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01-26-2014, 07:36 PM
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#1 |
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Registered User
Join Date: Jun 2013
Location: Hubbard OR
Posts: 67
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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]
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01-27-2014, 02:59 PM
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#2 |
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Registered User
 
Join Date: Feb 2009
Location: Surprise, AZ
Posts: 490
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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.
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-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 |
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01-27-2014, 03:38 PM
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#3 |
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6>8 Plugless........
 
Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,139
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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.
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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 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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01-27-2014, 03:45 PM
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#4 |
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Registered User
Join Date: Jan 2010
Location: Loveland, CO
Posts: 1,921
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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.
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Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 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 |
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01-27-2014, 04:50 PM
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#5 |
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Registered User
Join Date: Jun 2013
Location: Hubbard OR
Posts: 67
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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.
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01-27-2014, 10:17 PM
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#6 |
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Registered User
Join Date: Feb 2009
Location: Surprise, AZ
Posts: 490
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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. 
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-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 |
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01-27-2014, 10:37 PM
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#7 |
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Registered User
Join Date: Jan 2010
Location: Loveland, CO
Posts: 1,921
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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.
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Zach 1970 Chevrolet Custom Camper K20 1971 GMC Super K2500, 12V/NV4500 swap in progress 1971 Chevrolet Custom C10 1972 Chevrolet Custom Deluxe C20, 5.3/4L60E 1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi 2004 GMC Sierra 2500HD, LB7/Allison, CCSB 2005 GMC Sierra 1500, 5.3/4L60E, CCSB |
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01-31-2014, 11:47 AM
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#8 |
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Registered User
Join Date: Jun 2013
Location: Hubbard OR
Posts: 67
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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.
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01-31-2014, 08:58 PM
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#9 |
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Senior Member
Join Date: Apr 2004
Location: sw colorado
Posts: 2,720
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Re: 72 Cummins swap
Pipes look pretty darn clean to me.
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01-31-2014, 09:57 PM
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#10 |
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6>8 Plugless........
Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,139
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Re: 72 Cummins swap
Looks really nice!
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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 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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02-01-2014, 04:39 PM
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#11 |
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Vintage 4x4s
Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
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Re: 72 Cummins swap
subscribed!
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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 |
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04-10-2014, 04:05 PM
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#12 |
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Registered User
Join Date: Jun 2013
Location: Hubbard OR
Posts: 67
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Re: 72 Cummins swap
Got my cab back from the blaster the other day.
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. |
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04-10-2014, 08:59 PM
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#13 |
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6>8 Plugless........
Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,139
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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.
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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 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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04-11-2014, 04:19 PM
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#14 |
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Registered User
Join Date: Jun 2013
Location: Hubbard OR
Posts: 67
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Re: 72 Cummins swap
Took so more pictures with the cab off.
I cut the top two rows out of my IC to make it fit. |
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04-23-2014, 01:41 PM
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#15 |
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Registered User
Join Date: Jun 2009
Location: ALASKA
Posts: 48
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Re: 72 Cummins swap
Nice job! Any idea on what you'll end up having invested in just the Cummins swap?
Subscribed!
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1991 Chevy K10, 4x4 ______ Past Rides 1971 Chevy C20 Longhorn (6.6L, 402c.i.); 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). |
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04-24-2014, 03:47 PM
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#16 |
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Registered User
Join Date: Jun 2013
Location: Hubbard OR
Posts: 67
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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.
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04-25-2014, 07:52 PM
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#17 |
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6>8 Plugless........
Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,139
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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 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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05-01-2014, 07:45 PM
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#18 |
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Registered User
Join Date: Jul 2012
Location: Mount Victory, Ohio
Posts: 101
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Re: 72 Cummins swap
Great project! Keep up the good work!
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08-05-2014, 04:58 PM
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#19 |
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Registered User
Join Date: Dec 2004
Location: jackson,ca
Posts: 488
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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
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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 |
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08-05-2014, 06:22 PM
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#20 |
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Registered User
Join Date: Jun 2013
Location: Hubbard OR
Posts: 67
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Re: 72 Cummins swap
Both shifters came out different. Just a weld and cut job for the new openings.
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08-30-2014, 10:01 PM
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#21 |
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Registered User
Join Date: Apr 2013
Location: Western Montana
Posts: 50
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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? 
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09-02-2014, 10:41 AM
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#22 |
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Registered User
Join Date: Jun 2013
Location: Hubbard OR
Posts: 67
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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.
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09-02-2014, 01:32 PM
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#23 |
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Registered User
Join Date: Apr 2014
Location: NOR-CAL
Posts: 1,134
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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
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09-02-2014, 04:17 PM
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#24 |
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Registered User
Join Date: Jun 2013
Location: Hubbard OR
Posts: 67
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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.
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09-02-2014, 05:48 PM
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#25 |
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Registered User
Join Date: Apr 2014
Location: NOR-CAL
Posts: 1,134
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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 |
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