Re: Twin Ultramatic Shifting

Posted by Hotrod On 2008/5/23 0:14:44

Thanks for all the good info. I should be able to get to this puppy in a couple of months.

It consistently does NOT shift when I'm in the "D" position regardless of my speed. I've even tried de-celerating to get it to change out of 1st gear, but it still does not change. However, once in a blue moon, it surprises me and decides to shift when I least expect it to. When it does shift, its at around 10-15 mph and I'm not accelerating hard.

Since I'm guilty of having a heavy foot, am I correct in understanding that I should use the "H" position more so than the "D" position? Under what situations would I use the "D" position?

Before I tear into the tranny, are there any additives or fluids I could use to unstick any sticky valves if that is the problem? Also, would my using Dextron II have anything to do with it not shifting out of 1st gear?


My '56 Senior pushbuttons are on the right side of the column, is this what you mean by "Drive-right or Drive-left"?