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Hmmmm, I put 85W 140 in mine. A buddy told me thats what hes put in his 833s since he bought his '67 GTX brand new. I haven't driven mine yet but you can absolutely rip powershifts with his 833




85W-140 is fine, but it's a crutch for a worn box IMO. A worn 833 will not agree with syn or lighter weight fluids. I drove an NP435 quite a bit with Redline MTF. It shifted well, but did find the weak seals for me.

I want my fair share