The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain > Diesel Conversions

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 01-26-2014, 07:36 PM   #1
Dewey72
Registered User
 
Join Date: Jun 2013
Location: Hubbard OR
Posts: 45
72 Cummins swap

Trying to figure out what to do for a fuel tank. I would like to swap out the front seat to newer one and move the seat rearward. I'm going to run 4" exhaust over the rear axle so a near mount tank is kind off difficult without making a custom tank. Plus I think I will run nerf bars but not sure if the saddle tanks will clear. What have other guys done? Looking for advice.[ATTACH]Name:  chevy 002.jpg
Views: 8042
Size:  48.8 KB

Name:  chevy 003.jpg
Views: 3638
Size:  53.2 KB[/ATTACH]
Dewey72 is offline   Reply With Quote
Old 01-27-2014, 02:59 PM   #2
gerfunken
Registered User
 
gerfunken's Avatar
 
Join Date: Feb 2009
Location: Surprise, AZ
Posts: 490
Re: 72 Cummins swap

So, I actually went with a 31-gal fuel tank from a square body suburban. It fits cleanly between the rails. I had to remove the back two cross members, turning one around to provide the front mounting bracket. As far as exhaust goes, it looked like I had more of an issue from the rear brake line bracket than from the exhaust. I've got a little bit of room, but not an extreme amount, and will be looking at the exhaust routing next.

The mounting of the tank is one the last couple of pages, but I can always take more pictures if you need.
__________________
-Scott

1972 Chevy K20
Picture Gallery
Build Thread

1930 Chevy AD
Picture Gallery

1929 Ford Model-A
Picture Gallery

1975 Triumph TR-6
Picture Gallery
gerfunken is offline   Reply With Quote
Old 01-27-2014, 03:38 PM   #3
Dieselwrencher
6>8 Plugless........

 
Dieselwrencher's Avatar
 
Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 15,355
Re: 72 Cummins swap

I have some pictures in my build thread when I stuck a 40 gal burb tank from a square body in my Longhorn. I had to move all the same things Scott did as well. I ended up ditching that when I went to air ride though. Now I have to build a tank for it. By the way, nice swap you have going.
__________________
Ryan
1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread
1976 K30 CC SWB Build Thread

Tired of spark plugs? Check this out.
Dieselwrencher is offline   Reply With Quote
Old 01-27-2014, 03:45 PM   #4
BigRed76
Senior Member
 
BigRed76's Avatar
 
Join Date: Jan 2010
Location: Loveland, CO
Posts: 1,920
Re: 72 Cummins swap

Is your truck 4x4? If it is and is lifted at all then I'd think you could run a rear mount tank and still have room for 4" exhaust. I installed a 25 gal. square body burb tank in my '71, and after moving those rear crossmembers it fits like a glove...but I had absolutely no room for exhaust back there since mine's 2wd and lowered 5.5" in the rear.

I picked the 25 gal. tank because it only hangs down a few inches below the frame rails, whereas the 31 gal. & 40 gal. tanks hang lower.
__________________
Zach

1971 Chevrolet Custom C10, 5.3/4L60E, 3.73's
1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi
1996 Chevrolet Cheyenne K1500, 5.0L/4L60E, ECSB
2004 GMC Sierra 2500HD, LB7/Allison, CCSB
2005 GMC Sierra 1500, 5.3/4L60E, CCSB


Last edited by BigRed76; 01-27-2014 at 03:45 PM. Reason: word choice
BigRed76 is offline   Reply With Quote
Old 01-27-2014, 04:50 PM   #5
Dewey72
Registered User
 
Join Date: Jun 2013
Location: Hubbard OR
Posts: 45
Re: 72 Cummins swap

Forgot to give ya the specs. 72 short wide 93 12 valve, nv4500, 205, 60 front and 70 rear 4" lift . Not sure if the rear tank will clear the 4" being a SW box. I'll post more, newer pics later. Everyone likes pictures.
Dewey72 is offline   Reply With Quote
Old 01-27-2014, 10:17 PM   #6
gerfunken
Registered User
 
gerfunken's Avatar
 
Join Date: Feb 2009
Location: Surprise, AZ
Posts: 490
Re: 72 Cummins swap

From my thread...


