Mach 1 Mach 1 rpm question

[swaftom]

I am hoping someone can shed some light on what appears to be another weird Ford decision. My 04 Mach has the 4r70w auto trans, with a 5800 rpm redline. I noticed on videos that the 5 speeds have around 6800 rpm redlines. Does anyone know why? Do you think there could be internal differences, such as cam specs, but that would be kind of like a bait and switch, or do you think Ford might be trying to keep the trans together for longevity by not allowing as high of revs? Any suggestions are helpful, thanks.

 

[Crzyhrse]

Yes, the 5 speed is 6,800. I can't remember but I think they made the auto 5,800 because it could'nt handle the high 6,800 RPM's without grenading. Also, the 5 speed has a forged crank as to the auto is cast crank. Maybe that has something to do with it also. I don't know, I'm not a mechanic.

 

[TR03Mach1]

Everything in the motor of an automatic equipped Mach 1 is the same as the 5-speed, until you get to the crankshaft/flywheel. The autos have a cast crankshaft and 6-bolt flywheel vs the 5-speeds forged steel crankshaft and 8-bolt flywheel.

I don't think anybody has thoroughly explained the rpm difference, but I have to assume it does have something to do with the longevity of the automatic transmission. The motor/trans setup in the automatic Mach 1 is pretty much identical to the Marauder and Lincoln Aviator.

 

[carvermach]

I have my rev-limiter set at 6600 rmps I go thru the traps at 6400 rpms no problems with 4600 miles on her. My last car 01 Gt same thing with 6300 miles on it. Just don't shift into overdrive a wot it will cook the bands.

 

[DTMach1]

It doesn't really have anything to do with anything other than the 6-bolt crank/flywheel.