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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

Supporting Member
Supporting Member
Joined
Mar 27, 2017
Posts
837
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705
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

Supporting Member
Supporting Member
Joined
Mar 27, 2017
Posts
837
Reaction score
705
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
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Aug 18, 2010
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9,878
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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.
 

wonderlander774

Junior Member
Joined
Dec 12, 2022
Posts
6
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Location
Ohio
First Name
Larry
Truck Year
1995 Chevrolet C/K 1500
Truck Model
1500
Engine Size
6.5L
Welcome
 

animal

Super Moderator
Staff member
Super Moderator
Joined
Jul 30, 2010
Posts
5,434
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3,562
Location
Georgia
First Name
Lee
Truck Year
1986
Truck Model
c10 silverado
Engine Size
350ish
:welcome:
 

Corvette Ed

Full Access Member
Joined
Nov 29, 2020
Posts
3,827
Reaction score
14,523
Location
East Tennessee
First Name
Eli
Truck Year
79
Truck Model
C10
Engine Size
250
Welcome aboard from East Tennessee.
 

Snoots

Full Access Member
Joined
Jan 23, 2013
Posts
8,192
Reaction score
16,055
Location
Georgia
First Name
Roger
Truck Year
1973
Truck Model
Jimmy Sierra
Engine Size
350
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