Vibration/grinding after lift. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hAetWagon · 08-17-2005, 05:49 PM

I did not perform the transfer case drop and I think I might need to lengthen the driveshaft.At highway speeds it vibrates like hell.
On another note it started leaking oil like a sieve and if I make a right turn at speed it leaves a trail of smoke.
I am so dropping in another motor(or at least yanking this one.). I tire of working on crap while still on the rig.
Thoughts? Suggestions for rebuilt motors in the Norcal area?
ball park price would be cool as well.

2wdBlazer · 08-17-2005, 10:53 PM

How big is the lift? Did you change the rear pinion angle?

**special-K** · 08-17-2005, 10:55 PM

First of all,need more info.What vehicle is it?How much lift?Slip-yoke?

hAetWagon · 08-26-2005, 09:22 PM

It's a 6" lift. I don't even know how I would go about changing the rear pinion angle.
(My guess is cutting the mounts off and rewelding them at a different angle.)
So "No"
It's an 82 K5 Blazer.
Slip Yoke? I am only aware of one type.
Yeah. New to Domestic trucks at this level.

**hilljob26** · 08-26-2005, 11:20 PM

does it have blocks on the rear,if so,they should be tapered to correct the pinion angle,i have a 6 inch on mine and dont have a tranny drop,not sure if you need it or not

hAetWagon · 08-27-2005, 02:15 PM

They are tapered. SO yes.The vibration HAS to be driveline related. Did you extend your driveshaft?

**Richard** · 08-27-2005, 07:10 PM

Sorry this is going to be a bit long.

Extending your driveshaft has absolutly nothing to do with the vibration. As a matter of fact I have seen quite a few drivelines destroyed because the drivelines were extended when they did not need to be.

Jack up the truck by the frame and let the axle hang at full droop, if there is at least an inch of engagement at full droop you are fine.

hilljob26 looks like he has a longbed, so DL (drive line) angle would most likely not be a problem. I had an 85 shortbed with custom built 10" springs all the way around. The Blazer has an even shorter DL than the short bed so that may be your problem. You should be fine though.

Things to check (not in any particular order): Slip yoke- is the slip section in the drive shaft or does the end of the drive shaft slide into the TC (transfercase) tailshaft. Check for slop at the tailshaft or slipjoint.

Did you pull the driveshaft apart during the lift? U-joints may be out of phase, they must line up with each other.

U-joints may be shot, be sure to use a quality unit such as Spicer they have more bearings in the u-joint than the cheapies.

You can buy some degree shims from Superlift that bolt onto the spring pack with a new center bolt. Try lining the lower u-joint directly into the driveline or just below it.

Intall the TC drop.

Hope this may help

hAetWagon · 11-02-2005, 07:29 PM

Back from the dead.
I had a custom double cage Driveshaft made. It's a beast.
(I'm committed to the damn truck now, was pricy.)
The Vibration has ceased.
After performing the lift the angle was too extreme for the u-joints to handle, also: The driveshaft was not long enough and the slip yoke was sticking out too far.
The vibration issues have been rectified. Now on to the spewing oil.
Thanks to everyone for the input. I've been away a while.

08-17-2005, 05:49 PM	#1
hAetWagon Schlongbed MEMBER (heh)#15 Join Date: Jun 2005 Location: Sacramento Posts: 232	Vibration/grinding after lift. I did not perform the transfer case drop and I think I might need to lengthen the driveshaft.At highway speeds it vibrates like hell. On another note it started leaking oil like a sieve and if I make a right turn at speed it leaves a trail of smoke. I am so dropping in another motor(or at least yanking this one.). I tire of working on crap while still on the rig. Thoughts? Suggestions for rebuilt motors in the Norcal area? ball park price would be cool as well. Last edited by hAetWagon; 08-17-2005 at 05:52 PM.

08-17-2005, 10:53 PM	#2
2wdBlazer The Blazer King Join Date: Sep 2000 Location: Valrico, Fl (Tampa) Posts: 1,213	How big is the lift? Did you change the rear pinion angle? __________________ 72 2wd Blazer. Its the superbichinest, megacoolinest, superflowinest.

08-17-2005, 10:55 PM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,862	First of all,need more info.What vehicle is it?How much lift?Slip-yoke? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

08-26-2005, 11:20 PM	#5
hilljob26 Registered User Join Date: Dec 2004 Location: Gypsum Kansas 67448 Posts: 1,681	does it have blocks on the rear,if so,they should be tapered to correct the pinion angle,i have a 6 inch on mine and dont have a tranny drop,not sure if you need it or not __________________ 21 2500hd duramax 58 apache HILLJOB GRAPHIX--for all your graphic needs My build thread http://67-72chevytrucks.com/vboard/s...d.php?t=542497 LS ENGINE SWAP INFORMATION THREAD http://67-72chevytrucks.com/vboard/s...d.php?t=377348 4l60 to an NP205 http://67-72chevytrucks.com/vboard/s...43#post3697343

08-27-2005, 07:10 PM	#7
Richard Senior Member Join Date: Dec 1999 Location: Southern California Posts: 2,752	Sorry this is going to be a bit long. Extending your driveshaft has absolutly nothing to do with the vibration. As a matter of fact I have seen quite a few drivelines destroyed because the drivelines were extended when they did not need to be. Jack up the truck by the frame and let the axle hang at full droop, if there is at least an inch of engagement at full droop you are fine. hilljob26 looks like he has a longbed, so DL (drive line) angle would most likely not be a problem. I had an 85 shortbed with custom built 10" springs all the way around. The Blazer has an even shorter DL than the short bed so that may be your problem. You should be fine though. Things to check (not in any particular order): Slip yoke- is the slip section in the drive shaft or does the end of the drive shaft slide into the TC (transfercase) tailshaft. Check for slop at the tailshaft or slipjoint. Did you pull the driveshaft apart during the lift? U-joints may be out of phase, they must line up with each other. U-joints may be shot, be sure to use a quality unit such as Spicer they have more bearings in the u-joint than the cheapies. You can buy some degree shims from Superlift that bolt onto the spring pack with a new center bolt. Try lining the lower u-joint directly into the driveline or just below it. Intall the TC drop. Hope this may help __________________ Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746

08-26-2005, 09:22 PM	#4
hAetWagon Schlongbed MEMBER (heh)#15 Join Date: Jun 2005 Location: Sacramento Posts: 232	It's a 6" lift. I don't even know how I would go about changing the rear pinion angle. (My guess is cutting the mounts off and rewelding them at a different angle.) So "No" It's an 82 K5 Blazer. Slip Yoke? I am only aware of one type. Yeah. New to Domestic trucks at this level.

08-27-2005, 02:15 PM	#6
hAetWagon Schlongbed MEMBER (heh)#15 Join Date: Jun 2005 Location: Sacramento Posts: 232	They are tapered. SO yes.The vibration HAS to be driveline related. Did you extend your driveshaft?

11-02-2005, 07:29 PM	#8
hAetWagon Schlongbed MEMBER (heh)#15 Join Date: Jun 2005 Location: Sacramento Posts: 232	Re: Vibration/grinding after lift. Back from the dead. I had a custom double cage Driveshaft made. It's a beast. (I'm committed to the damn truck now, was pricy.) The Vibration has ceased. After performing the lift the angle was too extreme for the u-joints to handle, also: The driveshaft was not long enough and the slip yoke was sticking out too far. The vibration issues have been rectified. Now on to the spewing oil. Thanks to everyone for the input. I've been away a while.



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