1965mustangman

To fit a 275-15 in the rear of a 92 4 lug what backspacing would I need so that it would fit perfectly. Im also going to put drag springs in it as well. I know it needs to be a 8" inch rim but the rims I am looking at (jegs sport lites) have a 4.5 and a 5.5 backspacing. Which one is best. Also I have 3.73s and I dont know if i should go with the 275-60s or the 275-50s. I dont want to have to tall of a tire. What size tire are yall runing on the front for a 15x4 inch rim.

luckythirteen13

with a 15x8 wheel, you want a 5.5" BS if you have a 275 tire. get the 275/50, you dont need a 60.
here is my car with a 275/60/15 in the rear and a 165r15 (metric radial) front tire

bighungrymatt

+1, 275/50/15 with a 5.5 backspacing is what I have, works great, I also removed my quad shocks when I upgraded U/L control arms

1965mustangman

thanks guys, by the way the cars look great.

bighungrymatt

your welcome, good luck

NYMustang50

I notice allot of people doing that(removing quads) what is the purpose of the guad shocks. I know where they are located and why you remove them but whats the reason they are on the car??

bighungrymatt

I believe the quad shocks helpstabilize your rear wheels, but they are cheap and 20 years old... once you upgrade your U/L control arms you have no further need of them

NYMustang50

O alright thanks.. Makes sense.

bighungrymatt

no prob, some people will leave the quad shocks on but just flip them over to fit 275s

WhiteWindsor

The purpose of the quad shocks is to reduce wheel hop, but they are not nearly as effective as a good set of upper's and lower's.