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they are supposed to downshift if the load gets too great , like climbing a hill and they do not have to be big hills . a lot depends on the load being carried .5 large adults works a vehicle harder than 1 adult and 5 children
Most modern automatic transmissions have a chip in them that will prevent the car from downshifting, say, into first gear when you're moving at 60 mph. Still, I wouldn't try it. When climbing a hill, only downshift if the AT can't decide which gear to be in and switches back and forth--choose the lower one. When descending use brakes to decelerate. However, once you've braked, do use a low gear to coast in, to prevent you from freely accelerating down the hill. ------------------------------------------------------------------------------ GM Tech2 GM Diagnostic Scanner With C card
When you say going up a hill are you wide open throttle? Does the bucking occurs at 5300 RPM? If you are you have reached the fuel shut off limits before the transmission can shift,This happen if there is a high demand on the alternator, The solution for this is a redesign of the govenor pressure sensor on the transmission.But before you even decide this is a solution make sure the throttle valve cable is properly adjusted,(this is the downshift cable)
This is a common feature on many cars. If you press the brake on the way down the hill, the transmission will downshift and keep RPMs high in order to prevent your speed from increasing too much. If this bothers you, you can simply shift into neutral and brake manually. The only other option is to coast freely down the hill without brakes. No brakes = no downshift = no high RPMs.
This vehicle had a problem with the valve bodies in the transmission. There are several servos that assist the transmission to shift. This problem is best diagnosed by a local trans shop that can do an OBDII test to see if the trans has the proper voltages to the servos as well as to check the pressure.
Hi, two possible issues here. the first could be a malfunctioning shift solenoid. this can affect the shifting operation. the next issue could be the transmission control model(TCM). if this fails, you will experience abnormal shifting during up and downshifting. I would check these areas as well as the fluid level as well. Some transmissions are sealed and you cant check the fluid level. if you have a transmission dip stick visible, please check the fluid level before you check the other areas.