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Author Topic:   rear end ratios
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

posted May 28, 2001 04:45 PM
what size track mod?

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

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

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).]

posted May 28, 2001 08:16 PM
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!

posted May 28, 2001 11:11 PM
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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