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#817367 - Wed Jan 18 2012 07:50 AM 77' crew cab to 66' GMC/Chevy swap  
Gunns  Offline
New Guy
Joined: Jan 2012
Posts: 4
CA
First off Ė What a fantastic web site!!

I currently have a '77 GMC 3/4ton Crew Cab that Iíve owned for the past twenty-five years. Iíve painted it outside twice and replaced the doors fenders and hood but time has finally caught up with it. It spent itís early years as a truck on a Texas Cattle Ranch and the winter salt has done it in.

I want to keep the 502 crate motor I put in it as well as the turbo trans. Both have very low mileage on them. The 502 is the high torque towing engine. Iíll also swap over the over load springs on the '77 to the '64-'66. I need another towing vehicle for my toybox trailer and Iím looking at the 1964-66 GMC/Chevy 3/4ton trucks. . I understand in 66 the 3/4ton GMCs went to leaf springs on the rear and Chevy stuck with the coils. I love the body style on these trucks and because of the year I wonít have to worry about the smog inspection here in the Peopleís Republic of California.

The toybox trailer (not a fifth wheel) is 21í and loaded weighs about 7-8,000 lbs. I plan on swapping the brakes front and rear to power disc. and installing power steering. One of the things I donít like on my '77 is the full floating rear axle which requires pulling the axles to do the drum brakes. I also didnít have much luck looking for a disc conversion for the '77 rear end.

My Questions are:

1. Will my 502 and turbo trans fit in the 64-66 trucks?
2. Is there a problem pulling that much weight with the older 3/4ton trucks?
3. What rear end (not ring and pinion) would you recommend for this application that would be an easy fit? Concerning gearing of the rear end my '77 has 3.73 gears and Iíd like something a little taller for lower RPMs at cruising speeds. Gearvendor over drives are a little pricy.
4. Would I have to stiffen up/reinforce the frame any. I understand that in 67 they went to thicker frame rails.
5. How about gas tanks? My '77 has saddle tanks with a total capacity of 40 gals. What gas tank options do I have for tanks that fit inside the frame rails that will give me a reasonable driving range?

Any assistance will be greatly appreciated! Iíd like to be doing the conversion by early summer. That way I can start now with accumulating the parts needed and of course a '64-'66 truck.

Thanks again!
Gunnar
So. California

Last edited by Gunns; Wed Jan 25 2012 10:17 PM.


#817486 - Wed Jan 18 2012 07:35 PM Re: 77' crew cab to 66' GMC/Chevy swap [Re: Gunns]  
jon1963  Offline
Shop Shark
Joined: Oct 2009
Posts: 596
fayetteville, nc
the engine and trans should fit fine. Have seen alot of big blocks and turbo trans in the trucks. The 3/4ton frame shouldn't have a problem pulling that kinda weight.


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#817515 - Wed Jan 18 2012 09:31 PM Re: 77' crew cab to 66' GMC/Chevy swap [Re: jon1963]  
LONGBOX55  Offline
Master Gabster
Joined: May 2006
Posts: 9,469
DANVILLE IL
If you're planning to do towing, you'll want to keep that 3.73 gear. Also, you'll want to keep the full floater, as it's much stronger that the semi floaters. For disk brakes, check out the '01-'07 GM 3/4 ton trucks, the smallblock powered 3/4 tons used the same 14 bolt rearend with disk brakes, should be an easy swap.


Bill Burmeister

#818293 - Sat Jan 21 2012 08:48 AM Re: 77' crew cab to 66' GMC/Chevy swap [Re: Gunns]  
wahl4m  Offline
Shop Shark
Joined: Mar 2000
Posts: 313
norwalk,iowa, usa
hi guy .im doing a 66 gmc/chevy crew cab to a 86 chevy crew cab single wheel ,frame ,and was told the 66 truck will not fit the 73 and newer chassis -due to the kick ups front and rear? my 66 crewie chassis was a piece of junk when stretched and some previous owners really screwed it up !i have seen in c the "classis trucks " magazine a green and white 65 crew cab truck that was mounted on a 78 ? chassis ! it was located in the tucson ariz. area ? if i could find the owner to verify what was used it would be great ! any way let us know if you get body to chassis w/ some pics ?thanks mike "carryallman" wahl norwalk iowa


#819686 - Wed Jan 25 2012 10:12 PM Re: 77' crew cab to 66' GMC/Chevy swap [Re: LONGBOX55]  
Gunns  Offline
New Guy
Joined: Jan 2012
Posts: 4
CA
Originally Posted By LONGBOX55
If you're planning to do towing, you'll want to keep that 3.73 gear. Also, you'll want to keep the full floater, as it's much stronger that the semi floaters. For disk brakes, check out the '01-'07 GM 3/4 ton trucks, the smallblock powered 3/4 tons used the same 14 bolt rearend with disk brakes, should be an easy swap.


