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Old 05-24-2011, 01:35 PM
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which rear end gears to use?

Ok I'm running a sbc400 with a 500 lift comp cam (thumper). 2500 stall backed by a th350. Which rear end will be good for highway/cursing? The stock gearing I have is the 2.73. Any suggestions???

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Old 05-24-2011, 02:30 PM
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Rear End

I'm running a 327/350TH in a '51 coupe. I started with small block 400 back in '93 but blew that one up in less than year. for rear end I found a '57 station wagon in a junk yard in southern Calif. It fit nicely with a few modifications. For a good cruising speed, the car just settled into a nice easy pace at 90 or with lots of space still under the gas pedal. I don't know how fast it will go (speedometer only goes to 100) , but have pegged it many times without much effort on the engine. I don't know what the ratio is in the differential either. when I took it down and counted the teeth, it must have been a bad day or something because it didn't make any sense. I didn't record it either as it was my driver back then and had to get it back together and rolling. But whatever the ratio is, it sure did like to settle in around 90, with lots left if I felt like I wanted it.
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Old 05-24-2011, 09:57 PM
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Quote:
Originally Posted by fasteddy_1947
I'm running a 327/350TH in a '51 coupe. I started with small block 400 back in '93 but blew that one up in less than year. for rear end I found a '57 station wagon in a junk yard in southern Calif. It fit nicely with a few modifications. For a good cruising speed, the car just settled into a nice easy pace at 90 or with lots of space still under the gas pedal. I don't know how fast it will go (speedometer only goes to 100) , but have pegged it many times without much effort on the engine. I don't know what the ratio is in the differential either. when I took it down and counted the teeth, it must have been a bad day or something because it didn't make any sense. I didn't record it either as it was my driver back then and had to get it back together and rolling. But whatever the ratio is, it sure did like to settle in around 90, with lots left if I felt like I wanted it.
In a different car I ran the the same motor/tranny setup but without a 2500 stall. The converter was stock so 55mph was at 2500 rpms with the 3.73's. What im looking to find out is will it take more rpms with the stall??? Or will things even out? Never ran a stall before.
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Old 05-24-2011, 11:58 PM
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Without knowing your tire diameter this will be just a guess but I would use a 3.25 -3.50 gear, all depends on how much hwy driving you do, how fast you drive and what kind of gas mileage you want to get. If it's just for around town then a 3.89 would be good. Those 2.73's will really limit your acceleration....and no the stall will be same as a stock converter just going down the road. It will only really slip when you nail it, normal driving you'll never know you had a stall conv...besides its only 2500, not 3500.
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Old 05-25-2011, 07:32 AM
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The vehicle is a 84 cutlass supreme
Standard 195/14 tires
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Old 05-25-2011, 07:40 AM
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3.42 would be good if your staying with that tire size.JMO
Also you can't put just any gear ratio in there they are set in series. and IIRC 3.73s won't fit in your housing that car should have a 7.5 in it IIRC.
not saying you can't run 3.73s but there is work and other parts involved, Is You might want to consider a rearend housing change from a different car before it's all over with, Is it ever going to see the track ?


Cole

Last edited by eloc431962; 05-25-2011 at 07:51 AM.
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