95 ford f350 won't shift when cold.

I had an 81 with a bad slave cylinder that would act up like that. In the summer I could shift just fine empty and it would slip loaded . bit in the winter it acted like there wasn't a clutch even there. I later found out the previous owner in a pintch had put in atf.

Would it be better to put a stock slave cylinder back in or go aftermarket?

It all depends on what you expect out of it I suppose. With the pretty big price gaps and not 100% certain this will fix the issue if it was me I'd buy an oem or comparable one. If its under a 50-60 dollar fix I'd say u won that fight... Change it, bleed it and bleed it again And then go from there. The one I had got for my 81 I think was like 25$ at the time and I never had an issue with it.

Okay I will try that. Thanks man I'll be sure to post how it turns out

Okay I will try that. Thanks man I'll be sure to post how it turns out. So how did it turned out??