So here in Boulder, CO with Trailjeeps, I'm able to convert my 3.8L V6 to a Cummins 3.9L 4BT Turbo Diesel. I'm wondering what will need to be/should be done to make sure that my existing parts can handle the extra torque with no problems. I'm riding on 35s with 5.13 gears, manual transmission, and I would like to get at least 37s for my next set of tires which means I need to reenforce my axles.

Do you all think if I gusset and sleeve my axles that it should be enough? The other option I was considering was Dynatrac PR60s for front and rear (Go big or go home), but I would rather like to save up for a full coil over suspension and put everything on at once. Since my Jeep is still under the original warranty, I would like to keep the current parts I have now for longer while doing as little as possible to them.

Also, I was told that my gear ratio shouldn't make a difference with the conversion. Any one else have input on this?

Thanks in advance all!

 

Bump to a good subject

 

Will it pass emissions in Colorado?

I am guessing yes, since a dealer is doing the install.
Curious as well, love me some diesel.

 

The front Dana 30 is pretty tough in the JKs. Much stronger than what they put in the TJs. A sleeve and gusset job should be fine for a while at least.

What is this running you $$$ wise? Im very interested so keep us posted!

 

Emissions is still being worked out and Oliver from trailjeeps assured me that the paperwork will be completed NLT the end of this year. Also I have a 2011 so I am emissions exempt until 2014, so it should have no problem with emissions by then.

I also have a rubicon so I've got a 44 for my front axle. Is that more than enough?

The base cost is 21.5k (yes expensive) but I was told they would work with me on the price.

 

The price isn't too bad, but still a lot. It will last forever..
I would gusset (maybe the housing as well) that front and go!

 

sounds great. i was disappointed that they didnt put a 2.7 diesel in the wrangler this year. where are they getting the 3.9 liter? what are the torque numbers? i would be most concerned about the manual tranny. what manual tranny did the dodge rams run with a diesel? good luck.

 

I agree, that 44 is stout but a little extra insurance doesn't hurt. $21,500 huh? That is a lot but I guess it's based on how much you need it? This is def good info to have for when my engine meets the end of the road. Are they giving you a different tranny as well?

 

Have u looked into getting a the 2.8L VM Motori conversion? There are a couple companies do those now. From what u have been reading this is a lot quieter and lots less vibrations. Same motor from the 05-06 Liberties.

 

4bt with 37's on a D30? i think not. sleeves and gusset wont make the shafts any stronger.

even with a 44 its iffy on a stock motor. now with the 4bt i wouldnt even think of running 37's on a d44