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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: mreynolds on February 09, 2011, 05:47:24 PM

Title: 1988 3/4ton , 1ton differences
Post by: mreynolds on February 09, 2011, 05:47:24 PM

I have a 1988 1 ton 2wd srw truck that I really like, but hate the rear gear ratio.(4.10) I drive only on the street and need higher gears. I thought I might be able to swap in a 6lug rear axle and swap the front rotors over to 6lug, but some around hear say you can't do that on a 1ton. 3/4 ton trucks they say you can. What is the big differences between a 1ton and 3/4 ton?

Title: Re: 1988 3/4ton , 1ton differences
Post by: Captkaos on February 09, 2011, 06:21:01 PM

If you have a donor you should be able to swap everything over.  You can put 1 tons under a half ton so mounting isnt the big issue on the rear.  For the front, the spindles out I believe are different and require 3/4T ball joints out....

Title: Re: 1988 3/4ton , 1ton differences
Post by: Blazin on February 09, 2011, 10:30:43 PM

Seems like it would be allot less work to just swap in a higher geared rear, or swap the gears in yours?

Title: Re: 1988 3/4ton , 1ton differences
Post by: Da67goatman on February 10, 2011, 07:01:49 AM

Blazin:  That's what I am trying to do, but finding higher gears is near impossible.  No aftermarket support, so you have to look all over for a used set.

Title: Re: 1988 3/4ton , 1ton differences
Post by: Irish_Alley on February 10, 2011, 10:11:13 AM

What rear is it

Title: Re: 1988 3/4ton , 1ton differences
Post by: Sartobuilt on February 10, 2011, 11:24:04 AM

Is this an R/V truck or C/K? The spring pads and shock mounts are diffrent on the R/V frame, So I dont think its a direct swap Capt.

Title: Re: 1988 3/4ton , 1ton differences
Post by: Captkaos on February 10, 2011, 11:30:34 AM

A 1 Ton would have a 14 Bolt Full float
There is plenty of support for it:
http://www.ringpinion.com/PartsList.aspx?SearchMode=Make&MakeID=3&ModelID=475&Side=Rear&DriveType=RWD&DiffID=194&CatID=35

Title: Re: 1988 3/4ton , 1ton differences
Post by: mreynolds on February 10, 2011, 03:09:38 PM

it is a c3500. I have found a 3.42 14bolt out of a 3/4 ton, but the spring pads are wider.

Title: Re: 1988 3/4ton , 1ton differences
Post by: zieg85 on February 10, 2011, 04:06:15 PM

Is it a crew cab?

Title: Re: 1988 3/4ton , 1ton differences
Post by: Da67goatman on February 10, 2011, 09:21:39 PM

Yeah capt your right, I should have rephrased that.  Not much Affordable aftermarket support.

Title: Re: 1988 3/4ton , 1ton differences
Post by: acefoxx on February 11, 2011, 09:54:47 AM

Check out the market for a semi floating 14 bolt. Think I found 2 lockers for mine $500 + each.

Title: Re: 1988 3/4ton , 1ton differences
Post by: Blue 82 on February 14, 2011, 04:03:47 PM

Just swap the 8 bolt SRW rear
I found a bunch in your state
*Edited/link inop

Try this search
Just fill in your vehicle info
www.car-part.com
I think you need the GU6 rear