Cummins 4BT & Diesel Conversions Forums banner

1 - 11 of 11 Posts

·
Registered
Joined
·
110 Posts
Discussion Starter #1
Anyone know this rig? He left before I could talk to him. Diesel, definitely didn’t sound like your normal 4bt, and sits awfully low for it to be that engine.


IMG_2254.MOV
 

·
Registered
Joined
·
110 Posts
Discussion Starter #2
Ah dang it. I’ll have to figure out how to put in a video. Here’s a screen shot from the video.

128171
1590070849158.png
 

·
Registered
Joined
·
147 Posts
Not truly a "Power Wagon", but lots of folks call them that. Its an M37 Dodge military truck, and 4bt conversions are pretty common in them. Appears to still have original axles, and they are typically gearbound due to the low gearing and the lack of different ring and pinions available. I think there are 2 choices, with 4.88 being the highest ratio. Looks like short tires too....looks like a 50-55 mph top speed rig to me, which is fine for just tooling around.
 

·
Registered
Joined
·
110 Posts
Discussion Starter #4
@TheJeepGuy yeah, I figured ‘Power Wagon’ would catch more people’s attention. My uncle has two, one with a 4bd2t swap and D60’s. Josh ‘Coog’ is local to me and has a few as well. I think the stock gearing is 5.38 or something. Even with 4.88, I can’t see a 4bt being comfortable at 50 or 55. And I don’t think it would be easy to keep it that low with with the tall 4bt.
Hopefully someone chimes in, I’d love to read a build thread on it.
 

·
Registered
Joined
·
11,225 Posts
The stock tires on the M37 was a 900x16 which is 35" OD or a tad more depending on tread. If it had the military Spicer 3053A transmission which has a .85 OD you'd be pushing 2390 RPM @ 60 MPH. If you had the NV4500 which has a .73 OD you would be running 2053 RPM @ 60 MPH which would be much better. You'd only be turning 2224 RPM @ 65 MPH. Might get a bit scary in that vehicle. They weren't really designed for interstate cruising. Most of the time they probably ran 45 MPH or less.
 

·
Registered
Joined
·
110 Posts
Discussion Starter #7
Yeah, I know. I was just seeing if anyone knew the owner or build by chance. Is this in the wrong section? I’m intimately familiar with the M37, don’t need any answers on trannys and axles. Hoping to find a build thread.
 

·
Registered
Joined
·
141 Posts
The stock tires on the M37 was a 900x16 which is 35" OD or a tad more depending on tread. If it had the military Spicer 3053A transmission which has a .85 OD you'd be pushing 2390 RPM @ 60 MPH. If you had the NV4500 which has a .73 OD you would be running 2053 RPM @ 60 MPH which would be much better. You'd only be turning 2224 RPM @ 65 MPH. Might get a bit scary in that vehicle. They weren't really designed for interstate cruising. Most of the time they probably ran 45 MPH or less.
Stock fifth gear on all 3053s is .78:1
 
1 - 11 of 11 Posts
Top