C30/3500 driveshaft identification - The 1947 - Present Chevrolet & GMC Truck Message Board Network

J01012814 · 10-22-2024, 10:15 PM

Hey everyone, had a question for anyone that may be a 1ton expert.
My '71 GMC SRW needs a new slip yoke for the 2 piece driveshaft and some repairs to the crossmember the center support bearing attaches to. I can find the CSB but not the yoke and it's causing some vibration at around 60mph.
Looking at a lot of pics and period repair manuals hasn't yielded anything quite yet. This truck has been interesting to find parts for with the 9ft bed and whatnot. Thanks for any help! Ignore the mess of an undercarriage it's since been fixed they're just the only pictures I have of the underside from right after I got it several years ago.

**HO455** · 10-23-2024, 10:54 AM

I would check for the yoke at a driveline shop. It may be that the yoke and the female part of the slip joint in the forward driveline may have to be replaced together.

**kwmech** · 10-23-2024, 10:58 AM

. ^^^Yup they need to be replaced as a set and rebalanced. Seems this is what you're looking for, not too far away
https://www.northmanufacturingkc.com/

10-22-2024, 10:15 PM	#1
J01012814 Registered User Join Date: Apr 2021 Location: Lawrence, Kansas Posts: 11	C30/3500 driveshaft identification Hey everyone, had a question for anyone that may be a 1ton expert. My '71 GMC SRW needs a new slip yoke for the 2 piece driveshaft and some repairs to the crossmember the center support bearing attaches to. I can find the CSB but not the yoke and it's causing some vibration at around 60mph. Looking at a lot of pics and period repair manuals hasn't yielded anything quite yet. This truck has been interesting to find parts for with the 9ft bed and whatnot. Thanks for any help! Ignore the mess of an undercarriage it's since been fixed they're just the only pictures I have of the underside from right after I got it several years ago. Attached Images Last edited by J01012814; 10-22-2024 at 10:21 PM.

10-23-2024, 10:54 AM	#2
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,300	Re: C30/3500 driveshaft identification I would check for the yoke at a driveline shop. It may be that the yoke and the female part of the slip joint in the forward driveline may have to be replaced together. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

10-23-2024, 10:58 AM	#3
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,602	Re: C30/3500 driveshaft identification . ^^^Yup they need to be replaced as a set and rebalanced. Seems this is what you're looking for, not too far away https://www.northmanufacturingkc.com/



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