lowering shackles to lower 4" lifted springs?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

aggiedave98 · 06-23-2004, 11:02 PM

Well, I found out why my '89 suburban rear end is up too high after my 3" fabtech up front and 2" lifted springs in the rear----

it was a 4" lifted spring in the rear!!!

Now, I can either get the shop to get me the correct 2" springs or I can put on 2" lowering shackles that I already have on the way from a guy on the board.

What is the downside of going with the lowering shackles on 4" springs? Any upside??

crazy longhorn · 06-23-2004, 11:43 PM

The shackles will change the pinion angle somewhat(I doubt that it would be enough to cause a problem). On the upside, its a bunch less work to swap shacles vs springs.... best of luck,crazyL

Prerunner1982 · 06-23-2004, 11:49 PM

actually if i remember he is already having problems with vibration, so this actually may help the problem, i say worth a shot.

i can see you explaining this to someone asking about your lift, yeah i have 4" lift springs and 2" lowering shackles... they will be like WTF?

Fat Tom · 06-24-2004, 03:29 AM

If you switch back to 2" leafs, it'll ride nicer than with 4" leafs and 2" lowering shackles.

aggiedave98 · 06-24-2004, 09:44 AM

Yes, I did have the driveline vibration and the ujoint at the rear is actually almost inline with the differential. I think actually lowering w/ shackles may actually make my problem worse b/c it will almost make that angle upward instead of downward (if that makes sense).

That angle is because of the shims in the 4" lifted springs. I'm thinking that 4" lifted springs probably have more of a shim, so maybe the 2" will actually solve my vibration problem.

And yes, I'm going to sound really cool... "Yeah, I've got a 4" lift on my burban.... well, it doesn't look like 4" because I lowered it 2"... yeah, I'm cool like that."

06-23-2004, 11:02 PM	#1
aggiedave98 Senior Member Join Date: Aug 2003 Location: Sugar Land, TX Posts: 1,007	lowering shackles to lower 4" lifted springs?? Well, I found out why my '89 suburban rear end is up too high after my 3" fabtech up front and 2" lifted springs in the rear---- it was a 4" lifted spring in the rear!!! Now, I can either get the shop to get me the correct 2" springs or I can put on 2" lowering shackles that I already have on the way from a guy on the board. What is the downside of going with the lowering shackles on 4" springs? Any upside??

06-23-2004, 11:43 PM	#2
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	The shackles will change the pinion angle somewhat(I doubt that it would be enough to cause a problem). On the upside, its a bunch less work to swap shacles vs springs.... best of luck,crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

06-24-2004, 03:29 AM	#4
Fat Tom Registered User Join Date: May 2004 Location: Maple Ridge, B.C., Canada Posts: 42	If you switch back to 2" leafs, it'll ride nicer than with 4" leafs and 2" lowering shackles. __________________ 69 GMC 2wd 350cid 82 Toyota 4wd, 3.8L V6, 6" lift, 35's, locked and loaded 76 Datsun F10 1.4L *FOR SALE* 04 Honda Shadow 750

06-23-2004, 11:49 PM	#3
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,906	actually if i remember he is already having problems with vibration, so this actually may help the problem, i say worth a shot. i can see you explaining this to someone asking about your lift, yeah i have 4" lift springs and 2" lowering shackles... they will be like WTF?

06-24-2004, 09:44 AM	#5
aggiedave98 Senior Member Join Date: Aug 2003 Location: Sugar Land, TX Posts: 1,007	Yes, I did have the driveline vibration and the ujoint at the rear is actually almost inline with the differential. I think actually lowering w/ shackles may actually make my problem worse b/c it will almost make that angle upward instead of downward (if that makes sense). That angle is because of the shims in the 4" lifted springs. I'm thinking that 4" lifted springs probably have more of a shim, so maybe the 2" will actually solve my vibration problem. And yes, I'm going to sound really cool... "Yeah, I've got a 4" lift on my burban.... well, it doesn't look like 4" because I lowered it 2"... yeah, I'm cool like that."



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