Take this for what its worth.....I told the guy i just wanted his professional opinion and i wouldnt throw him under the bus for it.

just talked to a chemical engineer with royal purple. he said running synchromesh or 75w-90 would be good either or...75w-90 he said would be obviously notchy when cold..I told him ive seen pictures of the synchros in the mt82 and they are just old style looking surfaces, no carbon lined. its also odd as per fords lubrication it calls for QS but they are supposed to have QDC according to the manual and the new TSB.

http://www.fcsdchemicalsandlubricant...ission%20Fluid

I think mine must have QS in it (75w-90) its a thick darker fluid