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73-87 Chevy _ GMC Trucks => Brakes, Frame, Steering & Suspension => Topic started by: fjnagy on April 08, 2009, 11:35:01 pm

Title: 2WD to 4WD coversion
Post by: fjnagy on April 08, 2009, 11:35:01 pm

   Hello everyone,new to the forum,not sure if this is were i need to go to ask a few questions.
I have a 1985 GMC Sierra 3/4 ton long bed that came from the factory as Propane powered.The powertrain
is a 5.7 litre V8 with the th400 automatic 2WD.

  I would like to convert it to 4WD.I also have a 1989 4x4 fullsize Blazer that i would like to use as the parts vehicle.Since i basically have all the parts that i need,what is required from there.   

Title: Re: 2WD to 4WD coversion
Post by: fitz on April 08, 2009, 11:44:59 pm

I would just get a 4x4 frame. Many people have converted a 2WD frame to 4WD but I think you will find that it's more trouble than it's worth.

Title: Re: 2WD to 4WD coversion
Post by: Captkaos on April 09, 2009, 12:03:06 am

You will need every bracket off the front and rear of the Blazer Frame taken off an installed on the truck.  I would suggest using the 1/2T running gear if you don't want to have 2 sets of tires.  You will also have to use the transmission and T-case from the Blazer and you will have to get a rear driveshaft made.

It would probably be easier to find a 3/4T donor 4x4 and just swap the 2WD engine over if that is what you are hoping on keeping.  It is not a simple task.