Tranny Mounts & Driveline Vibration - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Blue85 · 03-13-2007, 07:26 PM

Got a bad vibration in my 72, narrowed it down to drivline vibes. My tranny mount (700r4) seems to making the tranny sit about a 1/2inch to the driver side. Could this be enough to cause a vibe? It is a rubber mount, can i change it to polyurethane without changing the motor mounts to poly too? Getting the shaft balanced tomorrow to really narrow it down, right now it doesn't have any wieghts on it.

Spray-Bomb · 03-13-2007, 08:02 PM

Might wanna get a new carrier bearing, just to be on the safe side

They're not that expensive & well worth no having to pull your drive-shaft again

Or do the SWB's have carrier bearings ?

I'm new to the 67-72 stuff

Blue85 · 03-13-2007, 08:39 PM

no carrier bearing, just a single shaft

Spray-Bomb · 03-13-2007, 08:39 PM

Hmm

cdowns · 03-13-2007, 09:05 PM

polyurathane mounts will increase the vibration// have you checked the pinion angle since dropping the truck? have you also checked the drireshaft yoke to make sure theres enough free play when installed in the tailshaft of the tranny?

wibilly · 03-13-2007, 09:13 PM

corvette engine and trannies sit at more of an angle than that to make room for the stearing colume so idoubt that alone is your problem. if you go with poly mounts i think you should replace all three

Blue85 · 03-15-2007, 12:54 AM

think i sourced the problem, got the shaft balanced today, and it was waaaaay out of wack, the guy was suprised that it didn't vibrate worse, seemed to think that someone had made the shaft at home. But now it snowed again so i wont be able put it back in the truck and test drive for a while.

03-13-2007, 07:26 PM	#1
Blue85 Oilfield Trash Join Date: Sep 2003 Location: Raymore, Sk, Canada, Earth Posts: 3,171	Tranny Mounts & Driveline Vibration Got a bad vibration in my 72, narrowed it down to drivline vibes. My tranny mount (700r4) seems to making the tranny sit about a 1/2inch to the driver side. Could this be enough to cause a vibe? It is a rubber mount, can i change it to polyurethane without changing the motor mounts to poly too? Getting the shaft balanced tomorrow to really narrow it down, right now it doesn't have any wieghts on it. __________________ 14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr.

03-13-2007, 08:02 PM	#2
Spray-Bomb Texas Big Wig Join Date: Jan 2007 Location: Mineola, Texas Posts: 5,620	Re: Tranny Mounts & Driveline Vibration Might wanna get a new carrier bearing, just to be on the safe side They're not that expensive & well worth no having to pull your drive-shaft again Or do the SWB's have carrier bearings ? I'm new to the 67-72 stuff __________________ Just not low enough... ----------------------------- Sinister Killer Last edited by Spray-Bomb; 03-13-2007 at 08:03 PM.

03-13-2007, 08:39 PM	#3
Blue85 Oilfield Trash Join Date: Sep 2003 Location: Raymore, Sk, Canada, Earth Posts: 3,171	Re: Tranny Mounts & Driveline Vibration no carrier bearing, just a single shaft __________________ 14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr.

03-13-2007, 08:39 PM	#4
Spray-Bomb Texas Big Wig Join Date: Jan 2007 Location: Mineola, Texas Posts: 5,620	Re: Tranny Mounts & Driveline Vibration Hmm __________________ Just not low enough... ----------------------------- Sinister Killer

03-13-2007, 09:05 PM	#5
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Tranny Mounts & Driveline Vibration polyurathane mounts will increase the vibration// have you checked the pinion angle since dropping the truck? have you also checked the drireshaft yoke to make sure theres enough free play when installed in the tailshaft of the tranny? __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY Last edited by cdowns; 03-13-2007 at 10:10 PM.

03-13-2007, 09:13 PM	#6
wibilly Senior Member Join Date: Nov 2005 Location: northwestern wi Posts: 2,111	Re: Tranny Mounts & Driveline Vibration corvette engine and trannies sit at more of an angle than that to make room for the stearing colume so idoubt that alone is your problem. if you go with poly mounts i think you should replace all three __________________ common sense isn't so common anymore

03-15-2007, 12:54 AM	#7
Blue85 Oilfield Trash Join Date: Sep 2003 Location: Raymore, Sk, Canada, Earth Posts: 3,171	Re: Tranny Mounts & Driveline Vibration think i sourced the problem, got the shaft balanced today, and it was waaaaay out of wack, the guy was suprised that it didn't vibrate worse, seemed to think that someone had made the shaft at home. But now it snowed again so i wont be able put it back in the truck and test drive for a while. __________________ 14 Dodge 3500 Mega Cab 08 Dodge 3500 Mega Cab 87 Chev 3+3 4x4 80 GMC K10 High Sierra bone stock 70 Chevelle 350SS long term project 68 GMC 3ton Grain Truck/Garbage wagon 50 Pontiac 2 Door Coupe Project "I've got a shotgun rifle and a 4 wheel drive and a country boy can survive" Hank Jr.



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