Vibrations - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jesse 67 c-10 · 07-04-2002, 01:13 AM

Truck is finnaly all finished, with the exception of the new cam, running and driving great at lower speeds. When I break 2000 rpm in 5th (speedo not hooked yet, about 60mph) I get a vibration that increases with speed, nothing below that, tires were just balanced and it doesn't come from the motor so I'm thinking driveshaft, could this be from the u-joints being off angle, or is it most likely the driveshaft out of balance? any experience with this? if it is the later, how can I set up a fluid balance in my driveshaft? I heard this would work. I have a one piece shaft. Any guess on a price for getting it balanced? Thanks for the help!
Jesse

Quick68c10 · 07-04-2002, 01:20 AM

let me ask you a question of the topic how did you get the
one piece drive shaft

Jesse 67 c-10 · 07-04-2002, 01:31 AM

Measured the length, went to the local auto wreckers and picked one out from the pile of driveshafts, got adapter u-joints to fit the slip yoke and rear end, removed the center bearing bracket and did a little trimming on the cross member for clearance under the shaft, not that hard, and no more center bearing shudder upon acceleration. Being a used shaft I spose it could be out but who knows. Any help?
Thanks

Quick68c10 · 07-04-2002, 01:43 AM

sorry to throw you off of subject because min is really bothering me it vibrates all the time cause the bracket is cracked
how did you trim the whole

chevyman 68 C/10 · 07-04-2002, 02:57 AM

just pull a shaft from a 73 up if you have a short wheel base

Quick68c10 · 07-04-2002, 02:57 AM

nah long

MOTHERTRUCKERS · 07-04-2002, 09:11 AM

Have your driveshaft balanced and reset your pinion angle. The pinion angle has changed when you changed from 2pc to 1pc shaft. Also on lwb trucks it will whip at higher speeds. We have tried 1pc shafts in lwb customers trucks and finally got custom aluminum shafts to work after resetting the pinion angle, less weight less whip. Our race trucks have 2pc shafts and BRUTE FORCE brand carrier bearing and u-joints with no trouble so far, we tried 1pc in them and they shook so bad at the big end (8500 rpm with a powerglide) they broke the u-joint yoke.

Jesse 67 c-10 · 07-05-2002, 01:17 AM

my driveshaft is 68" long about, never thought about it flexing. I spose I should get it balanced profesionally. How do I reset the pinion angle though? Shims between the axle pads and control arms? This is where a 4 bar setup would be really nice! I took most of the lip off the bottom of the inside of the driveshaft loop with a cutting torch, not real pretty, but it gives the shaft all the clearance I need and it doesn't look like it should weaken it in a critical way. Anyone with any info about the fluid balance? Thanks
for the help,
Jesse

07-04-2002, 01:13 AM	#1
Jesse 67 c-10 Registered User Join Date: Feb 2000 Location: Edmonton, Alberta, Canada Posts: 599	Vibrations Truck is finnaly all finished, with the exception of the new cam, running and driving great at lower speeds. When I break 2000 rpm in 5th (speedo not hooked yet, about 60mph) I get a vibration that increases with speed, nothing below that, tires were just balanced and it doesn't come from the motor so I'm thinking driveshaft, could this be from the u-joints being off angle, or is it most likely the driveshaft out of balance? any experience with this? if it is the later, how can I set up a fluid balance in my driveshaft? I heard this would work. I have a one piece shaft. Any guess on a price for getting it balanced? Thanks for the help! Jesse __________________ Edmonton, Alberta, 67 c-10, Long fleet, front disks, 5 lug rear end, 327 with Vortechs, edlbrock manifold, comp cams XE 256, 600cfm carb. Backed by a getrag 5 speed and 1 piece driveshaft. 1993 Dihatsu Hijet Jumbo cab 4x4, currently converting to battery electric power.

