Build Thread JHF Trail Chassis

woody

eternal noobie
Staff member
Oct 12, 2010
1,113
53
Toquerville UT
Jesse Haines Fabrication has released a new JHF Trail series chassis. This is one of the first production units. Plans are
  • 3800 L67 supercharged engine
  • 700r trans, full manual valve body
  • D300 transfer case
  • '05+ Superduty D60 front JHF portal Toyota 8" steer axle, 4.88s, spool
  • D70 rear with SD 60 steering JHF portal Toyota 8" steer axles, 4.88s, ARB
  • PRP seats and 4.2 harnesses
  • JE Reel drivelines
  • Radflo 2.5 16" air shocks
  • Milestar tires
  • Raceline wheels
  • OPTIMA YellowTop
  • Rugged Radio RDM-DB comms
  • PSC full hydro
Will update as more plans come together.

Test fitting seat position now.....engine is under 24" long, so plenty of space available. (Rear radiator)

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Lil Rich

Spotter Required
Media Partner
Nov 26, 2016
155
Sand Hollow
Just an idea to get some more headroom, what if you angle the drivetrain slightly to drop the seat a little bit more? How far off the belly is the drive train? And by the belly I mean the actual skid plate
 

woody

eternal noobie
Staff member
Oct 12, 2010
1,113
53
Toquerville UT
Just an idea to get some more headroom, what if you angle the drivetrain slightly to drop the seat a little bit more? How far off the belly is the drive train? And by the belly I mean the actual skid plate
eyeball clearances:
  • t-case to bellypan: 3/4"
  • rear of trans pan to bellypan: 1/2"
  • converter to front belly tube: 3/4"
With the seat on the test-fit cross bars, it's 1" off the top of the flipped D300 alum cover. Headroom is more than a fist (no helmet yet) Cozy, but perfect :)
 

OldRocDoc

Spotter Required
Dec 26, 2016
29
Should be a really fun build. I really like this chassis
 

woody

eternal noobie
Staff member
Oct 12, 2010
1,113
53
Toquerville UT
D70 disassembled, retube pending for the knuckles...and mocking up the 16" Radflo airs (zip tie skills)

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POR

Spotter Required
Jan 30, 2017
35
Nice!! That looks like a sweet chassis, is goatbuilt doing them? I didn't see them on their website
 

woody

eternal noobie
Staff member
Oct 12, 2010
1,113
53
Toquerville UT
I know you’re pretty tall, how is the headroom in this chassis?
With the seat ~7" off the bellypan (IE: super low), I have plenty of headroom. Need to put a tape on it to check however, but with my Axel helmet on, my fat fist clears the cage :)
 

knapp870

Loves Light Bars
Oct 23, 2020
4
Lincoln NE
With the seat ~7" off the bellypan (IE: super low), I have plenty of headroom. Need to put a tape on it to check however, but with my Axel helmet on, my fat fist clears the cage :)
I'm curious how an atlas may fit. The belly dimensions seem similar to my lizard and the atlas being taller top to bottom created quite the headache for seat packaging. I now see you and Rich are both running d300's so I guess time will tell. I'm guessing the wider B pillar will help with it though and potentially the engine sits farther forward...or back i suppose
 

Lil Rich

Spotter Required
Media Partner
Nov 26, 2016
155
Sand Hollow
I'm curious how an atlas may fit. The belly dimensions seem similar to my lizard and the atlas being taller top to bottom created quite the headache for seat packaging. I now see you and Rich are both running d300's so I guess time will tell. I'm guessing the wider B pillar will help with it though and potentially the engine sits farther forward...or back i suppose
With both the 300 and the Atlas clocked flat, there is only a 1” difference. I am running passenger side drop, while Woody is running driver side drop. For your lizard, you could always cut the seat a little bit (if you have a suspension seat like PRP or Beard) to afford about 2 more inches of room. This was a thought of ours until we put woodys drivetrain and seat in and realized we had plenty of room.
 

