The 1947 - Present Chevrolet & GMC Truck Message Board Network

Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board


Thread Tools Display Modes
Old 04-06-2004, 09:27 AM   #1
Registered User
Join Date: Jan 2002
Location: cornville, maine
Posts: 657
Rear spring perch width on HO72&14 bolt

I remember a discussion on swapping a newer 14 bolt axle under a 3/4 or 1 ton single rear wheel truck. Now I cant find it.
Anyone know where the thread is, or, instead, how much is involved in the swap?
jku Cornville, Maine
70 C30 CST Longhorn(402/TH400 4.10; 12mpg)
68 C10 burb(350 4 spd 3.07; 18 mpg)
62 C10 Stepside(283 4 spd, 3.38 19mpg)
42 Willys MB
70 Chevelle Wagon(SS 454 creation)
46 Dodge WF-32 1.5 ton
jku72 is offline   Reply With Quote
Old 04-06-2004, 11:11 AM   #2
Yukon Jack
Mechanically Challenged
Yukon Jack's Avatar
Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,457
The 1 ton 14 bolt will have the spring perches in the correct postion for the 67-72. The 3/4 ton spring perches will need to be moved. The measurements are 42.5" for 3/4 tons and 40.5" for 1 ton 14 bolts.

If you are swapping in a 14 bolt, which I am doing shortly on my K5, you will also need a conversion U joint and you will have to address the hard brake line placement. Beast388 has done this conversion so he has given me the above information. If he doesn't see this post, PM him for information.
1970 Blazer with a 400 sbc and 4" lift Roadworthy!
1969 K20 with a 454, a bit of lift and 35's
1980 Pontiac Trans Am, 455 Oldsmobile

Yukon Jack's Web Pages
Yukon Jack is offline   Reply With Quote
Old 04-06-2004, 08:51 PM   #3
Vince M
Senior Member
Vince M's Avatar
Join Date: Apr 2000
Location: Orlando, FL
Posts: 1,074
I put a '78 3/4 ton into my old '72 3/4 ton with very few problems. I had to...

1. Relocate the spring perches. I cut off the old ones and rewelded them in the correct location.

2. Cut off the shock mounts and reweld them in the correct location.

3. I did not have to do anything with the brake lines. Everything fit.

4. I did not have to do anything with the u-joints. Bolted right in.

5. I took the emergency cables off of the 72 and installed them into the '78 rear.

Hope this helps. There are different versions of the 14 bolt available also. Both a full-floating and a semi-floating. There will be differences between them and again between different years.
68 Chevy CST SWB w/LS1, carb & 700r4. Golden Anniversary with a few improvements.
Vince M is offline   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -4. The time now is 06:32 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2015, vBulletin Solutions, Inc.
Copyright 1997-2013