Re: Ultramatic low range disengaging

Posted by Tim Cole On 2010/10/13 18:38:39

Hi Ulrich:

After looking this over perhaps you are on the right track in looking at the throttle valve (TV). Let's suppose too much TV pressure is going to the regulator via the limit valve then mainline pressure to the low band might be wrong.
I have to admit I never tried misadjusting the linkage to see what happens to Low range.

TV is universal. The more TV pressure the more the transmission delays up shifting.

With Ultramatic, correct TV pressure will have Direct Drive engaging between 23-28 mph under moderate acceleration.

Now if you study those special TV tools in the manual you will see they are intended to provide uniform results for flat rate service times.

Thus, follow first principles and get the throttle rod in the right place at the transmission clevis and then follow the picture. With a little road testing you can get TV where it should be.

I have a 54 scheduled in the future for which there is too much TV and it shifts into DD too late.

Anyway, getting the High Range working properly might fix the Low range problem.

Let me know what happens.