Mach 1 Mach 1 rpm question

Discussion in 'Special Production' started by swaftom, Aug 23, 2006.


  1. swaftom

    swaftom New Member

    Joined:
    Mar 28, 2006
    Messages:
    12
    Likes Received:
    0
    Trophy Points:
    1
    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.
    #1
  2. Crzyhrse

    Crzyhrse Active Member

    Joined:
    Dec 23, 2004
    Messages:
    1,636
    Likes Received:
    3
    Trophy Points:
    38
    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. :shrug: 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.
    #2
  3. TR03Mach1

    TR03Mach1 Member

    Joined:
    May 31, 2002
    Messages:
    451
    Likes Received:
    0
    Trophy Points:
    16
    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.
    #3
  4. carvermach

    carvermach New Member

    Joined:
    Oct 2, 2003
    Messages:
    23
    Likes Received:
    0
    Trophy Points:
    0
    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.
    #4
  5. DTMach1

    DTMach1 New Member

    Joined:
    Jun 14, 2004
    Messages:
    240
    Likes Received:
    0
    Trophy Points:
    0
    It doesn't really have anything to do with anything other than the 6-bolt crank/flywheel.
    #5

Share This Page