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njc1980sqbdygmc15

Junior Member
Joined
Dec 4, 2022
Posts
1
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Location
east berlin, ct
First Name
Nick
Truck Year
1980
Truck Model
c15
Engine Size
5.3
Name is Nick and I am building a 1980 GMC C15 2WD LB (will be converting to a SB) originally equipped with a diesel engine and will be powered by a 5.3 lm7. The truck is completey torn down and only have cab sitting on rolling frame. I finished up the body work of cab and the frame cab mounts, the front frame cab mounts were in much worse shape than rear. The modifications that i did to frame mounts now will not allow one of the front body cab mounts to line up and am off about 1.5 inch.
I am looking for the following:

1. I need to know if there are some diagonal dimensions from fender cowl mount holes to radiator support holes that i could use as a baseline to square cab up so i could hog out holes in the front frame cab mounts.
2. Dimensions from outer rocker panel to center of cab mounts on all four corners.

Any other help woul be greatly appreciated.
 

Tank6x2

You’re Awesome Know That!
Lifetime Supporting Member
Joined
Mar 27, 2017
Posts
1,259
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Location
Edmonton Alberta Canada
First Name
Kurt
Truck Year
79/86
Truck Model
C30
Engine Size
350, TH400.4:10 gears 2WD
Hey Nick! Kurt from way above the 49th parallel! :welcome:
 

Tank6x2

You’re Awesome Know That!
Lifetime Supporting Member
Joined
Mar 27, 2017
Posts
1,259
Reaction score
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Location
Edmonton Alberta Canada
First Name
Kurt
Truck Year
79/86
Truck Model
C30
Engine Size
350, TH400.4:10 gears 2WD
Name is Nick and I am building a 1980 GMC C15 2WD LB (will be converting to a SB) originally equipped with a diesel engine and will be powered by a 5.3 lm7. The truck is completey torn down and only have cab sitting on rolling frame. I finished up the body work of cab and the frame cab mounts, the front frame cab mounts were in much worse shape than rear. The modifications that i did to frame mounts now will not allow one of the front body cab mounts to line up and am off about 1.5 inch.
I am looking for the following:

1. I need to know if there are some diagonal dimensions from fender cowl mount holes to radiator support holes that i could use as a baseline to square cab up so i could hog out holes in the front frame cab mounts.
2. Dimensions from outer rocker panel to center of cab mounts on all four corners.

Any other help woul be greatly appreciated.
Any chance you’ve attempted loosening the other bolts off before installing them by hand or possibly double checking the mounting hardware/mounts for proper configuration?
 

Mr Clean

Super Moderator
Staff member
Marine Corps Moderator
Joined
Aug 18, 2010
Posts
11,312
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13,883
Location
North East Texas
First Name
Shawn
Truck Year
1982 & 1985
Truck Model
K10 Extra Cab w/ Proper SWB, & 85 K5 Blazer
Engine Size
454 BBC, & 383 Stroker
:welcome:
The way I have always set my cabs, is measure from the fender mounting tab on the cab (the one on the bottom part of the cab) and go across to the front opposite side frame horn.
 

animal

Super Moderator
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Joined
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Posts
5,944
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4,476
Location
Georgia
First Name
Lee
Truck Year
1986
Truck Model
c10 silverado
Engine Size
350ish
:welcome:
 

Snoots

Full Access Member
Joined
Jan 23, 2013
Posts
10,597
Reaction score
25,218
Location
Georgia
First Name
Roger
Truck Year
1973
Truck Model
Jimmy Sierra
Engine Size
350 w/203
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