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LeesTruk · 01-28-2023, 01:10 PM

I'm putting a mild 4.8L/4L60E into my '89 Cheyenne. I'll be taking it to be dyno tuned, probably this summer. My concern is, "how fast do the tuners usually take a vehicle on the dyno drum?" I want to be sure that the stock driveshaft won't turn into a pretzel at some unfathomable speed that the truck will never see otherwise. I'm considering having a 3.5" shaft made, either steel or aluminum, but if the stock shaft will handle a few pulls, then maybe I'll keep it. If anyone kinda knows the answer to this, please let me know. Thanks

BTW, the truck has a 3.08 gear, and the little 4.8 likes to make some high rev's. The cam I'm running is a TS&P stg. 1 truck cam (208/214 @ .550 lift).

01-28-2023, 01:10 PM	#1
LeesTruk Registered User Join Date: Mar 2015 Location: Manchester, CT Posts: 429	Driveshaft critical speed I'm putting a mild 4.8L/4L60E into my '89 Cheyenne. I'll be taking it to be dyno tuned, probably this summer. My concern is, "how fast do the tuners usually take a vehicle on the dyno drum?" I want to be sure that the stock driveshaft won't turn into a pretzel at some unfathomable speed that the truck will never see otherwise. I'm considering having a 3.5" shaft made, either steel or aluminum, but if the stock shaft will handle a few pulls, then maybe I'll keep it. If anyone kinda knows the answer to this, please let me know. Thanks BTW, the truck has a 3.08 gear, and the little 4.8 likes to make some high rev's. The cam I'm running is a TS&P stg. 1 truck cam (208/214 @ .550 lift).