Q: put 80's 3/4 ton axle's under a 71 1/2 ton 4x4? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Daubs** · 01-31-2005, 01:01 PM

Still looking for the right 71-72 long box 4x4. May have a 71 1/2 ton 4x4...will see soon.

Wondering if anyone has taken the axles from an 80's 3/4 ton and put them under a 71-72 1/2 ton 4x4? Will the leaf springs bolt right on to the 71 mounts?

What issues did you run in to?

Thanks for the feedback guys. This board has been incredibly helpful to me. D.

1969 GMC · 01-31-2005, 03:14 PM

the front axle will bolt right up (at least the spring mounts...the shock mounts may be different), but the rear wont. a rear axle from a 1 ton would bolt right up, though.

**Yukon Jack** · 01-31-2005, 03:15 PM

If you try to use the front leaf springs they will be too long unless you change the mounting location on the 71-72 frame. The axle itself will have the proper spring pad width and location. The shock mounts are in the proper location also.

I don't know about the rear spring width. The spring pad placement on the rear axle will not work. You will need to remove the spring pads and weld them on in a different location - the width is different. Also, the shock mounts on the rear axle will be wrong. If you get a 1 ton rear end, the spring pads will be in the correct location.

Mudder · 01-31-2005, 03:34 PM

You posted this same question over on the 4x4 board.

http://207.44.196.117/vboard/showthread.php3?t=138049

01-31-2005, 01:01 PM	#1
Daubs Registered User Join Date: Jan 2005 Location: Eastern Nebraska Posts: 611	Q: put 80's 3/4 ton axle's under a 71 1/2 ton 4x4? Still looking for the right 71-72 long box 4x4. May have a 71 1/2 ton 4x4...will see soon. Wondering if anyone has taken the axles from an 80's 3/4 ton and put them under a 71-72 1/2 ton 4x4? Will the leaf springs bolt right on to the 71 mounts? What issues did you run in to? Thanks for the feedback guys. This board has been incredibly helpful to me. D. __________________ '72 Chevy K-20 Crate 350, SM465, 4.10's

01-31-2005, 03:14 PM	#2
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	the front axle will bolt right up (at least the spring mounts...the shock mounts may be different), but the rear wont. a rear axle from a 1 ton would bolt right up, though. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

01-31-2005, 03:15 PM	#3
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,684	If you try to use the front leaf springs they will be too long unless you change the mounting location on the 71-72 frame. The axle itself will have the proper spring pad width and location. The shock mounts are in the proper location also. I don't know about the rear spring width. The spring pad placement on the rear axle will not work. You will need to remove the spring pads and weld them on in a different location - the width is different. Also, the shock mounts on the rear axle will be wrong. If you get a 1 ton rear end, the spring pads will be in the correct location. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

01-31-2005, 03:34 PM	#4
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	You posted this same question over on the 4x4 board. http://207.44.196.117/vboard/showthread.php3?t=138049 Last edited by Mudder; 01-31-2005 at 03:38 PM.

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