2pc driveshaft to 1pc - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chris mc bride · 07-19-2025, 10:38 PM

Like to do away with two piece driveshaft in Panel and replace with one piece.
Looking into it only negative was alignment trans to rear and vibration at high spd. The later is bigger concern since I have been know to multiply spd limits.

Have no problem with going bigger diameter shaft if does away with carrier bearing , bracket and all the extra to have two piece. Has to be less weight and probably less rotating weight in long run. Plus front shaft would have to be shortened for transmission swap 3spd to 4 spd auto.

Wondering who here has done so and thoughts either way.

HO455 · 07-20-2025, 10:06 AM

I converted the factory 1/2 ton carrier to an aftermarket billet bearing with a splined slider in the rear drive shaft. Was smooth as silk with no vibrations. It was replaced after I removed the T400 installed a T350 with Gearvendor. At that point I went to a single drive line which works good also. The WMB has been over 85 mph with both setups.

The vibration issues I've experienced have been solved by first replacing the 100k mile original carrier bearing. Followed by rebuilding the rear axle, followed by replacing the yoke on the pinon gear. The factory carrier bearing contributed the least amount to the total vibrations I was experiencing. The rear axle rebuilding solve the largest portion of the vibrations. That was due to the posi carrier was disintegrating into small pieces and being ground up by the gears.

The billet bearing conversion starts on post 312 and continues on the next page.

https://67-72chevytrucks.com/vboard/...698377&page=13

The single driveline set up starts on post 671. The billet 2 piece failure is earlier on the page but it's failure was due to being improperly shortened by the drive line shop to fit the Gearvendor.

https://67-72chevytrucks.com/vboard/...698377&page=27

chris mc bride · 07-21-2025, 07:26 PM

My Z/28 has had a vibrations at 95 from day one..Guy at dealership asked why going 95, When informed him it went away at 135 he reaction was funny as hell. then told him it has 150 on speedo and should not vibrate till after that but does not even at 170. Kind of same reaction .LOL

Panel has not really had vibration I have noticed and that was with speedo on mph. Then with bouncing from no suspension I probably would not have noticed it.

07-19-2025, 10:38 PM	#1
chris mc bride Registered User Join Date: Aug 2008 Location: greensboro nc Posts: 895	2pc driveshaft to 1pc Like to do away with two piece driveshaft in Panel and replace with one piece. Looking into it only negative was alignment trans to rear and vibration at high spd. The later is bigger concern since I have been know to multiply spd limits. Have no problem with going bigger diameter shaft if does away with carrier bearing , bracket and all the extra to have two piece. Has to be less weight and probably less rotating weight in long run. Plus front shaft would have to be shortened for transmission swap 3spd to 4 spd auto. Wondering who here has done so and thoughts either way. __________________ Only the stupid know too much to learn something new.

07-20-2025, 10:06 AM	#2
HO455 Registered User Join Date: Feb 2016 Location: Portland Oregon Posts: 12,406	Re: 2pc driveshaft to 1pc I converted the factory 1/2 ton carrier to an aftermarket billet bearing with a splined slider in the rear drive shaft. Was smooth as silk with no vibrations. It was replaced after I removed the T400 installed a T350 with Gearvendor. At that point I went to a single drive line which works good also. The WMB has been over 85 mph with both setups. The vibration issues I've experienced have been solved by first replacing the 100k mile original carrier bearing. Followed by rebuilding the rear axle, followed by replacing the yoke on the pinon gear. The factory carrier bearing contributed the least amount to the total vibrations I was experiencing. The rear axle rebuilding solve the largest portion of the vibrations. That was due to the posi carrier was disintegrating into small pieces and being ground up by the gears. The billet bearing conversion starts on post 312 and continues on the next page. https://67-72chevytrucks.com/vboard/...698377&page=13 The single driveline set up starts on post 671. The billet 2 piece failure is earlier on the page but it's failure was due to being improperly shortened by the drive line shop to fit the Gearvendor. https://67-72chevytrucks.com/vboard/...698377&page=27 __________________ 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

07-21-2025, 07:26 PM	#3
chris mc bride Registered User Join Date: Aug 2008 Location: greensboro nc Posts: 895	Re: 2pc driveshaft to 1pc My Z/28 has had a vibrations at 95 from day one..Guy at dealership asked why going 95, When informed him it went away at 135 he reaction was funny as hell. then told him it has 150 on speedo and should not vibrate till after that but does not even at 170. Kind of same reaction .LOL Panel has not really had vibration I have noticed and that was with speedo on mph. Then with bouncing from no suspension I probably would not have noticed it. __________________ Only the stupid know too much to learn something new.



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