Ford 9" rear ratio discussion

[markrieb]

Most autocross tracks run 60 mph or so at the fastest part of the track for the faster stock cars (SCCA rule/suggestion/insurance limitation).

Gear the car to run between 60 to 70 mph at redline in 2nd gear

[Vegas69]

That would probably mean about a 4.88.

[randy]

The 3.70s are perfect. Cruising 70 plus mph at 2200 rpms helps on gas and noise. 5th gear is more usuanle around town. 2nd, 3rd, and 4th is still a blast. Only bad thing is my gears make some noise while decelerating above 40 mph to 60 mph

[TheJDMan]

I realize we are splitting hairs now but I'm running a surplus NASCAR center section with a 3.89 and I think it is perfect with my 26" tire. I recommend that you take a look at the Tremec gear ratio calculator and play with different gearing to see what suits you.

http://tremec.com/calculadora.php

[randy]

I just wish moser would have built it right in the first place. Made noise while accelerating before and after a new gear swap it makes a slight noise during deceleration but acceleration if quite as can be. Buddies moser made a real bad noise and after new gears it's dead quite all the time.

Not worth pulling the 3rd member on the ground again. Total pita

[simon455]

I purchased ex nascar 9" cooled center section with g force locker (run sutton has tuning springs for them) Its equipped with pretty odd 3.80 ratio rem polished gear set.
Would of gone with 373s but came across this center section and decided to give it a try. Price was really right consider nascar team pays over 5k for one of these. Car still in progress, lsa/tr6060 335 30 18s

[carbuff]

I'm curious where you purchased the center section from. Is there a particular good site to shop for these parts? As I recall, there are several vendors of these types of parts...

Thanx.