My 92 F150 four wheel drive with E4OD was running fine till I parked and shifted to PARK, when a grinding noise was heard. Now truck will not pull in any gear forward or reverse. Will not shift back into PARK with engine running. Engine rpm drops slightly when moving from PARK or REVERSE into any gear, but absoloutely no torque being applied to drive shaft. Previous owner has removed front drive shaft and four wheel drive selector is frozen in normal position. Whatcha think? Bill: ebaysfun@hotmail.com. Thanks.