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Old 05-27-2015, 05:23 PM   #1
bowfaber
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4BT Cummins 4L85 Long to Short

I'll give the dessert first! 1968, 4BT Cummins, 4L85e transmission, Long box cut down to a short box, used a short box frame. Rear air bags for hauling, AC, Hydro boost and 4 wheel disc brakes, quick ratio power steering, the list goes on. I have put 2,700 miles on it so far, no issues. Currently getting anywhere between 18-23 MPG. It's not afraid to work either...
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Last edited by bowfaber; 05-28-2015 at 08:10 AM.
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Old 05-27-2015, 05:29 PM   #2
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Re: 4BT Cummins 4L85 Long to Short

Long story short, I found an original short box patina truck in New Mexico. Part of the deal came with an original short box frame. Went down and drug them back to Iowa. Started the build and found this truck 7 miles from home. Bought it and used the short box frame from NM.
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Old 05-27-2015, 05:34 PM   #3
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Re: 4BT Cummins 4L85 Long to Short

frame work
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Old 05-27-2015, 05:37 PM   #4
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Re: 4BT Cummins 4L85 Long to Short

Why buy when you can build!? C notch, 1/4" plate, Universal bump stop from Speedway. Sand blast, primer, undercoat, and paint suspension parts
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Old 05-27-2015, 05:39 PM   #5
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Re: 4BT Cummins 4L85 Long to Short

Front end came out of a 71 GMC 1/2 ton giving me front disc brakes. McGaughys drop spindles up front, 4 inch CPP drop springs in the rear. New 3.08 Eaton Limited slip.
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Last edited by bowfaber; 05-27-2015 at 07:39 PM.
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Old 05-27-2015, 05:45 PM   #6
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Re: 4BT Cummins 4L85 Long to Short

Weld on disc brake kit from Speedway. First, the axle must be turned down to allow the rotor hat to slide over it. Next, the inner circle of the hat must have material removed to slide over the axle.
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Old 05-27-2015, 05:55 PM   #7
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Re: 4BT Cummins 4L85 Long to Short

Install the caliper, making sure there are lug nuts keeping pressure on the rotor, push it towards the "pumpkin" and put some tack welds on the bracket. I was able to get good welds on both sides of the caliper bracket, around axle tube and axle flange.
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Old 05-27-2015, 05:57 PM   #8
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Re: 4BT Cummins 4L85 Long to Short

Cab Bath.
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Old 05-27-2015, 06:10 PM   #9
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Re: 4BT Cummins 4L85 Long to Short

Smoothed out the firewall. Body work, primer, hosed it down with under coating (my favorite product so far has been Titeseal.) Dries fast, lays down nice, and it's paintable. Last, I got the factory green paint color and put a few coats on. You will find this undercoating every place I could get to- inside and out. I did whatever I could to keep the rust away and help with noise- because this engine makes a racket.
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Old 05-27-2015, 06:12 PM   #10
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Re: 4BT Cummins 4L85 Long to Short

cab corner
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Old 05-27-2015, 06:14 PM   #11
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Re: 4BT Cummins 4L85 Long to Short

cut out the old, make new pieces, seam sealer, primer, paint you know the drill...
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Old 05-27-2015, 06:17 PM   #12
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Re: 4BT Cummins 4L85 Long to Short

Wasn't very impressed with the fitment of this patch panel. I had to cut off about a 1/2 inch where the panel meets the rocker for it to be straight on the backside of the cab
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Old 05-27-2015, 06:19 PM   #13
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Re: 4BT Cummins 4L85 Long to Short

corner
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Old 05-27-2015, 06:20 PM   #14
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Re: 4BT Cummins 4L85 Long to Short

I will explain the process when I get to the bed chop.
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Old 05-27-2015, 06:20 PM   #15
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Re: 4BT Cummins 4L85 Long to Short

paint
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Old 05-27-2015, 06:23 PM   #16
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Re: 4BT Cummins 4L85 Long to Short

Cleaned the metal with purple power first, then spray on the PHIX
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Old 05-27-2015, 06:24 PM   #17
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Re: 4BT Cummins 4L85 Long to Short

undercoat
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Old 05-27-2015, 06:28 PM   #18
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Re: 4BT Cummins 4L85 Long to Short

Seam Sealer, Dynamat, Dynaliner
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Last edited by bowfaber; 05-28-2015 at 08:16 AM.
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Old 05-27-2015, 06:29 PM   #19
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Re: 4BT Cummins 4L85 Long to Short

con't
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Old 05-27-2015, 06:33 PM   #20
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Re: 4BT Cummins 4L85 Long to Short

Dynapad, under the hood- dynamat and dyna hoodliner
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Old 05-27-2015, 06:35 PM   #21
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Re: 4BT Cummins 4L85 Long to Short

Brace up the bed, measure it all out
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Old 05-27-2015, 06:39 PM   #22
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Re: 4BT Cummins 4L85 Long to Short

Make sure to cut on the correct side of the tape. I used a 4 1/2 in cut off wheel. Clamp it back together, making sure it is straight with a straight edge and glue it back together.
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Old 05-27-2015, 06:50 PM   #23
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Re: 4BT Cummins 4L85 Long to Short

This is where things got hairy for me. I started on the right side, could not for the life of me keep the panel straight after tacking where the old fuel fill door was. Tried and tried to weld on pieces of metal to pull out the low spots (don't have a dent puller) and use the hammer dolley for and extensive period of time with no luck. I went over to the Left side where I found a pile of bondo. I decided to cut it out and weld a different piece in from my trusty donor truck. In doing so I rid myself of the dreaded fuel door section. Got the panel in place and welded in with no issues in about 45 min. Since that went so well I cut out the abortion I had going on on the right side. Again, it took about 30 min- lifesaver! I'm not afraid to admit and show my failures, that's how we all learn. If you are cutting down a box I highly recommend doing one that does not have the fuel doors. Straight cuts and welds go much faster!
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Last edited by bowfaber; 05-31-2015 at 05:48 PM.
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Old 05-27-2015, 06:52 PM   #24
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Re: 4BT Cummins 4L85 Long to Short

The bumper came into contact with the bedside a few too many times. As you can see, the original piece had lost its body line. Cut it out and start over. I refuse to "fix" things with bondo.
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Last edited by bowfaber; 05-27-2015 at 11:19 PM.
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Old 05-27-2015, 06:55 PM   #25
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Re: 4BT Cummins 4L85 Long to Short

This is my redneck dent puller mentioned previously. Weld on pieces of scrap metal and use them as leverage to pull the dent out.
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