75 GMC sierra classic face lift and conversion to short bed
 

hi guys

i bought 75 long bed fleet side gmc sierra.
i got it as it is
6 cylinder(292ci) ,automatic gear and already face lifted to 81(i think)
the car is out of country and overseas.

my plane is converting to short bed step side and changing the engine to LS1

car has some body work ,need paint and need some new parts.
it doesn't have rust,just little bit in driver floor pan ,but the serious problem is;somebody stole the complete engine wiring after socket,the car had 12 circuit engine wiring and i could not find it yet. i need the color engine wiring diagram.
the other problem is preparing the parts,as i told the car in not in U.S
but i have to do it.
need your technical help for cutting the chassis and all work depend on that.

here is some pictures:

Re: 75 GMC sierra classic face lift and conversion to short bed
 

the other pics:

Re: 75 GMC sierra classic face lift and conversion to short bed
 

Good starting point. Where overseas is it? And forgive me for asking, but why not just find one closer to home?

There are several ways to go about cutting the frame, 1st measure 6" off the rear cab mounts, you'll be removing 14" of material, I like an interlocking fit, so I measure 20" with 3" top and bottom interlocks, think the z shaped pieces in tetris. Brace it with angle iron and clamps. Measure a bunch of times to make sure its square and tack it together. Set the bed on to make sure your wheels are centered, pull it back off and finish weld. Then fish plate. You'll also be removing about 6" off the end of the frame.

Others may have different ways of doing this, but I've done it this way on three of my friends trucks and came out golden.
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Re: 75 GMC sierra classic face lift and conversion to short bed
 

I don't have a scanner, and this isn't to scale, but hopefully this helps.

http://i640.photobucket.com/albums/u...-36-32_351.jpg
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Re: 75 GMC sierra classic face lift and conversion to short bed
 

thanks for your respond slammed427 ,well the car is in Iran,was imported in 75 by the american pilot,car kept in good condition. that's why im telling i have problem with preparing the parts,cause of sanction.
i saw different cutting way with others, and i didn't see the way you described ,but i think its the best.your measure was helpful. but one thing ;which tools i need to cut the frame ,any kind of saw?what about joining,do i need TIG?or something else?

already i bought a step side bed(long one).
and right know i don't know how to cut the bed? i think i need change the steps, but im pretty sure i cant find it in Iran.

oh i forgot i bought and engine wiring but 14 circuit,i don't know is it compatible with my car or not.

here are the bed pics:

Re: 75 GMC sierra classic face lift and conversion to short bed
 

A plasma cutter would be the easiest way to cut it. I've done it with a torch once, and a sawzall the other times. As far as welding it, a 220 Mig will do the job just fine. Shortening the bed prolly won't be too bad with the stepside, but I've never done it. I'm pretty sure the numbers would be the same, but don't quite me on that.

As far as the steps go, try and narrow them. Its only metal.

And the 14 curcuit will be fine, as long as its for the 73-87 trucks. Anything you don't need just tuck out of the way.
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Re: 75 GMC sierra classic face lift and conversion to short bed
 

finally project has been started
already removed the painting and ready to go to body work
bought new hood ,im gonna change it .

Re: 75 GMC sierra classic face lift and conversion to short bed
 

removed bed from chassis and will go to cut the chassis.
anybody know exactly from where we have to chop the chassis ?
and also is there any dimension for cutting the side panels in step side bed?i mean how long we have to cut and from where?

Re: 75 GMC sierra classic face lift and conversion to short bed
 

can anybody show me on this pics,from where exactly i have to cut the chassis?

Re: 75 GMC sierra classic face lift and conversion to short bed
 

Measure six inches off the back of the cab, and start laying out your cuts based on the diagram I posted above.

The stepside will be easier to cut down than a fleetside. Try setting your bed on before you cut the frame, remove the steps, then measure 14" beteeen the front of the flare and the front stake pocket. This will give you an idea of where to start after the frame is finished.

Take your time, measure twice and cut once.
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Re: 75 GMC sierra classic face lift and conversion to short bed
 

im looking for ZR1 roll pan ,i did not find .does anybody know ,where can i find it?

Re: 75 GMC sierra classic face lift and conversion to short bed
 

COOL build. This is where I was looking for a roll pan

http://www.superiorcustoms.com/rollpanmain.htm

Re: 75 GMC sierra classic face lift and conversion to short bed
 

thanks chet
i know this site,but unfortunately they are not providing this kind of roll pan for 1973-1987 anymore and discontinued.

Re: 75 GMC sierra classic face lift and conversion to short bed
 

already shopped the chassis
unfortunately i couldn't find sawzall,and used that way to cut

Re: 75 GMC sierra classic face lift and conversion to short bed
 

we had welding,but its not a final .
we did level on bout side of chassis,and weld some point on that ,to fixing for CO2 weld.

Re: 75 GMC sierra classic face lift and conversion to short bed
 

pushing the frame sections back together. Got it all welded up

Re: 75 GMC sierra classic face lift and conversion to short bed
 

bending the iron sheet to making the fish plate

Re: 75 GMC sierra classic face lift and conversion to short bed
 

start the shortening of drive shaft
the original one had some ding on it,and we couldn't to balance,that's why bought a better one but second hand,and just used the original yoke .

Re: 75 GMC sierra classic face lift and conversion to short bed
 

final welding and final balancing

Re: 75 GMC sierra classic face lift and conversion to short bed
 

You got some very serious tools and equipment over there in Iran!
I love it there, hangin with the homies, drinkin a 40.
Iran is the ****! Say hey to the iatola for me!

Re: 75 GMC sierra classic face lift and conversion to short bed
 

dude im not that kind of political guy
and i dont care what the iatola doing in iran
just im gonna do my job

thanks god we have lots of equipment to re build and restore the muscle cars

just look at these websites ,we have lots of muscle cars
maybe you dont know how to read persian, but you can look at the pictures

http://www.tt.tuningtalk.com/forum/v...27&start=20370

http://tt.tuningtalk.com/forum/viewt...6412&start=780

http://www.aparat.com/v/lf1vh

http://tt.tuningtalk.com/forum/viewt...497&start=1360

http://tt.tuningtalk.com/forum/viewt...6412&start=750

http://www.mustang-v8.blogfa.com/

Re: 75 GMC sierra classic face lift and conversion to short bed
 

we did not find the short bed fuel tank,and we wanted to shorteting the tank,we did it ,but there is huge rust inside.
we talked to the person who doing sandblast and told: it doesn't make sense, and this is a unusable tank ,finally we got a blazer fuel tank and fixed it in to the chassis
well not bad

Re: 75 GMC sierra classic face lift and conversion to short bed
 

nice build bro and nice job shortening the frame keep up the good work....

Re: 75 GMC sierra classic face lift and conversion to short bed
 

Good job on the frame. Did you turn bolt heads to make them look like rivets?

Re: 75 GMC sierra classic face lift and conversion to short bed
 

thanks luifer76 and LEEVON


yes ,i did it and its looking good



there is someting I did a search and didn't find what I was looking for.

I am going to put the '82 body on the '75 frame.

Can someone tell me specifically what the differences are between the body mounts, and which ones I should use for my project. 82 or 75?