rebuilt 904 not always shifting

69B-Cuda said

looking at the Lubegard Red, it says for use with all types of ATF except Ford type F. I am running a mix of type F and dextron/mercon (read on here that guys run a mix)... will that be OK to run the lubegard in it or do I need to change the type of fluid I'm running in the tranny? (was planning on changing it next time I change the engine oil anyway)

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I think it has more to do with the trans type requiring type F and not the fluid itself.
On thier FAQ's it says that "Transmissions that require type F should not have a friction modifier added because these transmission types require harder application of the friction surfaces, and that a friction modifier can cause slippage in these transmissions."

So it has to do with the trans type itself and not the fluid used.

It should be fine.

If you want to see the FAQ's they are here http://www.lubegard.com/faqs.html

Also, I beleive that running a mix of fluids is a waste of time and effort.
These tranmissions will run on used french fry oil if they had to, so mixing is just a little to anal about it in my own oppinion.
I use full type F purely because it has a little less slippage when clutches and bands apply, and I have made a few specific mods to my trans so I can casual daily drive it but it firms up nicely when I get on the throttle.