I've done some cursory measurements, and also checked online. There are three sized tanks that the Suburbans came with:
25 Gallon: 28-3/4" x 28-18" x 10-3/4"
31 Gallon: 28-3/4" x 28-18" x 12-3/4"
40 Gallon: 35" x 28-3/4" x 13-1/8"
(Sizes verified on LMC Truck, O'Reilly & Napa Auto websites)


I decided to go with the square-body suburban 31 gallon gas tank. That required a little bit of fabrication on the back end of the truck.

To start, the rear cross-sill (the one with the light plug) came out, and was rotated 180-degrees, and became the front brace for the fuel tank.




This effort was followed for quite some time with lots of measurements. I needed to have the fuel neck clear the frame, but at the same time not be so tall as it would bump into the bottom of the bed. Likewise, I needed to play with it front-to-back as so to sit between the bed rails. Once that was done, I finished the calculations and made the brackets.







Then it was a matter of getting it into its final resting place.


***Note: The rear brake line is a temporary solution, and will be getting adjusted either today or next weekend. I'll re-work the bracket and provide more substantive support across the frame before joining to the soft-line on the axle.

__________________
-Scott

1972 Chevy K20
Picture Gallery
Build Thread

1930 Chevy AD
Picture Gallery

1929 Ford Model-A
Picture Gallery

1975 Triumph TR-6
Picture Gallery
gerfunken is offline   Reply With Quote
Old 01-27-2014, 10:37 PM   #7
BigRed76
Senior Member
 
BigRed76's Avatar
 
Join Date: Jan 2010
Location: Loveland, CO
Posts: 1,920
Re: 72 Cummins swap

In that case I'm not sure that any of those tanks would fit in a short bed. Might be more logical to run a 67-72 suburban tank.
__________________
Zach

1971 Chevrolet Custom C10, 5.3/4L60E, 3.73's
1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi
1996 Chevrolet Cheyenne K1500, 5.0L/4L60E, ECSB
2004 GMC Sierra 2500HD, LB7/Allison, CCSB
2005 GMC Sierra 1500, 5.3/4L60E, CCSB

BigRed76 is offline   Reply With Quote
Old 01-31-2014, 11:47 AM   #8
Dewey72
Registered User
 
Join Date: Jun 2013
Location: Hubbard OR
Posts: 45
Re: 72 Cummins swap

Got my IC pipes done but not sold on the color. Might powder coat later. Anyway I think they turned out OK.
Name:  72 chevy 001.jpg
Views: 3566
Size:  62.8 KB
Name:  72 chevy 007.jpg
Views: 3190
Size:  38.6 KB
Name:  72 chevy 005.jpg
Views: 3274
Size:  47.5 KB
Dewey72 is offline   Reply With Quote
Old 01-31-2014, 08:58 PM   #9
ryanroo
Senior Member
 
ryanroo's Avatar
 
Join Date: Apr 2004
Location: sw colorado
Posts: 2,722
Re: 72 Cummins swap

Pipes look pretty darn clean to me.
__________________
72 K20 12v build
72 K20 "parts truck"

ryanroo is offline   Reply With Quote
Old 01-31-2014, 09:57 PM   #10
Dieselwrencher
6>8 Plugless........

 
Dieselwrencher's Avatar
 
Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 15,355
Re: 72 Cummins swap

Looks really nice!
__________________
Ryan
1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread
1976 K30 CC SWB Build Thread

Tired of spark plugs? Check this out.
Dieselwrencher is offline   Reply With Quote
Old 02-01-2014, 04:39 PM   #11
Vintage Windmills
Vintage 4x4s
 
Vintage Windmills's Avatar
 
Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
Re: 72 Cummins swap

subscribed!
__________________

67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades)
67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore )
86 CHV K30 502 th400, apple red NEW
71 CHV K20 350 SM465, ochre (saved work truck)
71 CHV K20 292 SM465, white, tach, PTO, (future project)
72 CHV K20 350 350th, medium blue (project stocker)
01 CHV K2500hd crew, indigo blue

