After driving at highway speeds for any extended amount of time, shifts VERY hard into first and second gears. If I shut the truck off for a minute, problem solved. Check engine light also comes on - will stay on for several days.
This morning my wife tells me it is doing the same thing - but sounds like a jet engine taking off! This without going over 35 mph.
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If tranny is manual shift you may have a bearing and or bad gear. Try changing tranny fluid. Check manual for correct fluid may use tranny fluid rather than gear oil. I recommend using Royal Purple fluid or gear oil. This very expensive but will slicken up the shifting and extend bearing and gear life.
what RPM's is it shifting at?If it seems to be shifting a lot more then usual it could be a torque converter problem(locking and unlocking),for now I would try having the tranny serviced and see if the shop can adjust the shift points,also check the tranny fluid for color,amount,and smell.It should be a pinkish to red color and not smell burnt,as far as checking the fliud level run it around until the vehicle is up to running temp and follow the instructions on the dip stick for proper procedure.good luck.
sounds like your pressure control solenoid inside your trans is sticking you will have to have your pan pulled and have the solenods checked or replaced since it only fails at times it might check out ok when the pan is pulled.
converter clutch regulator valve is worn causing line pressure to rise to maximum in turn causing your harsh shifts. Sonax makes a repair kit for it or you can install a stiffer spring to make it work correctly
it could be your fuel regulator located on the top of the right side of the engine a c clip holds it on and it has an 1/8 line runing to the top it tends to set off alot of sensors its about 68 dollars
First thing to do,try to pump your clutch before you shift into 1st gear then if you feel makes better, most probably you have problem with your hydraulic clutch system, check the clutch line if there is an evidence of fluid leaking or it could be internal leak.
Second thing to do, check your transmission oil, may be it' s too old or you use a thick oil thats why when cold its hard to shift then when the engine rich the normal temperature(warm) the oil become thin and the shifting will smooth. Remember the very old oil become thicken and the purity is gone and can cause of hard shifting. in this regards i suggest you to change the transmission oil and check the used oil if there is small peace of metals, then you are in big trouble,
The problem sounds like your kick down cable has gone bad. There should
be a cable that runs from the transmission to the linkage on the
TBI(i'm assuming it is a TBI[Throttle Body Injection]) At the throttle
bracket, it is the lowest cable. It should have a little plastic box
and you should be able to push on the button and slide the little
plastic piece in or out of the box. This will adjust your shift points,
being plastic, the cable likes to slip if it gets old. Also if you have
book or have access to one it should tell you how to locate and check
it but usually you have to replace them once they start to slip, the
one I got for my 1992 was only like 28 dollars so it's not to bad just
a real pain.