Re: trans troubles

Posted by HH56 On 2015/11/9 10:57:34

If you could describe the noise and also define what you are calling high range we might be able to come up with some better ideas.

If you have the selector on D and mean the first shift into high (the only actual shift the transmission makes) then noise at that moment is something I don't recall anyone mentioning. You have a band loosening and clutches applying almost simultaneously. If timing is not perfect and things did not move in the right order it could result in both being applied at once and some bogging and maybe noise. The usual complaint at that shift which Packard called "flare" was low released quickly and high was slow coming in so it would almost be like the car was in neutral for a moment. The engine would speed up which you would hear and then have to slow down abruptly as the high range clutches took the load. That results in a rough jerking shift and a lot of heat and wear on the high range clutches.

If you have selected H (or are in D after it shifts into high) and you mean it is happening at the final transition as it goes into direct drive then a noise is sometimes heard if the direct drive clutch plate lining has hardened or glazed over. It has been described as a groan or a cow like mooing sound which goes away once the clutch is fully engaged or if you let off the gas while the transition is taking place. If that is the noise, most just live with it and help keep it silent by letting off the gas for a moment while the clutch applies.