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Go Back   Fun In B.C. > All about your Ride > Chevy ramblings

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  #1  
Old 11-23-2009, 08:38 PM
Hotsauce Hotsauce is offline
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Frames

Can anyone tell me the difference between 73-80 4x4 frames and 81-87 4x4 frames. Also on that note whats the difference between 81-84 cabs vs 85-87? is there a site with all this info. I need to do a frame swap on my 81 1/2ton and i need to know what can be used for replacement.
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  #2  
Old 11-23-2009, 09:03 PM
rmiller026 rmiller026 is offline
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as far as i kno the frames are the same dunno bout the cabs
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  #3  
Old 11-23-2009, 09:49 PM
abec abec is offline
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cabs the same basically just the seat mounts and seat belts change ran into the same problem on my 80 short box i put a 77 cab on it
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Old 11-23-2009, 10:50 PM
tchevy tchevy is offline
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steering box mounts different. if your going from a half ton to 1 ton frame rails are 2 inches closer together at the back, spring perches will have to be cut and rewelded. some trucks have 56 inch rear springs, as opposed to the 52. im sure there is more
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Last edited by tchevy : 11-23-2009 at 10:55 PM.
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  #5  
Old 11-23-2009, 11:21 PM
m j m j is offline
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get the newest frame you can find
the crossmembers were updated, body mounts are different too

frame width did not change on the one tons, its the same as 1/2 ton
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Old 11-23-2009, 11:30 PM
Troy Troy is offline
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Quote:
Originally Posted by m j View Post
get the newest frame you can find
the crossmembers were updated, body mounts are different too

frame width did not change on the one tons, its the same as 1/2 ton
i may or may not be wrong but im pretty sure the back end of the frames were different widths for half and 1 tons
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Old 11-23-2009, 11:32 PM
Tsunami Tsunami is offline
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The front of the rails are different where the rad support sits and the way the front bumper mounts is also different
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Old 11-24-2009, 12:09 AM
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I have a 77 short box 4x4 frame in good shape if you need?
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  #9  
Old 11-24-2009, 12:18 AM
tchevy tchevy is offline
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Quote:
Originally Posted by m j View Post
\
frame width did not change on the one tons, its the same as 1/2 ton
Incorrect

1/2 ton and 3/4 ton frames are 42.5 and 1 ton is 40.5 inches, in the rear.
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Old 11-24-2009, 06:14 AM
m j m j is offline
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I used a c30 frame under my 77 shortbox
the box lined up perfectly
I used the 1/2-3/4ton hangers and the 14ff bolted right in
I certainly didnt change the width of the frame rails
http://www.chuckschevytruckpages.com/framespecs.html

IIRC the 40 and 42 are the spring perch distances, and the difference is in the hangers
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Last edited by m j : 11-24-2009 at 06:26 AM.
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  #11  
Old 11-24-2009, 12:06 PM
Troy Troy is offline
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thats what i was insinuating was that its either the frame or the hangers that makes up for the width difference
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  #12  
Old 11-24-2009, 06:35 PM
tchevy tchevy is offline
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hmm you might be right there, i will have to look closer at a 30 series
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  #13  
Old 11-24-2009, 07:20 PM
Hotsauce Hotsauce is offline
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So in a nut shell it's safe to say that i could use a 73-80 frame 1/2ton to 3/4 ton frame and mount my 81 body no problem aposed to custom fitting my rad support and front bumper? So using a 3" body lift and redrilling my bumper mounts will fix this too?
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  #14  
Old 11-24-2009, 09:37 PM
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yes. and the frames are the same width, even the cab'n'chassis, it's the hangers that are different.
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Old 11-24-2009, 09:39 PM
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Quote:
Originally Posted by Hotsauce View Post
So in a nut shell it's safe to say that i could use a 73-80 frame 1/2ton to 3/4 ton frame and mount my 81 body no problem aposed to custom fitting my rad support and front bumper? So using a 3" body lift and redrilling my bumper mounts will fix this too?
I put a '86 2wd cab onto a '80 4x4 frame, both 1/2 tons, auto. Body mounts were the same but had to use the '80 bumper, frames were different for bumper mounting. Had a TH350 and NP205 and 2wd cab had lots of clearance - no body lift to clear even though there was no hump in the 2wd cab. Just had to cut a hole for the transfer case shifter.
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