RPM_Speed

      You might have a 4.11 or 3.73 rear end, but you've also got a slipping transmission.
   If it does 3200 rpm at 60 mph, it should be around 1800 rpm at 35, not 2500., in the same gear.
  Do the math, something's slipping.

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tyrodtom Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Sep/14/2007 Location: Virginia Online Status: Offline Posts: 1867	Post Options Post Reply Quote tyrodtom Report Post Quote Reply Topic: RPM_Speed Posted: Jul/23/2010 at 8:57am
	You might have a 4.11 or 3.73 rear end, but you've also got a slipping transmission. If it does 3200 rpm at 60 mph, it should be around 1800 rpm at 35, not 2500., in the same gear. Do the math, something's slipping.
	66 American SW, 66 American 2dr, 82 J10, 70 Hornet, Pound, Va.

dwilbs Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List AMC Apprentice Joined: Jul/23/2010 Location: NYC Online Status: Offline Posts: 36	Post Options Post Reply Quote dwilbs Report Post Quote Reply Posted: Jul/23/2010 at 8:16am
	Hi guys, I just completed 5 year restoration on a 68 amx with a factory replacement 401 engine in it. Took it out for the first time and it is running 3200 rpm at 60 mph - about 2500 rpm at 35mph. The tranny is the borg warner 727 and is shifting into 2nd gear @ 5mph and 3rd @ 15 mph. Not sure what the gear ratio is in the axle. Does this sound normal? I overheated 40 miles driving at 55mph.