NPR 4wd conversion and camper build thread.

[Coachgeo]

Most the pics in your Camper Box thread do not work.

 

[pappawheely]

Most the pics in your Camper Box thread do not work.

Photobucket is down for maint.

 

[Coachgeo]

Photobucket is down for maint.

Sorry should have mentioned I checked for that. They are not Photobucket images.

..../scontent-atl1-1.xx.fbcdn.net/hphotos-xat1/v/t1.0-9/11222585_730697453706818_5800400999854313218_n.....jp..?oh=3cb081f6577a4330e635690a8cb2d970&oe=561F0A48

 

[javajoe79]

Yeah facebook changes the links occasionally I guess. Best to just go to the photo album on FB

https://www.facebook.com/media/set/...073741866.411780185598548&type=1&l=b392444240

 

[Czechsix]

Looking good so far.

 

[javajoe79]

Thanks! I am second guessing myself on the gearing department though. I haven't bought any gears but does anyone think that 3.73 is too tall for a 37" tire?

 

[Czechsix]

Thanks! I am second guessing myself on the gearing department though. I haven't bought any gears but does anyone think that 3.73 is too tall for a 37" tire?

Depends on the use.


For this type of powerplant, I'd usually opt for a taller gearset to get out to the trail - there's still a crapton of usable torque from a 6BT, even at low rpm's, for trail use.

Also depends on what the split is for 1st gear, if that's a low sucker then I have no issues running taller axle gearing.

 

[javajoe79]

Here are the Allison ratios 3.10 1.81 1.41 1.00 0.71 No plans to tow much at all but there will be some mountain driving and plenty of offroad

 

[javajoe79]

If I went with 4.10 gears, 1800rpm would be 69mph. That seems doable too. I don't imagine needing to go faster than that.

 

[javajoe79]

Made some progress on redoing the 4 link today. I set the axle at a 120" wheelbase and started playing around on the 4 link calculator. Ended up with about 80% anti squat with this setup.

If anyone has any input on spring rates I would love to hear it.

 

[DzlToy]

Joe,

I have run RPM calculators until I almost passed out and 4.10 definitely seems to be the sweet spot for a 37" tire cruising at normal highway speeds. if you are in a construction zone or the like, you can always shift into fifth. A friend has a 6.7L in a 2500 and it will cruise at 1200 rpm with 35's no problem. That is an empty stock Ram though.

6B is happy from 1600 - 1900 rpm, so if you can stay around those numbers, you should be good for power and MPG.

 

[javajoe79]

Good info man! Thanks!

 

[corrupt]

Ahh suspension calculators, spent so many hours punching in numbers while building my 4x4 buggy, I feel sorry for you.

 

[javajoe79]

Ahh suspension calculators, spent so many hours punching in numbers while building my 4x4 buggy, I feel sorry for you.

Yeah it makes my head spin a bit. Luckily it wasn't far off. I just shortened the upper arms and redid the frame mounts. Didn't mess with the axle mounts.

 

[javajoe79]

Today I got the camper box back on the frame and mocked it up in the location it will eventually mount. Then I trimmed off some of the back of the frame and fabbed a bumper with recovery points and a hitch receiver. I had some 3"x5"x.187" tubing left over from a project I did so I used that. I have a really good looking departure angle now and plenty of room above the tire for suspension travel. The truck is pictured at what will be ride height. I have about 6" of travel up from there and hoping to have 6" of droop travel if I can package a spring and shock with enough travel. I'm looking into some custom wound coil springs and some KING shocks.