Thanks for the info but I want to make sure I understand you correctly. Are you saying that the disc brake assembly on the rear ends of '01-'07 will fit onto my '77 full floater that I can then put under the'66. Or did you mean that it would be easy to take the whole rear end assembly off an '01 -'07 (brakes, rear axle etc.)and put it under the '66. I'm hoping you meant the former! But that would be too easy and no fun, right?

Thanks again for the info!


#819754 - Thu Jan 26 2012 02:04 AM Re: 77' crew cab to 66' GMC/Chevy swap [Re: Gunns]  
LONGBOX55  Offline
Master Gabster
Joined: May 2006
Posts: 9,469
DANVILLE IL
I did mean that the brake assemblies would be an easy swap to the older axle. The '01-'07 axle is wider, without knowing what type of bed you're running, that could be an issue. If you're running a flatbed, I don't see a problem with running the entire axle assembly, as width isn't as much of an issue.


Bill Burmeister

#819780 - Thu Jan 26 2012 02:58 AM Re: 77' crew cab to 66' GMC/Chevy swap [Re: LONGBOX55]  
chevy13man  Offline
Shop Shark
Joined: Apr 2006
Posts: 82
luling, TX
Howdy Gunns,

My '64 half ton coil spring truck regularly tows 10,000 pounds no problem. Fit an aftermarket tank under the bed behind the rear axle in addition to the behind the seat tank. Fitting the body to the frame is just a matter of building the mounts. Good luck and how 'bout some pics.


"The Marines I have seen around the world have the cleanest bodies, the filthiest minds, the highest morale, and the lowest morals of any group of animals I have ever seen. Thank God for the United States Marine Corps!"
Elanor Roosevelt

1966 c-10 stepside
1966 c-10 fleetside
1964 c-10 fleetside
1964 c-10 short bed
1964 c-30 flat bed
1964 c-60 dump truck
1968 Impala
1969 Nova
1971 Nova
1975 LUV
1976 C-30
1977 K-20
1966 SS El Camino

#819882 - Thu Jan 26 2012 02:41 PM Re: 77' crew cab to 66' GMC/Chevy swap [Re: chevy13man]  
johntsmith  Offline
Shop Shark
Joined: Sep 2010
Posts: 783
Tampa Bay FL
Longboxx55, do you know if the '01 to '07 brake assemblies will fit the original '66 3/4 ton?


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#819951 - Thu Jan 26 2012 06:16 PM Re: 77' crew cab to 66' GMC/Chevy swap [Re: wahl4m]  
padresag  Offline
Shop Shark
Joined: Mar 2009
Posts: 794
Sidney, B.C., Canada
Originally Posted By wahl4m
hi guy .im doing a 66 gmc/chevy crew cab to a 86 chevy crew cab single wheel ,frame ,and was told the 66 truck will not fit the 73 and newer chassis -due to the kick ups front and rear? my 66 crewie chassis was a piece of junk when stretched and some previous owners really screwed it up !i have seen in c the "classis trucks " magazine a green and white 65 crew cab truck that was mounted on a 78 ? chassis ! it was located in the tucson ariz. area ? if i could find the owner to verify what was used it would be great ! any way let us know if you get body to chassis w/ some pics ?thanks mike "carryallman" wahl norwalk iowa


here is an example of what the mounting looks like when someone puts a 64-66 on ab 84 4 x 4 frame. I bought it that way but just for the suburban body that was on it. it would never pass inspection here. and you have to alter frame length.
mind you would could build better mounting for the application, but gives you an idea of the difference.
I do believe that the suburban frames has a lesser rise in the 73-91 years than the pickups
http://www.chevytalk.org/fusionbb/showtopic.php?tid/275398/
ron

Last edited by padresag; Thu Jan 26 2012 09:04 PM.


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