how much pinion shim with 6" drop - 68 SWB - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jwbbuck · 07-02-2006, 12:00 PM

I'm running 4" drop springs and I'm ordering 2" drop blocks. Any guesses on how much pinion shim I may need so I can have the right stuff when I'm bolting everything back together?

**1970 CST Short Wide** · 07-02-2006, 12:15 PM

Read this it may help http://www.2quicknovas.com/happypinions.html

ChevLoRay · 07-02-2006, 12:34 PM

Are you running leaf, or coil, springs?

ECE sells 6-inch dropped coils that also mean you need to relocate the shock mounts and to replace the track bar with an adjustable one. Leaf springs don't use the track bar.

One option on coil-sprung trucks is the newly available cross member that gives a little more room for the drive shaft to move. Is your driveshaft a one or two-piece unit? 2-piece shafts have more flexibility for dropped rear ends, but can contact the crossmember, in some cases.

As far as how much to shim the rear end on a leaf-sprung vehicle, the fine point, as I understand it, are having the correct angles, both at the tail shaft on the transmission and at the pinion coupling on the rear end. One piece drive shafts may make it more difficult, or not. I have a coil spring truck, with 4-inch drop springs and I've had zero trouble with u-joints, vibrations, etc.

**special-K** · 07-02-2006, 07:38 PM

Doesn`t lowering a truck put everything more in-line?

07-02-2006, 12:00 PM	#1
jwbbuck Registered User Join Date: Nov 2005 Location: PA Posts: 18	how much pinion shim with 6" drop - 68 SWB I'm running 4" drop springs and I'm ordering 2" drop blocks. Any guesses on how much pinion shim I may need so I can have the right stuff when I'm bolting everything back together?

07-02-2006, 12:15 PM	#2
1970 CST Short Wide Senior Moment Join Date: Mar 2002 Location: Pittsburg Ca Posts: 4,098	Re: how much pinion shim with 6" drop - 68 SWB Read this it may help http://www.2quicknovas.com/happypinions.html __________________ 1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565

07-02-2006, 12:34 PM	#3
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: how much pinion shim with 6" drop - 68 SWB Are you running leaf, or coil, springs? ECE sells 6-inch dropped coils that also mean you need to relocate the shock mounts and to replace the track bar with an adjustable one. Leaf springs don't use the track bar. One option on coil-sprung trucks is the newly available cross member that gives a little more room for the drive shaft to move. Is your driveshaft a one or two-piece unit? 2-piece shafts have more flexibility for dropped rear ends, but can contact the crossmember, in some cases. As far as how much to shim the rear end on a leaf-sprung vehicle, the fine point, as I understand it, are having the correct angles, both at the tail shaft on the transmission and at the pinion coupling on the rear end. One piece drive shafts may make it more difficult, or not. I have a coil spring truck, with 4-inch drop springs and I've had zero trouble with u-joints, vibrations, etc. __________________ 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.

07-02-2006, 07:38 PM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,862	Re: how much pinion shim with 6" drop - 68 SWB Doesn`t lowering a truck put everything more in-line? __________________ "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 ~



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