This is for an 89 Grand Marquis. The car will shift into first and second but then shifts out of second but will not shift into third or overdrive. Then when the car has coasted to 35 it will shift back into second. Any idea what is wrong here? am I looking at a rebuild, I'm sure it could be one of several things, any help would be appreciated.

------------------
1 5/8 Hooker Competetion Headers, custom y-pipe,no cat, modified Flowmaster,Edelbrock open filliment filter with K&N filter in it
160 stat, BF G-Force w-rated tires, Hurst dual gate shifter

 

well the problem is that it's a ford(mercury) .though it sounds like the tranny just needs to be rebuilt.

------------------
'86 IROC 5-speed
305 LG4
edelbrock performer rpm intake
edelbrock 600 cfm carb
msd pro billet hei distributer
'95 3.23 rearend
hotchkis rear suspension
PST front polygraphite suspension