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Changed the oil last night and this am the gears are hitting very hard ( automatic) . No lights came on just when time to shift it hits hard to ppoint of jerking and you can hear it.
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If the transmission was rebuilt 2 years ago the fluid and filter did not need to be changed. In a 1981 there are no trouble codes to retrieve so whoever suggested that is out to lunch, Unfortunatley you need to get the transmission rebuilt again, hopefully it gets done better this time. Using the dexron oil in Ford transmissions is something transmission shops do because they don't want to stock different fluids. While it's not likely that using dexron oil lead to the failure it would be better to use mercon or type F oil.
It sounds to me like the transmission is starting to fail. As the clutches inside the transmission wear the clutch pack gains additional clearance. Your pressures in the transmission will be higher with cold oil so it has a tendency to build a bit of extra pressure, but it's also slower in flowing through the transmission. This results in a harder hitting first gear. As the transmission warms up, it will reduce the viscosity of the oil and work fine. Cold weather kills automatic transmissions. Let it warm up before driving it or it won't last long. It will require an overhaul soon.
The high viscosity ensures transfer of lubricant throughout the gear train. Some modern automatic trans-axles (integrated transmission and differential) do not use a heavy oil at all, but lubricate with the lower viscosity hydraulic fluid, which is available within the automatic transmission.
When was the last time you had your oil changed? That could be the problem. Change oil so the shifting smoothens itself out. If that doesn't work, have a mechanic take a look at the clutch to root out the problem.
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