Switching from 3.89 to 3.00 gears...
#1
Switching from 3.89 to 3.00 gears...
My car is a 67 Mustang with a 9" rear, TKO-600 with .84 5th gear, tires are 26.1, and 3.89 gears. Currently I max out at around 75mph at 3100rpms. Kinda rough on the FE 428/7.0L that I have in it, especially after doing a few 1500+ mile round trips across the USA in it. I just moved to Germany and the cars here are crushing me on the highways here. The average speed, when the speed cap is lifted, is about 180kph/120mph. I have coil suspension all around and dropped it to the ground already but my rear gears are whats holding me back...It handles great at 135mph, it's just that I can't sustain that speed for hours at a time (if you're doing the math, that's 5500rpm). I have disc brakes x4 already, so stopping isn't a problem. I hate BMWs, Audi's and Merc's non-stop passing me...my poor American pride :'(
Does anyone here run a big motor with low low gears, like 3.10, 3.00 or 2.90...how much take off speed will I be giving up?
Thanks,
James
Does anyone here run a big motor with low low gears, like 3.10, 3.00 or 2.90...how much take off speed will I be giving up?
Thanks,
James
#5
Foghorn Leghorn
Join Date: Dec 2006
Location: I reside in a near constant state of amazment.
Posts: 2,923
Just this last weekend I FINALLY got off my cheap *** and upgraded the 8" pumpkin from the factory 2.80 peg leg to a 3.25 trac loc. I didn't go higher because I still have the C-6 and didn't want ungodly RPM's on the highway. I figured the 3.25 would be a good compromise and I have to say that I'm pretty tickled with it. It has, obviously, more oomph off the line while keeping the revs at an acceptable level on the open road.
I have always run a small block and even with the 2.80 in it I had plenty of pull off the line for any driving condition Hell, even with my 2.80 and a small block I was able to do great one-wheel squeals with minimal effort so with a big, healthy FE, you'll be just fine and be able to scald the hell out of your tires.
I have always run a small block and even with the 2.80 in it I had plenty of pull off the line for any driving condition Hell, even with my 2.80 and a small block I was able to do great one-wheel squeals with minimal effort so with a big, healthy FE, you'll be just fine and be able to scald the hell out of your tires.
#7
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