The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - SM465 to 700r4: Different driveshaft lengths?

kipps · 07-03-2021, 05:57 PM

If I got this straight --

1987 v10 complete drivetrain and driveshaft.
1984 k20 chassis and axles.

The 1984 sm465 doesn't factor in at all. The only potential problem I see is where the 1/2-ton driveshaft connects to the 3/4-ton axle.

#1, you "might" need a conversion joint. A 1987 3/4-ton used a 1350 joint, if I remember correctly.
#2, the length might be different, depending on how deep the 10 bolt pinion support is compared to the 14-bolt pinion support. I've never seen both axles side by side to know if there is a difference or not.

I've got a perfectly good 1987 3/4-ton driveshaft sitting here waiting to be scrapped. I suspect the shipping to Alaska would be a deal-breaker, though.

07-03-2021, 05:57 PM	#3
kipps Registered User Join Date: Jul 2014 Location: North-central Virginia Posts: 1,104	Re: SM465 to 700r4: Different driveshaft lengths? If I got this straight -- 1987 v10 complete drivetrain and driveshaft. 1984 k20 chassis and axles. The 1984 sm465 doesn't factor in at all. The only potential problem I see is where the 1/2-ton driveshaft connects to the 3/4-ton axle. #1, you "might" need a conversion joint. A 1987 3/4-ton used a 1350 joint, if I remember correctly. #2, the length might be different, depending on how deep the 10 bolt pinion support is compared to the 14-bolt pinion support. I've never seen both axles side by side to know if there is a difference or not. I've got a perfectly good 1987 3/4-ton driveshaft sitting here waiting to be scrapped. I suspect the shipping to Alaska would be a deal-breaker, though. __________________ 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!