Tub and Frame mounting locations - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Twisted78SS · 03-01-2008, 08:26 AM

Hey guys,

Need a bit of help on this one. Does anyone know the true difference in mounting locations or heights between a 75 and 86 Blazer tub?

I have been searching the threads, but no luck..

I have a great opportunity to get a rust free tub (an 86') that will end up on my 75 4x4 frame..

Thanks,

Drew

Is this a correct assessment? I found this via google

There is an important difference between the 73-77 K5 body tubs and the 78-91 tubs. The corresponding difference can also be found in the frames. The 78-91 era has a footwell behind the front seats and a second set of outboard body mounts. The 77 and older have no footwell, and a pair of inboard mounts coming off a crossmember. The problem is the frame rises up about a foot further back on the newer trucks to accomodate the footwell.

A new body on an older frame means that footwell part will interfere with the frame, and either way you'll have to remake or retro fit the body mounts in that area. It may just take channeling that part of the floor so it drops down and clears the frame...

**Captkaos** · 03-01-2008, 11:47 PM

That is a correct statement. Save me some typing too!

Twisted78SS · 03-02-2008, 01:58 AM

Thanks,

I think I will just remove the parts I need and stick to the tub I have.

Jonboy · 03-02-2008, 04:22 AM

Yep. There are no rocker boxes in the 86 tub either. If you were going to cut the windshield pillar and swap to a full removable top, the body tends to flex at the doors. My 77 2wd was cut and had a little flex to it, especially with the top off. The picture I saw of the 75 made it look pretty decent. I think you would be a lot happier using that tub for parts, IMO.

Twisted78SS · 03-02-2008, 10:17 AM

Yeah, agreed. The more I researched it and then did another assessment on my ride, I will just use what parts I need and go from there.

I might even had left overs to get rid of...

03-01-2008, 08:26 AM	#1
Twisted78SS Wide n'Low Join Date: Jan 2007 Location: La Center, WA Posts: 1,511	Tub and Frame mounting locations Hey guys, Need a bit of help on this one. Does anyone know the true difference in mounting locations or heights between a 75 and 86 Blazer tub? I have been searching the threads, but no luck.. I have a great opportunity to get a rust free tub (an 86') that will end up on my 75 4x4 frame.. Thanks, Drew Is this a correct assessment? I found this via google There is an important difference between the 73-77 K5 body tubs and the 78-91 tubs. The corresponding difference can also be found in the frames. The 78-91 era has a footwell behind the front seats and a second set of outboard body mounts. The 77 and older have no footwell, and a pair of inboard mounts coming off a crossmember. The problem is the frame rises up about a foot further back on the newer trucks to accomodate the footwell. A new body on an older frame means that footwell part will interfere with the frame, and either way you'll have to remake or retro fit the body mounts in that area. It may just take channeling that part of the floor so it drops down and clears the frame... __________________ Trippin Hazard.. 67 swb, Gold Member.. 68 Suburban Air Force Retired Last edited by Twisted78SS; 03-01-2008 at 08:39 AM.

03-01-2008, 11:47 PM	#2
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Re: Tub and Frame mounting locations That is a correct statement. Save me some typing too! __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

03-02-2008, 01:58 AM	#3
Twisted78SS Wide n'Low Join Date: Jan 2007 Location: La Center, WA Posts: 1,511	Re: Tub and Frame mounting locations Thanks, I think I will just remove the parts I need and stick to the tub I have. __________________ Trippin Hazard.. 67 swb, Gold Member.. 68 Suburban Air Force Retired

03-02-2008, 04:22 AM	#4
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: Tub and Frame mounting locations Yep. There are no rocker boxes in the 86 tub either. If you were going to cut the windshield pillar and swap to a full removable top, the body tends to flex at the doors. My 77 2wd was cut and had a little flex to it, especially with the top off. The picture I saw of the 75 made it look pretty decent. I think you would be a lot happier using that tub for parts, IMO.

03-02-2008, 10:17 AM	#5
Twisted78SS Wide n'Low Join Date: Jan 2007 Location: La Center, WA Posts: 1,511	Re: Tub and Frame mounting locations Yeah, agreed. The more I researched it and then did another assessment on my ride, I will just use what parts I need and go from there. I might even had left overs to get rid of... __________________ Trippin Hazard.. 67 swb, Gold Member.. 68 Suburban Air Force Retired



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