07-04-2002, 01:20 AM	#2
Quick68c10 Registered User Join Date: Jun 2001 Location: San Antonio Tx Posts: 219	let me ask you a question of the topic how did you get the one piece drive shaft __________________ 68 C10 lwb Blue 350ci 4:11 gears Mine 70 c10 lwb Green all oringinal execpt for the seats and steering wheel Dad's email=TriToRemember@yahoo.com Texan

07-04-2002, 01:31 AM	#3
Jesse 67 c-10 Registered User Join Date: Feb 2000 Location: Edmonton, Alberta, Canada Posts: 599	Measured the length, went to the local auto wreckers and picked one out from the pile of driveshafts, got adapter u-joints to fit the slip yoke and rear end, removed the center bearing bracket and did a little trimming on the cross member for clearance under the shaft, not that hard, and no more center bearing shudder upon acceleration. Being a used shaft I spose it could be out but who knows. Any help? Thanks __________________ Edmonton, Alberta, 67 c-10, Long fleet, front disks, 5 lug rear end, 327 with Vortechs, edlbrock manifold, comp cams XE 256, 600cfm carb. Backed by a getrag 5 speed and 1 piece driveshaft. 1993 Dihatsu Hijet Jumbo cab 4x4, currently converting to battery electric power.

07-04-2002, 01:43 AM	#4
Quick68c10 Registered User Join Date: Jun 2001 Location: San Antonio Tx Posts: 219	sorry to throw you off of subject because min is really bothering me it vibrates all the time cause the bracket is cracked how did you trim the whole __________________ 68 C10 lwb Blue 350ci 4:11 gears Mine 70 c10 lwb Green all oringinal execpt for the seats and steering wheel Dad's email=TriToRemember@yahoo.com Texan

07-04-2002, 02:57 AM	#5
chevyman 68 C/10 Registered User Join Date: Feb 2002 Location: Gilmer, Texas USA Posts: 313	just pull a shaft from a 73 up if you have a short wheel base __________________ 69 Chevy short fleet side soon to have LT1 and 4L60E pb. ps cruise and air. 68 Chevy short fleet side 400 sb 5 inch chop top pb. ps. pw. 350 auto and shaved handles 68 anniversary no engine long wheel base 400 auto FOR SALE 68 Chevy fleet side long wheel base complete parts truck.

07-04-2002, 02:57 AM	#6
Quick68c10 Registered User Join Date: Jun 2001 Location: San Antonio Tx Posts: 219	nah long __________________ 68 C10 lwb Blue 350ci 4:11 gears Mine 70 c10 lwb Green all oringinal execpt for the seats and steering wheel Dad's email=TriToRemember@yahoo.com Texan

07-04-2002, 09:11 AM	#7
MOTHERTRUCKERS Registered User Join Date: Dec 1999 Location: BRADENTON FLA Posts: 3,269	Have your driveshaft balanced and reset your pinion angle. The pinion angle has changed when you changed from 2pc to 1pc shaft. Also on lwb trucks it will whip at higher speeds. We have tried 1pc shafts in lwb customers trucks and finally got custom aluminum shafts to work after resetting the pinion angle, less weight less whip. Our race trucks have 2pc shafts and BRUTE FORCE brand carrier bearing and u-joints with no trouble so far, we tried 1pc in them and they shook so bad at the big end (8500 rpm with a powerglide) they broke the u-joint yoke. __________________ Rest in Peace Ed. Thanks for all the good times.

07-05-2002, 01:17 AM	#8
Jesse 67 c-10 Registered User Join Date: Feb 2000 Location: Edmonton, Alberta, Canada Posts: 599	my driveshaft is 68" long about, never thought about it flexing. I spose I should get it balanced profesionally. How do I reset the pinion angle though? Shims between the axle pads and control arms? This is where a 4 bar setup would be really nice! I took most of the lip off the bottom of the inside of the driveshaft loop with a cutting torch, not real pretty, but it gives the shaft all the clearance I need and it doesn't look like it should weaken it in a critical way. Anyone with any info about the fluid balance? Thanks for the help, Jesse __________________ Edmonton, Alberta, 67 c-10, Long fleet, front disks, 5 lug rear end, 327 with Vortechs, edlbrock manifold, comp cams XE 256, 600cfm carb. Backed by a getrag 5 speed and 1 piece driveshaft. 1993 Dihatsu Hijet Jumbo cab 4x4, currently converting to battery electric power.



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