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**mongocanfly** · 01-28-2023, 07:56 PM

They ran my truck in 4th gear, 1:1 ratio, with 4.10s and 30in tires.. I saw it hit over 130mph on the dyno screen...sounded like it was gonna twist outta the frame..I'll look tomorrow but I'm sure its was in the 6k rpm range
But if your having a driveshaft made, a good driveshaft shop takes all that into consideration
A aluminum shaft will have more dia than a steel shaft to do the same job..
Personally, I'd go steel

01-28-2023, 07:56 PM	#3
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,598	Re: Driveshaft critical speed They ran my truck in 4th gear, 1:1 ratio, with 4.10s and 30in tires.. I saw it hit over 130mph on the dyno screen...sounded like it was gonna twist outta the frame..I'll look tomorrow but I'm sure its was in the 6k rpm range But if your having a driveshaft made, a good driveshaft shop takes all that into consideration A aluminum shaft will have more dia than a steel shaft to do the same job.. Personally, I'd go steel __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver Last edited by mongocanfly; 01-28-2023 at 08:05 PM.