Re: Synthetic Transmission Fluid for Ultramatic

Posted by 56Clippers On 2023/6/5 17:25:52

I am running AMSOIL Super Shift Synthetic Racing Transmission Fluid in my 56 Clipper Deluxe. It has Ultramatic 540481 which is one of the carry over 55s. I started with this fluid with the rebuild so I have no direct comparison. It is a Type F fluid targeting minimal clutch slippage. I typically use Drive. Reverse, Low, and High all engage and shift smoothly and positively. Direct Drive engages softly and disengages easily on both acceleration and slowing. Kickdowns all work well and positively. Throttle response is very good. I have tested all six of the external pressure ports and the pressures are reasonable based on the test chart. I have had no temperature issues using only the stock oil cooler (I have a temperature gauge). The only thing I'm still looking at is the slightly low direct drive pressure when engaged at lower speeds. At highway speeds it is fine. I do not have any long distance travel to make comments on that aspect. Everything works well thus far.