knapp870

Loves Light Bars
Oct 23, 2020
4
Lincoln NE
With both the 300 and the Atlas clocked flat, there is only a 1” difference. I am running passenger side drop, while Woody is running driver side drop. For your lizard, you could always cut the seat a little bit (if you have a suspension seat like PRP or Beard) to afford about 2 more inches of room. This was a thought of ours until we put woodys drivetrain and seat in and realized we had plenty of room.
My atlas is clocked down maybe one notch and passenger drop. Notching the side def may have been an alternative I didn't think about but would have to consider how far into the suspension seat you may compress on a hard hit(~4"?). I'm 5'11" and you wouldn't want to be over 6' in my lizard in current config (had a guy 6'2" sit in and try to buy it) but there are probable other better ways to do it. One thought was trying to use the low backs to gain some leg room and be able to sit the seat farther back in the chassis .

Love the builds guys!
 

Lil Rich

Spotter Required
Media Partner
Nov 26, 2016
155
Sand Hollow
My atlas is clocked down maybe one notch and passenger drop. Notching the side def may have been an alternative I didn't think about but would have to consider how far into the suspension seat you may compress on a hard hit(~4"?). I'm 5'11" and you wouldn't want to be over 6' in my lizard in current config (had a guy 6'2" sit in and try to buy it) but there are probable other better ways to do it. One thought was trying to use the low backs to gain some leg room and be able to sit the seat farther back in the chassis .

Love the builds guys!
Low backs will definitely help set the seat back. The idea with cutting the seat is that you wouldn’t want anything (obstructions) above the bottom rails and directly under your spine/butt. But on these rigs, the seat sits fairly far back behind the case itself, so cutting a bit of the seat out of the way (under the legs) isn’t a big deal. Especially if the tcase is clocked down.

No offense on some of the other builders like 801 or Kalif, but it is nice having a car that is comfortable for a larger bodied person like myself. The other chassis’ were just too small for me personally.
 

knapp870

Loves Light Bars
Oct 23, 2020
4
Lincoln NE
Low backs will definitely help set the seat back. The idea with cutting the seat is that you wouldn’t want anything (obstructions) above the bottom rails and directly under your spine/butt. But on these rigs, the seat sits fairly far back behind the case itself, so cutting a bit of the seat out of the way (under the legs) isn’t a big deal. Especially if the tcase is clocked down.

No offense on some of the other builders like 801 or Kalif, but it is nice having a car that is comfortable for a larger bodied person like myself. The other chassis’ were just too small for me personally.
That's a valid point and something I will look into for sure. The tcase is pretty much directly under the middle/front of my seats in the current config but I guess in front of what you would be compressing your spine into. Good idea!

Yeah, I totally agree the small chassis make things tight and interesting problems to work around and the belly dimension of this new JHF seemed close enough to my lizard to make me wonder. I was able to make mine fit me at 5'11" well, wheel 16+ hours and not be uncomfortable but it's pretty specific to my dimensions and could always use a little more stretch out room.
 

MNorby

Spotter Required
Dec 31, 2016
75
Axle change I see? Also allows to run the 300 in standard pass drop. That also help with your drivers seat height?
 

woody

eternal noobie
Staff member
Oct 12, 2010
1,113
53
Toquerville UT
Axle change I see? Also allows to run the 300 in standard pass drop. That also help with your drivers seat height?
Yep, decided to bite the bullet and go all in the first time....t-case drop won't necessitate a difference in seat height, I'll set both sides equally. (my wife wants to drive it, so I need a comfy shotgun spot!)

Lined up motor/trans position last night, mocking up mounts today.
 

woody

eternal noobie
Staff member
Oct 12, 2010
1,113
53
Toquerville UT
So, this will be fun....haha

First, welding up the engine mounts
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And, motor mounts installed....still need finish welding and bracing but the motor is centered and positioned.
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The passenger seat sits over the D300. Currently, it's 8" above the belly pan. Modifying the seat frame will easily allow for another inch of drop.

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Seat bottom to bottom of cage tube is 37.5"
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Now for headroom....selfie in the passenger seat
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And my block of wood headroom measuring spacer....the block is 6" long...

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