14 bolt rear in a 68 ???'s - The 1947 - Present Chevrolet & GMC Truck Message Board Network

WHITE-NOISE · 11-24-2010, 08:14 PM

well im basically doing a frame up build on my 68 4x4 longbed, first i started with a nice set of torches and got rid of the eaton rearend and the cheezy old worn out leaf springs and the death trap closed knuckle dana 44! swapping a 60 front and 14 bolt disked rear and 1 ton 56" rear springs from an 85 military truck......well i got the springs hung and axle center back where it should be but it never dawned on me that the 68 frames are skinnier than the 80's body chevys and i have to move my spring pearches....

my question is does anyone know how much i need to the perches in...i know theres alot of people that have done this swap and im hoping someone might know the measurements, i already got rid of the old rearend or i would just measure it off that.

Mike C · 11-24-2010, 08:45 PM

Early 4x4 should be 40" spring centers. 2x4 is 42.5" center. The '73 and up one ton trucks are also 40" spring centers FWIW.

msgross · 11-24-2010, 10:49 PM

Just install your springs, center the axle and measure for the new perches.... 68 had longer rear springs than 69 and up too...

duallyjams · 11-26-2010, 10:14 AM

I have a 64,69 and 87 the frame width is the same on all of them.GM used different spring frame mounts on different years hence the perch width is different.

WHITE-NOISE · 11-26-2010, 05:40 PM

Quote:

Originally Posted by duallyjams

I have a 64,69 and 87 the frame width is the same on all of them.GM used different spring frame mounts on different years hence the perch width is different.

hmmmm, yea that would make sense! i have a set of 80's frame mounts i may throw them on and see how that works!

11-24-2010, 08:14 PM	#1
WHITE-NOISE Registered User Join Date: Jul 2010 Location: waynesville, ohio Posts: 67	14 bolt rear in a 68 ???'s well im basically doing a frame up build on my 68 4x4 longbed, first i started with a nice set of torches and got rid of the eaton rearend and the cheezy old worn out leaf springs and the death trap closed knuckle dana 44! swapping a 60 front and 14 bolt disked rear and 1 ton 56" rear springs from an 85 military truck......well i got the springs hung and axle center back where it should be but it never dawned on me that the 68 frames are skinnier than the 80's body chevys and i have to move my spring pearches.... my question is does anyone know how much i need to the perches in...i know theres alot of people that have done this swap and im hoping someone might know the measurements, i already got rid of the old rearend or i would just measure it off that.

11-24-2010, 08:45 PM	#2
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,728	Re: 14 bolt rear in a 68 ???'s Early 4x4 should be 40" spring centers. 2x4 is 42.5" center. The '73 and up one ton trucks are also 40" spring centers FWIW. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

11-24-2010, 10:49 PM	#3
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: 14 bolt rear in a 68 ???'s Just install your springs, center the axle and measure for the new perches.... 68 had longer rear springs than 69 and up too... __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

11-26-2010, 10:14 AM	#4
duallyjams Registered User Join Date: May 2007 Location: Deale Md Posts: 4,663	Re: 14 bolt rear in a 68 ???'s I have a 64,69 and 87 the frame width is the same on all of them.GM used different spring frame mounts on different years hence the perch width is different. __________________ James 63 GMC V6 4speed carryall 65 chevy swb bbw V8 auto 68 K20 327/4 speed, buddy buckets 2002 GMC CC Dually Duramax 64 GMC lwb 3/4 V6 4speed SOLD 66 GMC swb bbw buddy buckets SOLD IG duallyjams The only thing that stays the same is constant change!



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