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Old 04-09-2003, 09:23 PM
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Post Gear ratio question

I have a little question to get yall's opinion, first of all you need to know my little setup i have. I have a 1993 chevrolet single cab short wheel base pickup. I have a 383 stroker, mild set-up dyno made 343 hp @ 5200 rpm and 464 ft lbs of torque @ 3400 rpm. behind that i have a highly modified 700r4 tranny that a local shop built for me, and the rear end is where i have the question at..... right now i have a GM 10 bolt 8.5" rear end with a 2:56 gear single track tire. i have another GM 10 bolt 8.5" but it has a limited slip unit in it. what gear ratio should i put in it i was thinking 4:10 but i may turn too many rpms down the interstate but awesome from red light to red light. then i thought about the 3:73 gear but i dont know what gear i want. i want something to that i can come harder out of the hole, what do yall think the best gear is for me, its an everyday driver too. and it may see the track just to go play around with friends and have a good time nothing serious. ohh and by the way my tire size is 295/50's. i think thats all the info ya need to decide if you need more let me know. Thanks

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Old 04-10-2003, 01:53 AM
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sounds like a real nice truck, being you want to keep a decent cruise RPM i`d go with a 3.42 or 3.55, with that kind of torque and the low 1st gear of the 700R4 it`ll still have awesome take off power from a stop. and if your not already, run a external tranny cooler. being heat`s the number 1 killer of automatics I always recommend one. good luck good rodding.
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Old 04-10-2003, 04:51 AM
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With 295/50/15 tires and 2:56 gears you are currently running 1779 rpm's in drive, and 1245 rpm's in overdrive at a speed of 55 mph.
With 3.42 gears you would have 2376 and 1664 rpm's.
With 3.55 gears you would have 2467 and 1727 rpm's.
With 3.73 gears you would have 2592 and 1814 rpm's.
With 4.10 gears you would have 2849 and 1994 rpm's.
These calculations assume your tire measures 26.61 inches in diameter, and 83.60 inches in circumference.
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Old 04-10-2003, 09:45 PM
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Thanks for the replies, i liked the calculations you've too, it gave me a better perspective of how many RPMS' i'll turn. and i am running a tranny cooler too it was the first thing i done before installing the transmission, i guess any cooler is better than any, i dont know the name brand but i got it from Auto Zone, its worked fine so far. But i think i am going to get the 3.55 gear so i can still have decent top end and good take off it seems to me like a good gear for my set-up. thanks alot
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