drop (flip) shackles in rear ??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

butch86 · 04-23-2012, 12:10 AM

when you install the drop shackles in the rear does it affect your pinion angle? the previous owner used the kit with the rear and drop shackles and hangers.

i will get an angle gague tomorrow i just wanna know if i need to look into the drop shackle engineering and is my pinion angle gonna be off because of this kit.

thanks yall

**lolife99** · 04-26-2012, 07:05 PM

Most of the manufactured "shackle/hanger" kits yield a 4" drop with minimal affect on pinion angle.
Do you know what brand drop parts the PO used?
Posted via Mobile Device

INSIDIOUS '86 · 04-28-2012, 01:50 PM

Have one in my rig. Everything checks out
Posted via Mobile Device

**N2TRUX** · 04-28-2012, 02:15 PM

On most 73-87's you shouldnt need to shim. With a shackle and hanger combined your driveshaft angle is increased, but the pinion angle stays about the same. Its a common issue on 88-98's but not earlier years.

04-23-2012, 12:10 AM	#1
butch86 Registered User Join Date: Mar 2012 Location: harrisville, ms Posts: 377	drop (flip) shackles in rear ??? when you install the drop shackles in the rear does it affect your pinion angle? the previous owner used the kit with the rear and drop shackles and hangers. i will get an angle gague tomorrow i just wanna know if i need to look into the drop shackle engineering and is my pinion angle gonna be off because of this kit. thanks yall __________________ most people sleep peacfully at night because, rough men stand ready to do violenceon there behalf.

04-26-2012, 07:05 PM	#2
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,690	Re: drop (flip) shackles in rear ??? Most of the manufactured "shackle/hanger" kits yield a 4" drop with minimal affect on pinion angle. Do you know what brand drop parts the PO used? Posted via Mobile Device __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

04-28-2012, 01:50 PM	#3
INSIDIOUS '86 Registered User Join Date: Jul 2009 Location: washington Posts: 4,178	Re: drop (flip) shackles in rear ??? Have one in my rig. Everything checks out Posted via Mobile Device __________________ 377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511

04-28-2012, 02:15 PM	#4
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,023	Re: drop (flip) shackles in rear ??? On most 73-87's you shouldnt need to shim. With a shackle and hanger combined your driveshaft angle is increased, but the pinion angle stays about the same. Its a common issue on 88-98's but not earlier years. __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"



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