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rear axle swap
#1128284 Wed Oct 07 2015 01:13 AM
Joined: May 2001
Posts: 478
K
koolkar Offline OP
Shop Shark
I've been looking but can't find a topic regarding rear axle swaps for a 1 1/2 ton. I have the 2 speed vacuum shift that is stock. I also have a 95 chevy 3500 h.d. for a donor. I want to swap the entire axle assembly and use the cross member from the 3500 so I can have rear shocks. I realize I will probably will have to rework the drive shaft but am wondering about spring perch relocation. my back is hurt right now so I can't go measure.anybody know if I will have to relocate the perches? u bolts using the stock springs?

Re: rear axle swap
koolkar #1128305 Wed Oct 07 2015 03:03 AM
Joined: May 2005
Posts: 9,146
G
.
I used the same axle from a P30 chassis and had to move the spring pads. Think the 3500hd has same frame width, still be nice to measure and check.
Had you asked this morning I could have measured a 3500hd at lunch... A friend of mine runs a junk yard and had one on the roll back as he stopped for lunch too. Just a cab and chassis, would have been real easy to measure.



1951 GMC 250 in the Project Journals [stovebolt.com]
1948 Chevrolet 6400 [stovebolt.com] - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup [stovebolt.com]
---All pictures [picasaweb.google.com]---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-
Re: rear axle swap
koolkar #1128310 Wed Oct 07 2015 03:57 AM
Joined: Jan 2008
Posts: 4,659
C
Shop Shark
I have a 2015 3500HD. The frame rails are 34". Moving spring seats is no big deal. Just cut the old ones off and weld new ones on, It doesn't have to be a particularly good weld because the U-bolts are what does the holding. What are you going to do about wheels? A driveshaft shop can make any kind of driveshaft you need and they are not very expensive.

Re: rear axle swap
koolkar #1128326 Wed Oct 07 2015 05:45 AM
Joined: May 2001
Posts: 478
K
koolkar Offline OP
Shop Shark
using the 19.5 tires and wheels. the c.o.e. already had the wheels changed when I bought it. guess i'll start calling spring shops tomorrow to try and find spring perches

Re: rear axle swap
koolkar #1128328 Wed Oct 07 2015 06:18 AM
Joined: May 2001
Posts: 478
K
koolkar Offline OP
Shop Shark

Re: rear axle swap
koolkar #1128339 Wed Oct 07 2015 12:22 PM
Joined: May 2005
Posts: 9,146
G
.
I assumed the 3500HD is one with an I-beam axle and 10 lug wheels, back when HD meant something. Seems everything now days is HD or Super Duty...

You may use the spring pads off the original axle as it, the Dana 80, and 70HD all have 4" axle tubes.


1951 GMC 250 in the Project Journals [stovebolt.com]
1948 Chevrolet 6400 [stovebolt.com] - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup [stovebolt.com]
---All pictures [picasaweb.google.com]---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-
Re: rear axle swap
Grigg #1128357 Wed Oct 07 2015 03:09 PM
Joined: May 2001
Posts: 478
K
koolkar Offline OP
Shop Shark
Originally Posted by Grigg
I assumed the 3500HD is one with an I-beam axle and 10 lug wheels, back when HD meant something. Seems everything now days is HD or Super Duty...

You may use the spring pads off the original axle as it, the Dana 80, and 70HD all have 4" axle tubes.


it is a 3500 h.d. with 10 lug 19.5 wheels. thanks for your help.

Re: rear axle swap
koolkar #1128377 Wed Oct 07 2015 05:39 PM
Joined: Jan 2008
Posts: 4,659
C
Shop Shark
Although today's 3500HD is built with a pickup cab, they have more capacity than the old 3500 with 20". The wheels are 17" duals with 8 hole metric.

https://plus.google.com/11263693037...5156051106&oid=112636930370126476644

Thee trailer has 17.5 singles that carry as much as 16" dual with a lot less rolling resistance. Although I have a CDL, the single tires keep me under the radar with DOT hassle. Most troopers haven't been taught that 17.5 singles carry more than16" duals.
The term HD with a GMC is not just a macho term. Take a look at a 2015 3500HD GMC. It amazes me how they are build, and I have been around trucks for over 50 years.

Re: rear axle swap
koolkar #1128379 Wed Oct 07 2015 05:46 PM
Joined: May 2001
Posts: 478
K
koolkar Offline OP
Shop Shark
ummmm...... about what, 16000 pounds of Emeryville there?

Re: rear axle swap
koolkar #1128396 Wed Oct 07 2015 07:30 PM
Joined: May 2005
Posts: 9,146
G
.
Yes, they're capable trucks.

With out side tracking this thread too much.. My point was if ALL the standard pickup trucks are now called "HD" and "Super Duty" then what do you call something that really is heavy duty in comparison to them? "Extra Super Duty", or "Extremely More So Heavy Duty"... I find the whole thing ironic and comical.

Grigg


1951 GMC 250 in the Project Journals [stovebolt.com]
1948 Chevrolet 6400 [stovebolt.com] - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup [stovebolt.com]
---All pictures [picasaweb.google.com]---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-
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