^3 dont run and the others don't see winter either
'86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649
'71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642
'72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6
Vintage Windmills is offline   Reply With Quote
Old 04-10-2014, 04:05 PM   #12
Dewey72
Registered User
 
Join Date: Jun 2013
Location: Hubbard OR
Posts: 45
Re: 72 Cummins swap

Got my cab back from the blaster the other day.
Name:  cab 015.jpg
Views: 3600
Size:  56.5 KB
Name:  cab 016.jpg
Views: 3154
Size:  64.7 KB
That blasting sure finds the rust. I knew I needed floor board and rockers but found some rust under the windshield. Looks like I need to find a donor cab to cut part of the windshield frame out and weld into mine. In less somebody has a better idea.
Name:  cab 020.jpg
Views: 3015
Size:  25.0 KB
Dewey72 is offline   Reply With Quote
Old 04-10-2014, 08:59 PM   #13
Dieselwrencher
6>8 Plugless........

 
Dieselwrencher's Avatar
 
Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 15,355
Re: 72 Cummins swap

Yeah, sand blasting will sure find any soft spots in the metal. If you look in the 67-72 parts section on here, you might find a cab someone is cutting for patches and you might be able to get one that way.
__________________
Ryan
1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread
1976 K30 CC SWB Build Thread

Tired of spark plugs? Check this out.
Dieselwrencher is offline   Reply With Quote
Old 04-11-2014, 04:19 PM   #14
Dewey72
Registered User
 
Join Date: Jun 2013
Location: Hubbard OR
Posts: 45
Re: 72 Cummins swap

Took so more pictures with the cab off.
Name:  cab off 002.jpg
Views: 3072
Size:  62.8 KB
Name:  cab off 003.jpg
Views: 3045
Size:  54.3 KB
I cut the top two rows out of my IC to make it fit.
Name:  cab off 001.jpg
Views: 3061
Size:  56.9 KB
Dewey72 is offline   Reply With Quote
Old 04-23-2014, 01:41 PM   #15
ahsom79vette
Registered User
 
ahsom79vette's Avatar
 
Join Date: Jun 2009
Location: Sierra Nevada Mounatins, California
Posts: 48
Re: 72 Cummins swap

Nice job! Any idea on what you'll end up having invested in just the Cummins swap?

Subscribed!
__________________
1971 Chevy C20 Longhorn (6.6L, 402c.i.);
2006 Chevy Cobalt (2.2L).
______
Past Rides
1973 Chevy K20, 4x4, std. cab, longbed (5.7L);
1979 Chevy Corvette (5.7L);
2001 Chevy Xtreme S-10, ex-cab, 5spd. (4.3L);
2001 Chevy Silverado 2500HD, 4x4, ex-cab, (6.0L);
2002 Chevy Silverado 1500, ex-cab, 4-6drop (4.8L);
2003 Chevy Silverado 1500, 4x4, std. cab, 5spd. (4.8L);
2004 Chevy Colorado Z71, 4x4, crew cab, (3.5L);
2006 HUMMER H3, 4x4, 5spd., (3.5L).

The other day I looked to see how may posts I've had... "WHAT!!! It should be at least in the hundreds!"
Then I realized- I post about as much as I talk.
ahsom79vette is offline   Reply With Quote
Old 04-24-2014, 03:47 PM   #16
Dewey72
Registered User
 
Join Date: Jun 2013
Location: Hubbard OR
Posts: 45
Re: 72 Cummins swap

Not sure on the investment. I am keeping all receipts from everything but scared to add it all up. Maybe some day.
Dewey72 is offline   Reply With Quote
Old 04-25-2014, 07:52 PM   #17
Dieselwrencher
6>8 Plugless........

