Topic: Re: change differential ratio
in Forum: C3 Driveline Components
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Yep, when I had my rear end rebuilt 7 or 8 years ago the guy at first had trouble locating a 3.36 ring and pinion set. I balked a bit and I'm glad I did because I still think it's the best overall ratio for a cruiser that still has its 1:1 top gear original tranny. The guy ended up finding a 3.36 and I got what I wanted and didn't have to change my speedo drive gear thingy.
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Equinunk, PA - USA
Joined: 10/31/2007
Posts: 2468
Vette(s): 1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.
The 3:36 works good for me. Gas is around 18, but hole shot suffers. I am not interested in smokin tires anyway. If your gonna drive any distance the TREMEC 5 cog will take "MANY" hours in the white line lane to have it pay for itself in gas savings. If your gonna spin around town and play with compeditors then go with the 5 speed. I was discouraged from going with a 3:08, and it was a good decision.
Thanks for the advice on the 3.36. I am checking that out with my tech now. I don't think that I want to try to get the rear end out on my own. My tech has done a lot of rear end repairs. He had one on his bench yesterday when I talked to him.
Your 3.64 1st. gear times the new 3.36 rear gear ratio yields a nice total ratio of 12.23.
On the other hand, an old Muncie close ratio with a 2.20 1st gear times an original 3.73 only netted a crappy total 8.21 ratio. I don't believe going to a 3.56 ratio is enough change to be worth the money or effort.
So I like the 3.36 ratio. Your rpm's and torque will drop by 10% and your MPG should increase a little.
John
1973 BB 4-Speed Coupe Project Car
2009 Z06 Mostly Stock
in Forum: C3 Driveline Components
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