Re: Modern transmissions??

Posted by Peter Packard On 2009/9/4 1:01:41

G'day all, I would stick with the Ultramatic/ Twin-Ultramatic. They are a very good auto. They have a few interesting design features which often catch even experienced rebuilders of other automatic transmissions out. The main one is that the Ultramatic uses the pump and mainshaft bushes as seals, in which a small amount of wear on the bushes and/or shaft has a dramatic pressure impact, particularly with the operation of the Direct Drive clutch. The other trap is that the converter balance is critical. Many rebuilders pull the converter apart without adaquately marking initial assembly positions of the exernal and internal fixed components. The converter to front pump hub is held on by six, small cap screws at 20 ft lbs. A small amount of imbalance in the assembled converter causes this hub to loosen and results in a leaking converter and a very likely burned out trans. Check with Peter Fitch who operates a replacement overhaul service. He has a lot of experience with the Ultramatic/twin Ultramatic. Best Regards Peter Toet.