2nd gen 12v drag race build - Dodge Cummins Diesel Forum
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post #1 of 32 (permalink) Old 04-12-2019, 03:22 PM Thread Starter
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2nd gen 12v drag race build

So technically this is POWERED by a 1994 12v. It is not a 2nd gen dodge. But, I've had a lot of people ask for a full build thread, so here it is. If moderators need to move this thread, go ahead and then just let me know.

Goals are: 700 whp and 1300ft/lb torque. No more than 8000lb curb weight. I want a fast, fun, comfortable street truck. I truck that is comfortable and reliable enough to drive cross country, be able to tow anything, and hit the drag strip at will. I drive like a moron, so I want to be able to race all day long and be able to drive hours to get home. I live in the boonies and the closest drag strip is hours away.

mid 2000's Kenworth day cab (T800)
94' p-pump 12v (I have 2 engines to choose from)
11.5" aam rear axle
Duramax front suspension
10 lug wheel adapters
22.5 fronts
22.5 super single rears (445 width!)
full custom 4 link rear suspension w/forged 4140 ballistic joints and doubled up pro-mod front adjustable mounts
2.0 OD x 0.250" wall thickness 4130 chromoly 4 link bars
airbags at all 4 corners
Fox 2.5 shocks w/ piggyback bypass shocks on rear (I know these are overkill on a street truck, but they were cheap)
47rh trans
PIAA LED lighting front and rear

Still to do:

Comfy seats mounted to custom made sprung seat bases
Crow harnesses
custom roll bar/4 point cage
Full autometer ultra-light gauge set-up
5 inch 304 stainless custom exhaust, run with a diverter valve for muffled stack exhaust or straight pipe
exhaust brake (I'm of the opinion truck brakes suck, and an exhaust brake hopefully will significantly improve braking power)
compound turbo setup, custom made (I'll need advise for which turbos to use)
need to build fuel system (I'll need advise on what parts to choose)
need to build trans
Speaking with QA1 about a carbon drive shaft
tires (damn super singles are expensive!)
semi truck 5th wheel plate (I like the look)
LOTS of welding
custom carbon fiber hood
custom carbon fiber cab floor (need to mount the trans first to be able to calculate the tunnel dimensions)
custom carbon fiber firewall (same restraints as the floor)\
paint scheme (?)

I'm not saying I can build an award winning truck but I am not sparing any expenses. I do not want to look back and think to myself that I should have used a better anything. I perform all my own engineering and fabrication.

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post #2 of 32 (permalink) Old 04-12-2019, 03:23 PM Thread Starter
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Started with a cab and lotsosteel
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post #3 of 32 (permalink) Old 04-12-2019, 03:24 PM Thread Starter
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beginning phases still
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post #4 of 32 (permalink) Old 04-12-2019, 03:26 PM Thread Starter
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Suspension mock up
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post #5 of 32 (permalink) Old 04-12-2019, 03:34 PM Thread Starter
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current state
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post #6 of 32 (permalink) Old 04-12-2019, 03:40 PM Thread Starter
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I don't have pics of them, but I bought a Duramax rolling chassis for the suspension, I traded a gun for a 94' 12v from a low hour Freightliner, and I just bought a 1994 second gen with a 12v for additional parts
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post #7 of 32 (permalink) Old 04-12-2019, 04:39 PM Thread Starter
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found some pics of the starting point
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post #8 of 32 (permalink) Old 04-12-2019, 04:41 PM Thread Starter
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The only truck I owned at the time was my F250, and we all know what FORD stands for! I built the tire carrier and went on a road trip
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post #9 of 32 (permalink) Old 04-12-2019, 05:03 PM
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Subscribed! Cool build!
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post #10 of 32 (permalink) Old 04-12-2019, 05:30 PM Thread Starter
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Originally Posted by EXSwap View Post
Subscribed! Cool build!
Thank you! I'm super stoked. I have not built anything this big and heavy before, I always built bikes and small tube frame street cars. This is the first large project I've had.
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post #11 of 32 (permalink) Old 04-12-2019, 05:39 PM Thread Starter
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My original plans have changed up a little. I started with 6x2 rectangular steel frame rails. They are plenty strong, but they looked spindly, so I am adding 2x2 to the rails to create 8x2 frame rails. Doing this helps the appearance, but it also adds significantly to the frame strength. I am not simply stacking 2x2's on top of the 6x2's, I am strategically placing them over or under and having the new joints be offset from the original 6x2 weld joints. Acts like inline "fish plates" giving significantly more surface area for welding the tubing together.

There's tons more welding to do, everything is just heavily tacked together. I am still going to add fish plates to the joints, or I'm going to sheet the entire frame length for a one piece appearance. I am going to round the angled corners and use 1/4 inch strip the entire top and bottom of the rails to make a smooth form look instead of the welded look. I want the frame to look like it was hydro-formed and not spliced together. Simply for appearance.

Weight is going to be a lot no matter. A 12v weighs what, 1100lbs? The cab is all aluminum and fiberglass but its 1000lbs. The super singles are 300lbs each, the 10 lug adapters are 40lbs each. The aam rear axle is 400lbs... It is adding up quickly. I'd love for it to weigh in the same as a 1/2 ton pick up (around 6000lbs), but realistically its probably going to be close to the weight of a 1 ton, around the 8000lb mark. Still an ultra-light when compared to a stock semi-truck.

Also, I'm thinking; why settle for 700hp? What about 1000hp?
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post #12 of 32 (permalink) Old 04-12-2019, 07:18 PM
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Subscribed. Why not 1000 hp? Tune it for the track, then retune it for the trip home. Cool build. Looks like fun.
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