M6

[James_Douglas]

Hi All,

A friend just purchased a '46 Chrysler.

When taking off in low range and accelerating fast it shifts into 2nd gear as it is supposed to. However, if I go right back into the throttle hard and run it up into the higher RPM band it slips out of gear. I have to back out of the throttle immediately.

The body feels like the car is free wheeling. Once the RPM's come down it drops back into gear.

Has anyone experienced this and know what the problem is?

Thanks, James

[55 Fargo]

Could this be the kick down circuit, not functioning to allow the trans to drop back into 1st or 3rd if in high range.

Does this also occur when in high range, if you punch in in 4th gear?

[Dodgeb4ya]

Check oil level in trans as you know. The other issue as I just did a 42 Desoto Simplimatic that did the same thing- Always upshifted fine but under a hard full throttle acceleration always in low range it would kick out of 2nd high and go into "Scary" second low and feel like it was free wheeling as you said. Problem was a worn out free wheeling gear cam and rollers. Put all new countershaft free wheel cam/roller retainer and rollers in,no more trouble. In low range (High) all the power is transmitted through the 14 rollers and countershaft/cluster gear assembly ramped cam. If these rollers/cam/retainer are worn out they slip on the ramped cam causing loss of applied torque under heavy loads.

Bob

[James_Douglas]

Thanks Bob,

I remember hearing your description of the problem many years ago when someone else had this issue. But my memory is playing tricks on my these days...hence my question.

We did not run the car's RPM's up while in high range. I did not want to hurt anything as this drive was a a test drive prior to purchase.

It was a odd feeling to run the RPM up in 2nd gear (low range after the up-shift) and just at that point where you would shift to high range the thing goes into freewheel.

Someone that was not paying attention could kill an engine when that happened.

Thanks again, James