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Old 04-27-2019, 07:18 PM   #1 (permalink)
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Race truck!

I am currently building a 4600 class Toyota truck for KOH 2020. I came back from the 2019 KOH, parted out my truggy, bought a Toyota truck and started building.
Specs-
Toyota truck
22r on GotPropane
W56 transmission
Marlin ultimate dual transfer cases
OEM Toyota front axle housing
4.88 gears Detroit locker
OEM Toyota rear axle housing
4.88 gears spool
TrailGear leaf springs front/ rear
Fox 2.5s with reservoir
35 DOT Krawlers
15 DIY bead locks

Old build thread.
https://www.pirate4x4.com/forum/toyo...ta-truggy.html

Truggy last ride and disassembly.



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Old 04-27-2019, 07:21 PM   #2 (permalink)
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The Race Truck!



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Old 04-27-2019, 07:50 PM   #3 (permalink)
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Laying out some measurements for the cage. Measure, cut, notch and weld up some 1 3/4 .120 wall DOM for the main structure. 1 1/2 .120 wall DOM for the bumpers.







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Old 04-27-2019, 07:58 PM   #4 (permalink)
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hells yeah

save weight at every possible chance you get, looking forward to seeing this get built up. air bumps are now class legal
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Old 04-27-2019, 08:22 PM   #5 (permalink)
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Yea man, I got some air bumps! Trying to keep this as simple and light as possible. A reliable trail rig with racing stuff.

Toyota axles with all the normal weld on stuff. Diff stud eliminator, fox 2.5 12 and 10. Freshly rebuilt 4.88 diffs along with my old Detroit locker thats all blown up.








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Old 04-27-2019, 08:42 PM   #6 (permalink)
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what is the plan for the rear bumper? It looks big, like slap that ass and hold on for the ride big. Are you not concerned about horrible drop off angle?
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Old 04-27-2019, 09:16 PM   #7 (permalink)
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why 4.88s instead of 5.29s?
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Old 04-27-2019, 09:20 PM   #8 (permalink)
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Quote:
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what is the plan for the rear bumper? It looks big, like slap that ass and hold on for the ride big. Are you not concerned about horrible drop off angle?
LOL, I made the bumper stick out so far because the bed was bobbed. I am trying to make it the same length as it would normally be so I hopefully wont have any issues with tech inspection.
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Old 04-27-2019, 09:46 PM   #9 (permalink)
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why 4.88s instead of 5.29s?
I had 3 diffs with 4.88s already, one was new. I might swap them out for some 5.29 down the road.
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Old 04-27-2019, 11:16 PM   #10 (permalink)
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Gear it so you can run in 2.28
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Old 04-28-2019, 06:19 AM   #11 (permalink)
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That front axle gusset you welded on will result in a bent housing. Id fix it before you wheel it.
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Old 04-28-2019, 10:41 AM   #12 (permalink)
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Quote:
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Gear it so you can run in 2.28
My crawl box is 2.28.
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Old 04-28-2019, 10:51 AM   #13 (permalink)
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My crawl box is 2.28.
i think that was his point

How fast can your suspension keep up running in the desert/sand?

gear it so that you can hit that speed redline 4th gear with the crawl box in low range
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Old 04-28-2019, 11:01 AM   #14 (permalink)
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Quote:
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That front axle gusset you welded on will result in a bent housing. Id fix it before you wheel it.
Racing with stock housings is a waste of time anyway.
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Old 04-28-2019, 11:22 AM   #15 (permalink)
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No tubing bender? I noticed every bar in your cage is straight and sort of Lincoln logged together. Never seen a cage built like that before.... Any worries about passing tech?
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Old 04-28-2019, 11:53 AM   #16 (permalink)
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No tubing bender? I noticed every bar in your cage is straight and sort of Lincoln logged together. Never seen a cage built like that before.... Any worries about passing tech?
I designed it based on a couple of current cars running in 4600 and 4500 classes.
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Old 04-28-2019, 12:06 PM   #17 (permalink)
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No tubing bender? I noticed every bar in your cage is straight and sort of Lincoln logged together. Never seen a cage built like that before.... Any worries about passing tech?
i see lots of trophy truck chassis with only one or two bends throughout the whole chassis, typically the A and B pillars
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Old 04-28-2019, 12:38 PM   #18 (permalink)
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i see lots of trophy truck chassis with only one or two bends throughout the whole chassis, typically the A and B pillars
So have I. JHF buggys and the Goatbuilt buggys as an example, only have one or two bends in the chassis. Never saw a chassis built with zero bends though...

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Old 04-28-2019, 01:54 PM   #19 (permalink)
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Quote:
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So have I. JHF buggys and the Goatbuilt buggys as an example, only have one or two bends in the chassis. Never saw a chassis built with zero bends though...
i did my cab cage like that on my pickup, rolled it over a few times (yeah all low speed) and never had any issues with it.

Nodes are effective as long as they are braced and welded properly, no reason it would fail tech. straight tubes are, in a marginal sense, stronger than bent tubes.

consider that whenever you bend a tube you are changing the dimensional shape of it, either by smooshing the cross section or by thinning out the walls.
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Old 04-28-2019, 04:29 PM   #20 (permalink)
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Junk in the trunk.
Done-
Spare tire mount
Propane tank
Battery box
Spare coolant
Floor jack
Triangle reflector
Breaker bar with extension
Ammo can for tools
Number plates
Rear lights

Need to do-
Ammo can for spare parts
2 Fire extinguishers
Fresh air pumper
Antenna mount and a few other things.



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Old 04-28-2019, 04:57 PM   #21 (permalink)
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Looks like a lot of the inner fenders and core support was cut out, how do you plan on justifying that against the rules?

Quote:
Front inner fenders must be complete and unmodified, with the following limitations
and exceptions: outer fenders (wheel well openings) may be trimmed for the single
and exclusive purpose of allowing for tire clearance.
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Old 04-28-2019, 05:41 PM   #22 (permalink)
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Talking

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Looks like a lot of the inner fenders and core support was cut out, how do you plan on justifying that against the rules?
The inner fenders are still there. Core support did get a little trim, dont worry about that little guy

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Old 04-28-2019, 06:10 PM   #23 (permalink)
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Racing with stock housings is a waste of time anyway.
This would concern me as well.
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Old 04-28-2019, 08:41 PM   #24 (permalink)
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stock housing works fine if you truss it from steering stop to steering stop, he almost did

i beat my stock trussed housing like it owed me money, stole my girl, called me a jeep fanboy, and it held up just fine

keeping chromo birfs alive is the problem once you properly build the rest of the axle

Last edited by rockyota83; 04-28-2019 at 08:42 PM.
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Old 04-28-2019, 09:20 PM   #25 (permalink)
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Ok, so move the front truss out to the steering stops. Start saving up my pennies for an aftermarket Toyota housing before KOH and look into swapping my 4.88s for 5.29s.
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