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I can't remember how fast my M809 would go in low 5th at 2100 rpm. I feel like.... 30? She spins s a little faster now and has 395's but if could find the stock numbers (which I did once :( ) I could calculate it from there. Thanks guys.

I already spent over an hour searching the forum. Scrolling through 15 page threads etc., so I tried. I found mention of them, but that's it. I paid my dues! Where are they!

This is a big ask, but does anybody have the dimensions of the exhaust manifold where the muffler bolts on? The dimensions between bolt hole centerlines, the diameter of the exhaust outlet, the overall dimensions of the flange…? It would save me about a 5 hour round trip drive if anybody does.

Long term plan for this truck is to be a MadMax type rig for living in when I retire. 40' trailer for shop/living quarters built on log trailer suspension, so I can take it off road a little. Cab will be a '53 International Metro van body. Anyway, I'm adding a K31 turbo. It's the type found...

Beside's the obvious advice of "get another rim", has anybody had any luck with repairing a rusty, pitted rim where the tire bead seals? I'll clean it up with a wire cup brush on a grinder and get it clean first, but I was considering some filler to fill in a couple if pitted areas before I...

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)...

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...

I have an M820 chassis cab (so the extra long wheelbase) that I am modifying into a tractor using a '53 International Metro van body as the cab. I'm sliding the tandem all the way to the back of the rails, moving the Rockwell transfercase back and (I'm thinking atm) I'll add a Spicer 7041...

I have an M820 I plan to modify extensively into an "expedition rig" over the next 12 years when I hope to retire. I'm just tinkering and playing with it now, slowly adding things that will eventually come together. The end goal for the engine is turbo, piston coolers (I have a machining and...

Anyone done the pinion seals before? I got a couple leakers. I see the seals are readily available and cheap. Just wondering how much of a fight that nut/bolt holding the pinion "yolk"? will be once I get the drive shaft out of the way. I'll also check the axle vents before I go tearing...

I've built a couple small trucks with unconventional drivelines with good results (16 speed Land Rover, 5' extended driveline Range Rover). This is my first class 8 truck. I have an M820 chassis cab, so extra long wheelbase, plus I'm sliding the tandem all the way back on the frame rails...

I know I found the specs for max input torque once... but I can't find them now. I'm turning up my 250 and I'll be pulling a 30k trailer. I was wondering if any of you who have already tuned up their 855's or swapped them out for a bc350, 400, etc. are still running the 6000 series Spicer and...

This is probably a bit early to start a thread but I figured it would leave me more time to get advice and I could share more of the process. I just bought a '71 M820 from Eastern Surplus. It's just the chassis/cab, no van body. I wanted the extra long wheelbase, I wanted to shift gears, I...