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01-29-2023, 01:31 PM | #1 |
Senior Member
Join Date: Mar 2015
Location: washington
Posts: 2,201
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Re: Driveshaft critical speed
They typically run the Dyno test is ran in direct drive, which ever gear that is in the transmission.
It is drive/3rd in the non-overdrive models. Third in the 700R4/4L60 and variants. Forth in the 6L80's as both 5 and 6 gear are over drives. On my tuck the tuner used 3rd gear (4L60E) and the speed topped out at 130mph at 6000rpm with 3:73 gears. I had no driveline issues. I have a one piece driveshaft. You can use this calculator to figure it out for your truck. https://purperformance.com/p-29669-rpm-calculator.html With your combination the drive shaft speed will be the same as the engine. Lets say 6000 rpm like mine. The rear wheel speed will be much higher because of your higher differential ratio (3:08) Tire speed will be close to 150mph. You will want good tires. Any decent tuner will limit the engine/tire speed to your specification. Good choice on the cam, perfect for the 4.8L. I always pick out the camshaft I want and purchase the next one down. It seems to work out better that way. Tuners will reset the full throttle transmission shift points. An important feature for drive-ability. That way you can use the power where its made. Cheers Last edited by Accelo; 01-29-2023 at 04:47 PM. |
01-29-2023, 04:29 PM | #2 |
Registered User
Join Date: Mar 2015
Location: Manchester, CT
Posts: 429
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Re: Driveshaft critical speed
150 mph, eh?! Talk about pucker inducement...almost like sucking on a lemon. There's nowhere in CT with roads long or straight enough to pull that off. I may be gettin old, but I aint lost my mind completely just yet. Anyways, this has been a good talk. Thanks. I guess I'll have a conversation with the dyno operator beforehand, just to see where their head's at. I'd sure hate to drive the truck there, then bring it home on a stretcher
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