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#1 |
Registered User
Join Date: Mar 2010
Location: Grand Island, Nebraska
Posts: 106
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Lowering 6" in rear....shim?
I'm lowering the rear 6 inches in my 70 swb. I was wondering what degree of shim I would need. Thanks guys
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1970 Chevy C10 shortbox- 454 1970 Chevy Nova- 383 1987 Grand National |
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#2 |
Registered User
![]() Join Date: Jan 2011
Location: Chattanooga TN
Posts: 6,208
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Re: Lowering 6" in rear....shim?
I would say ~4 deg. Coil springs or leaf rear?
I have two C10s and one S10 I have used these blocks and shims, and I wouldn't buy them from anyone else. http://www.jagsthatrun.com/Pages/Par...lignShims.html Not my site just a highly recommended vendor. they sell shims, blocks, Ubolts, etc. Anything you need. Hope this helps.
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Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 *Currently underway* 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet *Sold* 1985 Silverado Short Fleet *Sold* 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride) |
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#3 |
Tot Roddin'
Join Date: Apr 2005
Location: Mid-MO
Posts: 24,461
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Re: Lowering 6" in rear....shim?
Curious why you're needing a shim. Lowered mine with a 6" drop spring with new u-bolts and didn't have any issues. Also, don't forget the shock relocator's...
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-Nate ![]() 1969 CST SWB - Project Blank Slate (4.5/6" ECE Static Drop, 6-lug disc brake upgrade (manual), Billet Specialties Vintec 20x8.5 255/40 (F) 20x10 295/40 (R), 250 I-6) 1960 AMF Skylark - Tot Roddin' (Lowered with custom frame; soon to include custom push bar and interior) 2008 Silverado CrewCab 1LT (5.3L, 3:73, 4x4, LT1, Z-71, Towing Package) |
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#4 | |
Registered User
![]() Join Date: Mar 2010
Location: tulsa,ok
Posts: 1,085
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Re: Lowering 6" in rear....shim?
Quote:
x-2 ... Mine is lowered 7" in the rear with no shims and no issues.
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MY BUILD THREAD http://67-72chevytrucks.com/vboard/s...d.php?t=423629 1969 custom/10 swb--SOLD 1968 swb 50th anniv.--SOLD 1967 camaro ss/rs..LS-6-speed, 16-year long project 1956 chevy nomad 1955 chevy 210 2-dr sedan 1978 el-camino ss 1-owner |
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#5 |
Registered User
![]() Join Date: Jan 2011
Location: Chattanooga TN
Posts: 6,208
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Re: Lowering 6" in rear....shim?
With C10s and / or the trailing arm suspension setup it may not be something 'required' to run however on my S10 ext cab (2.85" rear drop) I had to run a 3 deg shim to pull the pinion back around to factory spec. (It's actrually better than factory). It's just a safety thing to make sure when the geometry changes my bet would be the pinion angle would change a bit too. It may not be something noticable on the C10s (?) This is my first time building one.. Personally I plan to spec mine to 1 deg neg at the pinion. If it takes a shim, so be it. If not.. Even better. Out of curiosity, Nate (or X2). With a 6 or 7" drop and no shim, where does it put the pinion in relation to the drive shaft / U joint? I don't know, just wondering.. It may not be something even needed on the C10's. In no way doubting you guys.. Just trying to learn the C10s.
With my experience (Lifted Jeeps, dropped S10) Pinion angle has been something to consider and it may not be necessary on the trailing arms (?). Cool stuff man. Later Posted via Mobile Device
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Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 *Currently underway* 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet *Sold* 1985 Silverado Short Fleet *Sold* 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride) |
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#6 |
Registered User
Join Date: Apr 2000
Location: Bonne Terre, Mo
Posts: 3,005
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Re: Lowering 6" in rear....shim?
I could be wrong but was at the understanding that 6 is the exact max limit recommended before needing pinon angle adjustment due to possible early failure rates. Can anyone clear this issue up? Two piece shaft might also play a huge factor also. Shock relocating mounts would be almost a must do.
If so that would explain why some see as a non-issue others do..???
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'69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629" |
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#7 |
Senior Moment
![]() Join Date: Mar 2002
Location: Pittsburg Ca
Posts: 4,138
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Re: Lowering 6" in rear....shim?
I have a short bed with a 6" drop and a 1 pieace drive shaft and Ford 9". With out the 4deg shim I got a vibration. Just my 2c
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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 |
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#8 |
Just a car guy
Join Date: Feb 2006
Location: New Washington, IN
Posts: 991
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Re: Lowering 6" in rear....shim?
Get an angle finer, and measure you pinion angle, and tailshaft angle. Thats the only way to know if and how much shim you need.
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1955 belair Blown Pro Street cruiser 1971 Camaro Pro Touring 1973 Vega Drag Car 1970 C20 tow rig |
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#9 |
Registered User
Join Date: Jun 2000
Location: Festus, Missouri
Posts: 1,005
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Re: Lowering 6" in rear....shim?
No shim on my bagged truck but there is a certain height that if I am driving at 45 there is obvious out of balance noise but just a flick of a switch and it's gone...
Posted via Mobile Device
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*SOLD* 1968 Chevy SWB Fleet 350/350 combo Tach/tilt/buddy buckets Bagged/18" Wheels Black on Black ![]() Project "Pandemic" the Farm Rat 1927 Chevy Capitol Truck Rat rod '30 Model A Frame Dual Carb 5.3 LS http://www.67-72chevytrucks.com/vboa...d.php?t=804162 2007 GMC 4 DOOR 2WD BUILT 5.3 STAGE 3 CAM 93 TUNE LIFTED 22X12 WHEELS 33" TIRES 2023 Jeep RENEGADE Wifes ride |
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#10 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,005
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Re: Lowering 6" in rear....shim?
bingo.
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man |
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#11 |
Just a car guy
Join Date: Feb 2006
Location: New Washington, IN
Posts: 991
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Re: Lowering 6" in rear....shim?
Should be finder not finer.
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1955 belair Blown Pro Street cruiser 1971 Camaro Pro Touring 1973 Vega Drag Car 1970 C20 tow rig |
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