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I am fast approaching a point in time when I will need to install new motor oil in my GEP P400 engine. I have read the arguments pro and con until my Walmart readers fogged up. So I thought I would start this thread to ask for expert opinions. My P400 long block arrived from GEP in a crate...

Got the GM14020856 brace rod installed between my NP241 and the P400 engine block. Additional details in my rebuild thread.

Made a little more progress today. Got the GM14020856 brace rod installed between the NP241 and the P400 engine block. Also installed the bracket for the new transfer case cable shifter from JB Custom Fabrication...

Got my NP241 transfer case bolted up behind my P400/700R4.

Ditto what Barrman said. The OEM pumps on the CUCV engines were DB2829-4521. There are no magic bullets to improve significant power in the 6.2. One of the main Laws of Nature is - to produce power, fuel must be expended. There is no problem in increasing fuel to the 6.2. The problem is...

I looked back in my early photos and found a good image which shows the cast iron girdle of the P400. Also a recent photo of the inside of the bottom showing the integral main bearing caps.

To my knowledge, there are no new P400 engines available. In the past 4 years I have seen only 1 used P400 on ebay, and it looked like it had been run hard. Mine is not for sale. You may want to reach out to Leroy Linza in Houston. A couple years ago he purchased the last P400 long blocks...

In my opinion, no it is not close to the P400. The ad indicates that it is a remanufactured engine, probably assembled by Jasper or one of the other outfits out there from used parts. In contrast, the P400 engines were developed by GEP to power the new upfit HMMWV which weighs over 15,000...

No, that is a standard 6.5 GEP longblock, not a P400.

PM sent.

In my opinion, Accurate Diesel is simply instilling fear to sell new injector lines. Typical marketing ploy. I have been working on diesel engines for 35 years and bent many injector lines to fit with no problems whatsoever. Neither have I have ever encountered a rupture condition. But as...

Thanks Arlen. Mark Bendler found a good '91 NP241 with the mechanical speedometer to rebuild so I am good to go. I had rather have the mechanical speedometer anyway, because my goal for the entire project has been to eliminate as many electronics as possible. That is why I went with a built...

Received my NP241 transfer case from Mark Bendler at Kodiak Trucks in Wisconsin. Completely rebuilt with Tom Wood's Slip Yoke Eliminator and correct speedometer cable attachment. More photos and details in my rebuild thread over in the CUCV Modification forum.

Thanks everyone for your replies. I bought Energy engine mounts and Prothane transmission and radiator mounts. Bought the Energy on their website and Prothane on their website. Both sites had the option of entering your vehicle information (1984 K30 diesel) and the correct item popped up. While...

My NP241 arrived today from Mark Bendler at Kodiak Truck. I decided to go ahead and purchase another transfer case instead of re-using my original Np208 so that I could get everything mated together before installing the P400/700R4 into my truck. I made the decision to source a rebuilt NP241...

Hey Arden - in my opinion, your last video (posted above) was indeed better-produced and delivered more effectively than your earlier videos. I certainly believe you are on the Right Track. However in a spirit to assist you further, I looked back through my links to instructional videos to...

Perfect. Thanks.

Actually, my donkey is not sensitive at all. ;-)

Thanks Rick. I knew would have advice. I'm leaning towards Energy Suspension.