1990 3/4 ton Duramax swap

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codeman

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Joined
Feb 22, 2024
Posts
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Location
WI
First Name
Cody
Truck Year
1990
Truck Model
GMC
Engine Size
5.7
I’m considering swapping a duramax into my my concern is will the frame support it or would I be better off dropping the body onto a 2012 2500 frame and having a shop Duramax Specialties install the drive train.
 

TheFishBox

Full Access Member
Joined
Jul 30, 2016
Posts
241
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240
Location
OR
First Name
nick
Truck Year
1987
Truck Model
v30
Engine Size
6.0 ls
The frame will be fine. Precision fabrication plus has the majority of the stuff needed. Be ready to drop a ton of cash and either be able to fab stuff or drop even more cash to pay someone else to do it.

I’m balls deep in my swap, hemorrhaging money with the faintest glimmer of an ending in site but also a complete shop of squarebody parts not resembling a drivable truck.
 

codeman

Junior Member
Joined
Feb 22, 2024
Posts
2
Reaction score
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Location
WI
First Name
Cody
Truck Year
1990
Truck Model
GMC
Engine Size
5.7
do you know the mount locations on a 2012? How bad is the fab work, could I take the body mounts and put them on the 2012 frame ? Or is that something I’ll have to have fabricated
 

TheFishBox

Full Access Member
Joined
Jul 30, 2016
Posts
241
Reaction score
240
Location
OR
First Name
nick
Truck Year
1987
Truck Model
v30
Engine Size
6.0 ls
I would have to guess that would need to be fabricated. I suggest joining the squarebody duramax swap group on Facebook.
 

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