 
Dieselwrencher's Avatar
 
Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 15,355
Re: 72 Cummins swap

Don't add it up until you can drive it. Just speaking from experience. It might make ya cry.
__________________
Ryan
1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread
1976 K30 CC SWB Build Thread

Tired of spark plugs? Check this out.
Dieselwrencher is offline   Reply With Quote
Old 05-01-2014, 07:45 PM   #18
superduty_59
Registered User
 
Join Date: Jul 2012
Location: Mount Victory, Ohio
Posts: 101
Re: 72 Cummins swap

Great project! Keep up the good work!
superduty_59 is offline   Reply With Quote
Old 08-05-2014, 04:58 PM   #19
rgreathouse
Registered User
 
Join Date: Dec 2004
Location: jackson,ca
Posts: 453
Re: 72 Cummins swap

Keep it up, looks great! With your transfer case linkage did you have to cut the floor at all? Or did it stay inside the opening? I have an nv4500 and 29
Spline np205 and with the advanced adapters bracket it sticks the tcase shifter pretty far away from the transmission shifter
__________________
1972 c10,2wd,long bed,250,4spd---->
1972 SWB Fleetside 4x4 12v Cummins build thread
http://67-72chevytrucks.com/vboard/s...d.php?t=513791
rgreathouse is offline   Reply With Quote
Old 08-05-2014, 06:22 PM   #20
Dewey72
Registered User
 
Join Date: Jun 2013
Location: Hubbard OR
Posts: 45
Re: 72 Cummins swap

Both shifters came out different. Just a weld and cut job for the new openings.
Name:  cab off 004.jpg
Views: 2716
Size:  56.4 KB

Name:  cab off 034.jpg
Views: 2711
Size:  61.6 KB
Dewey72 is offline   Reply With Quote
Old 08-30-2014, 10:01 PM   #21
shopteacher
Registered User
 
Join Date: Apr 2013
Location: Western Montana
Posts: 50
Re: 72 Cummins swap

great project and I'm Subscribed to this one! could you show a couple of pictures of you engine mounts please!

What color are you going with?
shopteacher is offline   Reply With Quote
Old 09-02-2014, 10:41 AM   #22
Dewey72
Registered User
 
Join Date: Jun 2013
Location: Hubbard OR
Posts: 45
Re: 72 Cummins swap

I used a engine mount from autoworld. I'll see if I can get some pic's for ya. I think I'll keep the color the same. The truck was my Dad's bought new in 72.
Dewey72 is offline   Reply With Quote
Old 09-02-2014, 01:32 PM   #23
Nitis
Registered User
 
Nitis's Avatar
 
Join Date: Apr 2014
Location: NOR-CAL
Posts: 1,127
Re: 72 Cummins swap

Back to your original post. I don't blame you for removing the tank from the cab but you won't gain any more room to move the seat back. All the seats always hit the cab above the tank before they hit the tank. Unless you want a seat that sits at a 90 degree upright there's nothing to gain
Nitis is offline   Reply With Quote
Old 09-02-2014, 04:17 PM   #24
Dewey72
Registered User
 
Join Date: Jun 2013
Location: Hubbard OR
Posts: 45
Re: 72 Cummins swap

Not sure if I'm going to use the factory tank or not for sure yet. But was thinking more of room for some speaker boxes. Try to hear over the diesel noise. Speaking of that is anyone running a flowmaster diesel muffer and what does it sound like. Got a 4 inch on mine and sounds cool but not sure under load what it sounds like.
Dewey72 is offline   Reply With Quote
Old 09-02-2014, 05:48 PM   #25
Nitis
Registered User
 
Nitis's Avatar
 
Join Date: Apr 2014
Location: NOR-CAL
Posts: 1,127
Re: 72 Cummins swap

Ok just didn't want you getting your hopes up! But yes that space is definitely useable for something.

Also you said your using a cummins from a 93?

From my limited time in the diesel world but aside from the looks of a 4" I don't think you will gain anything performance wise from it. I thought that only mastered once you get up over 500-600 horse power or something. Just a thought maybe you can split it or something?

Again I'm no diesel mechanic just throwing it out there
Nitis is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 10:21 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com