When that happens i have to stop the truck and let it cool down and then it will shift ok as long as i dont rush it
May have a bad seal ring.gets hot sticks .no shift
3 possible senerios
Check the the fluid level is on the hot oil mark (in drive) on the dipstick. Too much oil will aeriate and overheat and lower operating pressure in the tranny causing band and clutch package slippage causing more problems adjust to correct mark
2-- have a pressure test done on the tranny for low operating prerssures from failing pumps and blocked filters.
3-- check oil lines to tranny cooler are not bent kinked or blocked
Check the oil colour It should be a bright cherry red but if it is dirty black or brownish it indicates the oil is burning and the tranny should be looked at.
SOURCE: 2002 Ford F150 5.4L hard shifting
Have you ever changed the transmission fluid flush and replaced the transmission filter?
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your check engine light mustbe on could be tps sensor
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The ford taurus is know for having a weak transmission, however if the transmission is serviced regularly you can avoid problems.
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my 1999 f250 super duty will not shift into overdrive
SOURCE: 1994 ford E350 E40D trans/7.3 diesel Shifts
the solenoids in the trans may be sticking,try adding 1 pint of dot 3 brake fluid to the transmission fluid and drive it for a while-give it a chance to work..the brake fluid acts like a cleaner and it makes worn seals and clutches swell a little.just drive it easy for about 20-30 miles,its only about $3.00 and it could save a $1,600.00 rebuild
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