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After reading this, I'm now considering to run the run-flat inserts on my two fronts, soon to be 16.00-20's. If anybody has 2, please get ahold of me, thanks. Would need whatever it takes to make it work, bead locks, or whatever.

Pretty cool. How can anybody in this hobby not like big crazy pipes? If it is stainless tube, I would not cover them for rain. You could sell quite a few of them here if you really wanted to. Thread should move to 5T mod dept.

Thanks on the T-case check. Interesting. OK, so I have some basic dimensional data to compare the stock Allison MT654CR automatic 5 speed to the Fuller RTO-12513 13 speed trans. The 13 speed dual countershaft trans lists as 3/4" shorter, 3/4" wider, and 7.5" shorter on height. The Fuller...

I don't want to clog this thread with a de-rail, I'll do a write-up of the ISL transplant as it proceeds. It should go quick actually, being the same dimensions as the 8.3L. Electronics are nearly all self contained. The ECM is on the engine, hence you only need to supply constant and...

I'll post a comparison of the dimensions later today. Current trans is the stock MT654CR, proposed trans is a Fuller RTO-12513 (13 speed w/OD). Vehicle is 925a2. I'm changing the engine to a 2005 400hp 8.9L Cummins ISL, but that is the same externally as the 6CTA8.3 that is in the vehicle...

May have the clutch linkage solved. Hydraulic is available.

What?

Challenges are clutch linkage and t-case rotation or lowering or sliding back to lower front prop shaft to clear double countershaft type transmission.

Turbo big block is pretty fly. Should be the best of both worlds. Those that do it seem to have EGT's in the basement, I'm guessing because they have not upped the fueling rate? One would presume you can go a lot more fuel than where you are at now (lower button #?)? Nice job, regardless...

Good call !!!

You could add a simple 4 pin relay on the 12v side after the ig switch to flow up to 30 amps from a larger wire direct to battery, if you wanted things to automatically shut off when you shut the ignition off. Or, go straight to battery with no relay, but don't forget to shut the radio off or...

Hi Randy, welcome. The radiator cap is a conventional type, so you can easily pressurize the system to find the leak. Don't go higher than the pressure rated on the cap though, say 10psi to be safe. The radiator has "tanks" on each side of it, and they are secured to the main core with what...

There is valving in the main driver side steering gear box that determines if the pressure from the PS pump is utilized or simply recirculated. Sounds like this could be your issue, if you believe pump is OK.

Not for the engine you asked, but check out this nifty one for the 8.3L, block mounted. I think the turbo oil return is in the way of making this one work on mil engines, but quite nifty:

We'll start a +400hp club. Get some.

Cute on rings. I will buy the 6 speed Allison from him if it has a PTO plate on it. If not, then probably not. Motorhome trannys (3000 MH) may not have them.

It is a 2005 engine, but I am still going to stuff a new rear crank seal in it while it is out. I will likely transfer over my 6CTA flywheel housing, fan drive, and exhaust manifold, to keep everything at the same locations. Oil pan too if need be for front axle clearance.

Nice job. Not cheap! We need 8 to do all? Smells like a $1,000 ordeal. But I do see several stories of these coming apart on people.

Got the mechanical to electronic throttle interface solved. Cummins actually makes a control adapter for marine. That was easy. This will handle the throttle and trans modulator cable, all with the stock pedal. Next step, get the 400hp 8.9L ISL engine out of the RV, up here, and ground run...