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.

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.

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...

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.

Re: 14 bolt rear in a 68 ???'s
 

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!