Not likely. There were several problems with ZFs back then; particularly, the force required to operate the clutch diaphragm. It cracked transmissions AND firewalls. If your truck's firewall isn't reinforced, look up the TSB about it here: Search Technical Service Bulletins
And check the Aluminum casting for the pedals - they can crack. Then look at the MC pushrod eye and the pedal shaft bushings...
Synthetic is recommended in trans and differentials nowadays for it's better ability to withstand extreme temps plus other benefits over non-synthetics. And the rumors years ago that switching over to it caused seal leakage proved to be nothing but an old (mechanic's) wives tale.
I'm going to have to disagree with you on that one. Some of the old synthetics did in fact cause gaskets to leak though I never saw seals leak. They would just pour out the gaskets, when the only thing that changed was synthetic oil after a long period of running common oil. The theory was that it washed all of the build up from the gasket surfaces and the brittle gaskets couldn't make up the difference.
That last one is pretty technical and dry to read, but the relevant line is: "In automotive applications, the first qualified synthetic crankcase motor oils were based entirely on ester formulations and these products were quite successful when properly formulated. Esters have given way to PAOs in this application..." , which means synthetic esters are not used in "synthetic" automotive oils now.
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