3.90 is for people who are a little more hungry than a wendy's single... but afraid to go with a triple if you get my drift