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Author Topic:   rear end ratios
MOD55J
Dirt Newbie

Total posts: 4
posted May 28, 2001 04:40 PM
would like any suggestions on good ring gear ratios to start out with for ford 9" rear end

jammin
Dirt Administrator

Total posts: 3279
posted May 28, 2001 04:45 PM UIN: 16262997
what size track mod?

CUSTOMPERFORMANCE
Dirt Freak

Total posts: 213
posted May 28, 2001 04:48 PM
for a mod with a 355-377 at a large 3/8 like boone ia run a 5.43-5.67, for the 355 if it isnt real strong use a 5.83. if you have a decent 406 run the 5.43 and if its a real strong 406 maybe even a 5.29.
1/2 mile tracks run anywhere from a 4.56-4.86 and if it gets slick maybe even a 4.33.

these will help you get real close but in the end it all depends what your engine combo is and the rpm range of the cam

MOD55J
Dirt Newbie

Total posts: 4
posted May 28, 2001 04:54 PM
quote:
Originally posted by jammin:
what size track mod?
1/4 mile tracks

MOD55J
Dirt Newbie

Total posts: 4
posted May 28, 2001 04:56 PM
this car is run on 1/4 mile tracks with good powered 355 ci

[This message has been edited by MOD55J (edited May 28, 2001).]

MOD RACER#93
Dirt Freak

Total posts: 251
posted May 28, 2001 08:16 PM
6.00 for a 1/4 mile....

dirtracer14
Dirt Maniac

Total posts: 128
posted May 28, 2001 09:23 PM UIN: 23443678
Is it a fast 1/4 or a stop and go? We have run 5.29s on a fast 1/4. That was with a 355 and a 383 turning about 6500 to 6700 depending on what the track was doing.Most of the guys that run there run .43s to 83s. Just my 2 cents!

Roadhzrd
Dirt Maniac

Total posts: 101
posted May 28, 2001 11:11 PM UIN: 28276986
It also helps to know what rpm the powerband of your cam kicks in. If you have a snappy cam you may need to run a higher gear to help save from spinning too much. What kind of corners on the 1/4 miles? wide and banked or sharp and tight?

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