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The pintle tow rating is doubled to 30K for road use. The M818 is 55K "on the 5th wheel", highway. Those aren't vertical hitch loads. I'm pretty confident the 30K rating is fairly conservative, since they spec'd a pintle hitch that's rated to 100,000 lbs. The tandem has 7" wide drum air...

It is a long story, but I have a use for the tandems, long term. I can’t sit the boat on a flat deck trailer because of the prop, rudders etc. Basically, nothing exists that I can buy to haul the boat and keep it under 14’ tall, so since I already have the tandems, I‘ll build one and the steel...

It‘s a long story, but I’m using the running gear (tandems) from a log trailer with a 35 ton load rating to build a trailer big enough to haul my steel hulled, 40 ft landing craft. Low boy style. Trailer with boat will be about 40k with 15k on the Pintle. Towing with my M820 (box removed)...

Tan buggy! That bi#ch is one cheap hot rod!

He sure does. His rail pressure must be sky high. He's having a lot of fun though!

Just came across this wily bastard. He’s nothing if not entertaining and he sure likes turning up 5 ton 855s.

I finally pulled the trigger on a 7041. I might be misinformed, but the trans has to have an input torque rating of some kind. What I've found is that in the case of the Spicer auxiliaries, the first two numbers (x 100) is the rated input torque. So the 7041 would be rated for 7000 lb ft...

What! I can‘t hear you. Haha. I did wear ear plugs earlier this week. Picking up a log trailer put a little load on it and it really barked (with the temporarily straight piped stack). I had to pull it up a steep hill down cobblestone main street to avoid the highway (bad tires on the...

Good to have confirmed. I’m building a container hauler out of a log trailer (off-road suspension) and came to that conclusion… The dual axis hitch (plus the 46” tires) put me around the same height on the 5 ton. I’ll be nervous under my first bridge anyway.

For my 2 cents, I drove my M809 from PA. to Florida, to Seattle and the exhaust was not bad. The rest of the mechanical noise with zero insulation was much worse but I didn't find it that bad at all, really. I have Goodyear 395's and went around 60 mph on gps at 2100 rpm. I straight piped...

I just took a quick look so maybe I’m wrong but I think the ‘78 article was about a formula 290 big cam engine, which was specifically designed to run at a lower rpm (to increase efficiency), so doesn’t really compare to the 250. Or a small cam 290. I don’t know all the changes made, but I...

Any information whatsoever as to what set up you ran and what problems you had would be greatly appreciated by me. Specifically, boost pressure, rail pressure, EGTs, rpms you loaded it at, etc.

I haven’t added my turbo yet so this may not be beneficial, but I did put a #15 button in and while my EGTs didn’t go over 950 on hills ( I also had no load), my rail pressure would go up to 270 if I let it. I kept it at 210 or less which is where I want it. Based on that alone, I ordered a...

Pressure lines would be external. I'd drop the pan and drill the holes into the block from the outside. I'd have a plastic vacuum nozzle cut at a 45 with a hole in it that the bit goes through., up against the block. So I'm drilling in a vacuum. When the bit breaks through, the majority of...

I have the truck parked up North, so I can't take a look. If I win the auction for a log trailer this Thursday, I'll be up there next week, using it to tow it home. I'll get the CPL then. I probably should have written it down by now. I appreciate your help. All I know about it is it had a...

I don't know. I assumed the NHC250's came with non top stops, but your question makes me think I was wrong to assume that. I believe it's original with 30,000 miles on it (and 1,000 hours) but I haven't had them out yet. I'll be pulling a 30k trailer for personal use, so not working too hard...

Like many, I'm tuning my 250 up a little. I've built lots of motors but not a large diesel before, so most of my knowledge is only from reading. I also know many active people on this forum have hands on experience with small and big cam Cummins. All I've done so far is a straight pipe and...

Just looking at pictures, it looks like the 8341 has yokes close in size (or the same as) what's on the truck now. It also looks like the 7041 has a different size yolk on the input vs the output. Smaller on the input I believe. I expect I'll have to do some machining to get things to match...

Thanks Topo! I appreciate you responding and I appreciate hearing from someone with experience with one. That was exactly what I was hoping to hear. I'm gonna pull the trigger on a 7041. They seem a little easier to find, a little cheaper and if it held up to what you used it for it'll be...

Thanks Topo! Did the Mack with the 290 also have a 7041? If so, I'd be curious what your GVWR or GCWR was. My Cummins will be tuned close to that and be running around 60k I'm expecting.