That's the truth! Unless you've been jamming gears for 25-30 years, you shouldn't be allowed to have an auto OTR truck

LOL... What some people dont know about automatics and why they are better...

We are not talking about a turbo350 here people...

I was measuring today for a RoadRanger FSO-6406. :humm:

^^ what kind of tranny is that?

Looks like an Eaton 6sp with overdrive?

Yep. Eaton Road Ranger. They're found in medium duty box trucks, dump trucks, etc. I had one in a Ford F800 box truck once and LOVED it. Its a tiny bit old-school in its shifting feel, but what wonderful ratios. Big, beefy, quiet, and able to take about 1800 ft-lbs at a GVW of 66,000.

now when you shift, how much does it drop in RPM?

I would love to tell you, but my E350 cargo doesn't have a tach :scare2:

I do know (as with all my previous automatic powerstrokes) that the converter lets it stall a good bit until lockup so its hard to tell. I have no issue with the way it puts torque to the wheels or the trans ratios (as long as the shift points are properly programmed), just with the fact that even flawlessly maintained E4ODs tend to die a relatively early death... as mine is starting to do at 106k despite flawless maintenance, stock software, and always disabling OD when towing.

The E4OD/4r100 is a pretty good tranny, but compared to what I can do with a wisely-chosen manual, its pretty pathetic. The few FSO-6 speed trannys I've had were reliable up to 600k, and even behind a Cummins that was limited to 2500-rpm they did a great job. That's not to say I'm putting a 370-lb FSO in my van, but I can also build a pretty stout NV5600.

I rarely need the granny-low, but its all math; finding the right rear ratio to match the tranny and torque curve of the engine.

well if you do the NV5600, keep us posted. i found a company that advertises a direct bolt on for thw NV5600 to a powerstroke but i think they went out of business.

SAE bellhousings should get me there, but they're tough to find for the NV5600. I could do the ZF-S6, but have you seen the prices on those? Crazy.