Re: Trans Fluid for a twin ultramatic? Power Steering fill mark and fluid?

Posted by Owen_Dyneto On 2011/9/21 10:48:16

Yes - there's a filter in the reservoir; any hydraulic system like that needs to have the finely machined parts protected from wear that can be caused by entry of dirt, etc. Just remove the cap and it's right there. And sure, it should be changed occasionally. Remove the entire large cover and the filter is retained by a bolt.

As far as transmission fluid type goes, it seems that most any fluid type has been used by someone with satisfactory performance reported. It's just speculation on my part but this might be worth thinking about: As far as I know today's "kits" have soft friction parts manufactured with GM-type lining materials (non-asbestos) so perhaps GM-type fluid would be an obvious choice. If the soft friction linings (bands, clutches) are original, NOS or NORS, then perhaps using a fluid more like the OEM fluid makes sense. Just a thought - no person observations one way or the other. I use Type F as was installed by the rebuilder (Ross Miller). I use the same fluid in the power steering.