Driveshaft Bearing Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crasten123 · 04-07-2008, 07:20 PM

Hello,

I've just lowered my 72 SWB fleetside (4.5/6) and noticed when accelerating the truck vibrates a bit. Could this be a problem with the driveshaft angle, as well as the center driveline bearing? Anyone experience this problem? Has anyone changed their driveline bearing to the newer polyurathane bearing by CPP?

Ct

Longhorn Man · 04-07-2008, 09:25 PM

is the shaft phased properly?

crasten123 · 04-07-2008, 09:53 PM

Sorry, not sure what that means?

eric67m · 04-07-2008, 11:45 PM

Do you need to phase all 2 piece driveshafts? My 67 K10 has a 2 piece drive shaft. It is a corse spline (manual transmission) and if I rotate it 4 splines like the Haynes manual says it is basically rotated 180 deg IIRC.

brad_man_72 · 04-08-2008, 12:52 AM

all 2+ piece driveshafts have to be put together the same way they were ballanced or they WILL vibrate. but if all you did was lower it, the rear driveshaft may be bottomed out/too short. the factory style carrier bearing is a good design/exelent with a little bracing.

Longhorn Man · 04-08-2008, 04:20 AM

I can't explain it... when you slide the second shaft onto the first, you have to make sure the ears are in line with each other.

eric67m · 04-08-2008, 07:29 AM

Quote:

Originally Posted by Longhorn Man

I can't explain it... when you slide the second shaft onto the first, you have to make sure the ears are in line with each other.

Thats what I always thought was funny. My Haynes manual says to line them up and then rotate the rear shaft 4 splines to the left. From what I remember it is 180 deg off from where you started. I have never had any vibrations but have plenty of slop. Im not sure if my slop is the slip joint or the trans/transfer connector. I just never figured out the phasing or had any problems on my 4x4. I kind of assumed it was a auto tranny fine spline thing?

Longhorn Man · 04-08-2008, 12:30 PM

wow... never heard of that one.

neonlarry · 04-08-2008, 01:32 PM

You said you just lowered it 6", did you put in an adjustable track bar? If not your driveshaft angle is probably of to the side and that could be causing your problem.

crasten123 · 04-09-2008, 06:20 AM

I do have an adjustable traction bar that I installed. I will double check to see if the rearend is centered correctly.

neonlarry · 04-09-2008, 10:14 PM

Traction bar or panhard bar?
Also I have been using the poly carrier bearing (from inline drive) for a few years, factory replacements would only last me a few months.

ChevLoRay · 04-10-2008, 12:48 AM

Traction Bar is not the same as a Panhard Rod. One panhard rod keeps the rear end in place from side-to-side. Traction bars are located on each side of the rear end and their intent is to maintain traction under "hard" acceleration conditions. A coil spring rear end will need a panhard rod, but it may not need traction bars. Leaf spring rearends don't use panhard rods, but may need traction bars.

70 longbed · 04-10-2008, 12:55 AM

neon larry,

Looking for a website for inline drive. It did not come up on google; can you help me out?

Keith

neonlarry · 04-10-2008, 03:46 AM

My bad its inland empire:
http://www.iedls.com/bearings.html

crasten123 · 04-10-2008, 07:20 AM

i did install a panhard bar from cpp (my mistake). It sounds like its best to change the center bearing to the newer polyuretane version. Also, I may need to center the rearend since its lowered. Is there a technique to centering the rearend?

04-07-2008, 07:20 PM	#1
crasten123 Registered User Join Date: Mar 2008 Location: San Jose, ca Posts: 157	Driveshaft Bearing Question Hello, I've just lowered my 72 SWB fleetside (4.5/6) and noticed when accelerating the truck vibrates a bit. Could this be a problem with the driveshaft angle, as well as the center driveline bearing? Anyone experience this problem? Has anyone changed their driveline bearing to the newer polyurathane bearing by CPP? Ct

04-07-2008, 09:25 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Driveshaft Bearing Question is the shaft phased properly?

04-07-2008, 09:53 PM	#3
crasten123 Registered User Join Date: Mar 2008 Location: San Jose, ca Posts: 157	Re: Driveshaft Bearing Question Sorry, not sure what that means?

04-07-2008, 11:45 PM	#4
eric67m Registered User Join Date: Apr 2005 Location: Monroe, WA Posts: 298	Re: Driveshaft Bearing Question Do you need to phase all 2 piece driveshafts? My 67 K10 has a 2 piece drive shaft. It is a corse spline (manual transmission) and if I rotate it 4 splines like the Haynes manual says it is basically rotated 180 deg IIRC. __________________ 67 K10, lwb, fleetside, 327, 4spd, 205, cab and 3/4 frame swap, 14 bolt, big window, and a "rustoleum roll job" Last edited by eric67m; 04-07-2008 at 11:46 PM.

04-08-2008, 12:52 AM	#5
brad_man_72 the boat guy Join Date: Jul 2007 Location: springfield mo Posts: 2,339	Re: Driveshaft Bearing Question all 2+ piece driveshafts have to be put together the same way they were ballanced or they WILL vibrate. but if all you did was lower it, the rear driveshaft may be bottomed out/too short. the factory style carrier bearing is a good design/exelent with a little bracing. __________________ 67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project,

04-08-2008, 04:20 AM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Driveshaft Bearing Question I can't explain it... when you slide the second shaft onto the first, you have to make sure the ears are in line with each other.

04-08-2008, 12:30 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Driveshaft Bearing Question wow... never heard of that one.

04-08-2008, 01:32 PM	#9
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,746	Re: Driveshaft Bearing Question You said you just lowered it 6", did you put in an adjustable track bar? If not your driveshaft angle is probably of to the side and that could be causing your problem. __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

04-09-2008, 06:20 AM	#10
crasten123 Registered User Join Date: Mar 2008 Location: San Jose, ca Posts: 157	Re: Driveshaft Bearing Question I do have an adjustable traction bar that I installed. I will double check to see if the rearend is centered correctly.

04-09-2008, 10:14 PM	#11
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,746	Re: Driveshaft Bearing Question Traction bar or panhard bar? Also I have been using the poly carrier bearing (from inline drive) for a few years, factory replacements would only last me a few months. __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

04-10-2008, 12:48 AM	#12
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: Driveshaft Bearing Question Traction Bar is not the same as a Panhard Rod. One panhard rod keeps the rear end in place from side-to-side. Traction bars are located on each side of the rear end and their intent is to maintain traction under "hard" acceleration conditions. A coil spring rear end will need a panhard rod, but it may not need traction bars. Leaf spring rearends don't use panhard rods, but may need traction bars. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

04-10-2008, 12:55 AM	#13
70 longbed Senior Member Join Date: Oct 2002 Location: Sierra Vista, AZ Posts: 490	Re: Driveshaft Bearing Question neon larry, Looking for a website for inline drive. It did not come up on google; can you help me out? Keith __________________ Keith 70 CST longbed in progress. Hoping to get it back on the road soon.

04-10-2008, 03:46 AM	#14
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,746	Re: Driveshaft Bearing Question My bad its inland empire: http://www.iedls.com/bearings.html __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

04-10-2008, 07:20 AM	#15
crasten123 Registered User Join Date: Mar 2008 Location: San Jose, ca Posts: 157	Re: Driveshaft Bearing Question i did install a panhard bar from cpp (my mistake). It sounds like its best to change the center bearing to the newer polyuretane version. Also, I may need to center the rearend since its lowered. Is there a technique to centering the rearend?



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