Author Topic: Driveshaft durability  (Read 853 times)

Offline Swampyankee74

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Driveshaft durability
« on: February 25, 2023, 09:57:32 AM »
I have a 74 c1500 which originally came with a 250 6cl. I now have a 465 horse small block with a m21 tranny.  Is the stock driveshaft going to be able to handle that with occasional abuse? Or turn into a twizzler?

Offline JohnnyPopper

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Re: Driveshaft durability
« Reply #1 on: February 25, 2023, 09:01:18 PM »
LOL Red twizzler

Pry a bd question.
1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline VileZambonie

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Re: Driveshaft durability
« Reply #2 on: February 26, 2023, 06:07:35 AM »
Didn't you say you were lowering it? If so what method did you use to lower the rear? Check your operating angles, make sure appropriate clearance, slip and good u-joints. Download the angle meter app on your phone.
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Swampyankee74

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Re: Driveshaft durability
« Reply #3 on: February 26, 2023, 07:55:03 AM »
I did lower it 4 inches in the back by spring hanger and shackle method. I'll make sure all clearances, and that the slip yoke isnot to far into the tranny, and new u joints. Just checking to see if that old tube could take the beating.