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Old 07-05-2007, 09:09 PM
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86 cutlass

what kind of rear end should i go with, i have a 355 with a cam in the 2000-5500 rpm range and a 2400 stall. i'm confused about the 342 gear and a 308 gear. which is the better gear, or can somebody help choose a better gear

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Old 07-05-2007, 09:29 PM
BMM BMM is offline
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86...200-r4, or no overdrive?
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Old 07-05-2007, 10:09 PM
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Hi,
The higher the numerical value the lower the rear,
a 3.08 means the drive shaft will turn over 3.08 times
while the wheel will make only one revolution,; so on the
highway the engine will run at say 1,500 rpm the car would
be doing about 70 mph (these figures are out of the air for
an example)
Now with the 3.42 the same rpm 1,500 speed now is 55mph
also with the 3.42es you would be able to light them up easer.
As for recommending a gear ratio there is a more information
needed, what do you want to do with the car, what kind of car is it,
trans. I just noticed it's a cutlass, still need the other stuff.

Good luck,
rich

Last edited by richard stewart 3rd; 07-05-2007 at 10:17 PM. Reason: missed stuff
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Old 07-06-2007, 06:04 AM
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the trans is a th350, i want to be able to drive the car on the expressway but every now and then make a pass on the strip.
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Old 07-06-2007, 06:12 AM
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IMO, you will be happier with the 3.42's. If you had an OD trans, I would look at a 3.73 at least.
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Old 07-06-2007, 09:15 AM
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I went with a 3.42 gear in my 86 cutlass and It was such an improvement over the 2.73s that were in it. By the time you buy the gears and and have it all installed you may be better looking for complete 8.5" rearend from a turbo buick or 442 cutlass. I put a stock posi in mine and destroyed the spider gears with a mild 350.
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Old 07-06-2007, 10:00 AM
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Hi,
Well with a th350 I would use a set of 3.55es if I were
on the highway a lot, but if I were just running around town
I would step up to 3.73 or higher (lower). When I drove in
the city (philly,) I ran 4.88es. light to light racing. I also think you should
follow RippinRon's advice about changing to an 8.5".
Take care & Good luck,
rich
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Old 07-06-2007, 08:26 PM
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ok, if i go to a 342 gear what rpm will i run @ 55-65 mph. i have a pair of 15x7 centerlines but don't what size tires to put on the car. plus i can get a 308 gear drum to drum for $300.
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Old 07-08-2007, 06:11 PM
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Hi,
My guess would be between 19 & 2500rpm somewhere
in that general neighborhood.
rich
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Old 07-11-2007, 07:38 PM
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ok

thanks alot, is there a why to determine tire size so i can c where im at with either rear end. i mean what at 65 mph w/342 gear i be @ ? rpm.
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Old 07-11-2007, 08:14 PM
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Hi,
Go to the link below, scroll down to
Actual speed change from Ring & Pinion gear
change calculator, Then when your finished with
that scroll down further to Tire size calculator.
you should be able to find everything you want
to know here, & then some.
Take care,
rich

www.csgnetwork.com/rgpspeedcalc.html
www.csgnetwork.com/rgpspeedcalc.html
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