Transmission Woe

[jasonsevilclone]

The 727 in my coronet has been a bad boy. The tranny wont engage in D I have to shift down to 1 to get it to catch then I can put it back in D. If I come to a stop with it in D the tranny slips and makes this whining sound, then I put it back in 1 and you can hear it catch again and it stops whining and drives off. This happened all at once and was not a slow process I have absolutely no clue about trannys and your help would be greatly appreciated. Thank You. Jason

[dwc43]

You need to take it to a tranny shop now. Not sure by your description, but it might be a sprag problem. If it is, dont drive it at all. If the sprag exsplodes it will destroy the tranny and the tranny tunnel too. Better have it checked soon.

[dave571]

There is a problem with the one way clutch that holds in first gear.

By manually shifting to 1 you are by passing it by applying the low/reverse band.

The last time I had a transmission do this, it turned out the one way clutch had caused the case to crack.

The one way clutch is quite a ways into the trans. The trans will be completely torn down to repair it(assuming the case isn't cracked.

If you have a spare, put it in, it will be way cheaper.

[ehostler]

I'm gonna have to agree with Dave on this one.

If Dura-Built transmissions is still around (I have lived in CA for many years), I would recommend taking the car to them or pulling the tranny and taking it to them.

About 10 years ago I had the 727 in my '68 charger go out (a cooling line sprung a leak and sprayed most of the tranny fluid on I-80 in Sacramento). I pulled the tranny and took it to Dura-Built. The only part that could be reused was the valve body. All other parts were destroyed. The rebuild was $500.

[George G. Leverette]

From what has been stated on this board, I thought 727s never broke. Now I understand why they have all of those tranny shops and after market parts houses for Mopars. Just had two 727s rebuilt myself.

[jasonsevilclone]

Whether it's the sprag or the clutch it looks like it's going to be a complete redo in either event. Damn, I was hoping it was going to be the filter ha ha. Looks like its time to give the Dart a tune up and shelf the Coronet for the winter. Thanks again for your help.