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Sam the A/T trans in all cars is the most complex of all
I know it seems simple until it breaks.
or until actual fix one.
tell us with the trans does good and bad in ALL GEARS
slips or flairs
will not up shift to gear ? name gear
will not down shift, same.
noises odd. or vibrations.
will no move. car at all
get it serviced
check level using operator guide method do not guess.
scan it yet
Have it checked with a code reader. You have a dead cylinder. The code reader will tell you which cylinder it id. That cylinder needs a fuel injector change. Symptom being, when start moving and normal throttle, shifts thru the gears fine with no loss of power. As soon as it goes into Overdrive, it feels like the whole car is going to vibrate off its chassis. That thumping is what we call a dead cylinder. Because it is just that, dead. Yet when you push the pedal down, it will downshift and run fine. Change the injector.
Sounds like your transmission or lockup converter is slipping. The slipping causes heat and it is downshifting out of overdrive as a built-in protection strategy. Get the transmission looked at ASAP before you get stranded because it's stuck in a downward spiral right now. The problem could be caused by a stuck solenoid, which is a relatively cheap fix, but the more you drive it like this, the more you're working toward a full, expensive rebuild.
check to make sure you have no vacuum leaks. u can use a cheap can of carburator cleaner and spray around the vacuum lines of the truck, if your truck starts idling up and changing, you have a leak then just replace the line. Older GM vehicles rely on Vacuum advances for the transmission and will not shift properly nor downshift if there is a leak. a lot of vehicles rely on vacuum to support many functions, mainly driveability as well as smooth running. there should be a vacuum line that runs near the rear of the transmission. also might want to check transmission fluid for the no power, cause even though you may have power in 1st and 2nd, 3rd gear is your main drive gear unless you have a 700R4 with automatic overdrive and it could be suffering from not enough fluid getting to the bands from the pump. also one more thing, check the downshift linkage cable the runs from the carburator to the transmission, make sure it is working, sometimes you can have a broken cable in the line and not even know it. hope this helps
u need a scan using factory or vehicle specific gear--values of components will be diplayd so an xperiencd tech can decyfr--littl code readers dont du it---w age of car certain sensors etc need replacin-believe that trans is electric controled--dont rplace any parts til uve isolated issue----------also go to magicmechanic online and checout the napa library on that model
The short answer, yes. M46 models with the type J or P overdrive (depending on year and market) require a certain level of oil in the overdrive. Additionally, the overdrive is a lot like a standard automatic transmission with one gear range in theory of operation. Therefore, the hydraulic properties of said transmission do come into play here, line pressure, shifting pressure, accumulator and piston function all work together to engage or disengage the unit. Always ensure the unit is disengaged before downshifting and of course, shifting into low reverse.
First off there may be nothing wrong. At highway speed, the trans will shift down to 1st, but you won't feel it. If should feel like neutral. Does it shift normally when your "wide open throttle" from standstill? If it shifts properly in this situation, then your fine, don't worry. How about wide open throttle at say 25mph? how about 35 and 45? anything over that and its gonna feel like neutral. IF your convinced that your passing gear is not working right, it could mean that its out of adjustment, and needs a little more push, more throw, or kinda like adjusting the rod out a little bit further. Adjust your "passing gear linkage" or kickdown as you imply. Second guess would be low on transmisison fluid, filter, and last, the transmissoin control selonoid. Again I suggest its doing just fine, if it shifts down at any speed.