4x4 axle swaps? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

old Chevy guy · 04-26-2007, 10:06 PM

Thanks for the replys I have a 70 k10 and am not sure what to do with it.I have other trucks all HD and thought about beefing this one up a bit as I dont have a road worthy 4x4 .I have a diffrent project truck someone else gave up on and Im pretty sure the 4x4 frame is a 76 it has dana axles and lock out hubs. also I have a diffrent frame for parts for the same given up project that I believe is an 80 both are 3/4 ton the latter also has dana but not lockout hubs I will check the measurements again.

**jerry moss** · 04-26-2007, 10:48 PM

spring perches will need to be moved in about an inch on both sides of the rear axle if its a 3/4 ton, i have 14 bolts under both my 72s and i had to move the perches on both, one shock mount also. i've heard that some one tons in the 73-up vintage have the same width on the perches but ive never measured one myself.
the front is a direct bolt in.

jimi121v · 04-26-2007, 11:16 PM

I used the rear spring and shackle hangers off the 76 3/4ton that the axels came from. The frame rails are the same distance apart, and the hangers are wider. They are also much beefier than the stock ones on my 72 c10. I bolted them to the frame with 7/16" grade-8 bolts. I used the stock 76 3/4 ton springs also, so I now have 56" rear springs, and it gave me about 3" of lift with no blocks. It turned out great, and I just had to move the one shock mount.

In the front I used the 76 front cross member with all the sway bar hardware. It doesn't fit the old mounting holes, but I just put the whole thing all together, clamped it in the frame, and drilled new holes. It sits just a tad foreword of where the stock one was. The whole project was fairly easy, even though I had to grind and drill all the rivets. I could have used a cutting torch, but I didn't want to bugger up the holes. All in all not too difficult though.

Jimi

04-26-2007, 10:06 PM	#1
old Chevy guy Registered User Join Date: Apr 2007 Location: Foster Rhode Island Posts: 1,176	Re: 4x4 axle swaps? Thanks for the replys I have a 70 k10 and am not sure what to do with it.I have other trucks all HD and thought about beefing this one up a bit as I dont have a road worthy 4x4 .I have a diffrent project truck someone else gave up on and Im pretty sure the 4x4 frame is a 76 it has dana axles and lock out hubs. also I have a diffrent frame for parts for the same given up project that I believe is an 80 both are 3/4 ton the latter also has dana but not lockout hubs I will check the measurements again.

04-26-2007, 10:48 PM	#2
jerry moss Born Psycho Join Date: Feb 2001 Location: brentwood,cal,usa Posts: 4,963	Re: 4x4 axle swaps? spring perches will need to be moved in about an inch on both sides of the rear axle if its a 3/4 ton, i have 14 bolts under both my 72s and i had to move the perches on both, one shock mount also. i've heard that some one tons in the 73-up vintage have the same width on the perches but ive never measured one myself. the front is a direct bolt in. __________________ jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA

04-26-2007, 11:16 PM	#3
jimi121v Registered User Join Date: Oct 2006 Location: milwaukie, Oregon Posts: 33	Re: 4x4 axle swaps? I used the rear spring and shackle hangers off the 76 3/4ton that the axels came from. The frame rails are the same distance apart, and the hangers are wider. They are also much beefier than the stock ones on my 72 c10. I bolted them to the frame with 7/16" grade-8 bolts. I used the stock 76 3/4 ton springs also, so I now have 56" rear springs, and it gave me about 3" of lift with no blocks. It turned out great, and I just had to move the one shock mount. In the front I used the 76 front cross member with all the sway bar hardware. It doesn't fit the old mounting holes, but I just put the whole thing all together, clamped it in the frame, and drilled new holes. It sits just a tad foreword of where the stock one was. The whole project was fairly easy, even though I had to grind and drill all the rivets. I could have used a cutting torch, but I didn't want to bugger up the holes. All in all not too difficult though. Jimi



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