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Hotsauce
11-23-2009, 08:38 PM
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.

rmiller026
11-23-2009, 09:03 PM
as far as i kno the frames are the same dunno bout the cabs

abec
11-23-2009, 09:49 PM
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

tchevy
11-23-2009, 10:50 PM
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

m j
11-23-2009, 11:21 PM
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

Troy
11-23-2009, 11:30 PM
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

Tsunami
11-23-2009, 11:32 PM
The front of the rails are different where the rad support sits and the way the front bumper mounts is also different

MUD CHILD
11-24-2009, 12:09 AM
I have a 77 short box 4x4 frame in good shape if you need?

tchevy
11-24-2009, 12:18 AM
\
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.

m j
11-24-2009, 06:14 AM
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

Troy
11-24-2009, 12:06 PM
thats what i was insinuating was that its either the frame or the hangers that makes up for the width difference

tchevy
11-24-2009, 06:35 PM
hmm you might be right there, i will have to look closer at a 30 series

Hotsauce
11-24-2009, 07:20 PM
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?

FU Toolbag
11-24-2009, 09:37 PM
yes. and the frames are the same width, even the cab'n'chassis, it's the hangers that are different.

kootenaycat
11-24-2009, 09:39 PM
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.

m j
11-24-2009, 11:04 PM
the older frames are more prone to cracked crossmembers
get the newest one you can find as they updated the engine crossmember, r just wrecking yard shop for the newer crossmembers
hard to find one that isnt cracked under the fuelpump area

Hotsauce
12-20-2009, 07:37 PM
Not to keep shit kicking a dead horse here but.......... If my frame had a small diamond in the front between the front spring hanger and the front shackle would it be cheaper to go to a frame shop and get it pulled or swap frames? What is all involved in doing a frame swap and what kinda money am i talking? Also does anyone know what wheel and fram shops are charging an hour these days.

m j
12-20-2009, 07:53 PM
pulled