C10 vs C20 automatic driveshaft differences ??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Green Machine** · 02-08-2009, 09:50 PM

Need a spare driveshaft for our 1970 LWB C10. Need one to shorten the front half 3/4 inch for a tranny swap, and want to save the old one. It uses the common TH350/3 speed V8 length shaft. We have a 1972 LWB C20 parts truck, V8, TH350 that is burried with about 3 feet of snow around it right now.

I am pretty sure it uses the same style small hanger bearing, and that the front half of the shaft would be the same. I am thinking that the rear half may have a different size rear U joint or the rear length may be different because of the Eaton rear end.

Anyone know for sure ? I don't want to freeze my rear off and dig through snow just to find out it won't work. Thanks.

**Green Machine** · 02-09-2009, 03:07 PM

Any ideas ?

Longhorn Man · 02-09-2009, 04:47 PM

you are more probably right on both acounts... shorter shaft and larger U joint.

02-08-2009, 09:50 PM	#1
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	C10 vs C20 automatic driveshaft differences ??? Need a spare driveshaft for our 1970 LWB C10. Need one to shorten the front half 3/4 inch for a tranny swap, and want to save the old one. It uses the common TH350/3 speed V8 length shaft. We have a 1972 LWB C20 parts truck, V8, TH350 that is burried with about 3 feet of snow around it right now. I am pretty sure it uses the same style small hanger bearing, and that the front half of the shaft would be the same. I am thinking that the rear half may have a different size rear U joint or the rear length may be different because of the Eaton rear end. Anyone know for sure ? I don't want to freeze my rear off and dig through snow just to find out it won't work. Thanks. __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 Last edited by Green Machine; 02-08-2009 at 09:52 PM.

02-09-2009, 03:07 PM	#2
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	Re: C10 vs C20 automatic driveshaft differences ??? Any ideas ? __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0

02-09-2009, 04:47 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: C10 vs C20 automatic driveshaft differences ??? you are more probably right on both acounts... shorter shaft and larger U joint.



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