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Old 11-24-2019, 12:30 PM   #22
kipps
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Join Date: Jul 2014
Location: North-central Virginia
Posts: 1,099
Re: 4.8 into 74 3/4 ton 4x4

Quote:
Originally Posted by Ziegelsteinfaust View Post
....I would go 5.13's, and with 35's your at 2500 rpm at 65. This will make the engine happy, and let it work where it makes power....
I think you made a math goof. With a non-OD trans like the sm465, you'll be turning 3200 at 65 with those gears and tires. If you have a .75:1 overdrive, like in a 4l80e, you'll bring your rpm down to 2400 at 65.

If the OP intends to run a sm465 long term without installing a OD unit, I'd advise going with 4.11 gears.
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1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome!
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