Model 2000 GMC shifting problem 4l80e transmission.
After i drive for about 15 miles and stop ,and start driving again the transmissio shift hardly in 1,2,3,4 so i do not know what to do ? i repelt the transmission ,i replase anew solnoid for 1,2 and 3,4 ,force motor ,tcc speed sensor , shift sensor help me please .
IYou say you rebuilt the transmission? The valve body is the touchy part. Are the ck balls in the proper positions?IYou say you rebuilt the transmission? The valve body is the touchy part. Are the ck balls in the proper positions?
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Depends in the mileage since the transmission was last serviced. It sounds like low pressure from the pump. It could be just a filter. You did not say where the leaking seal is, but a leaking seal will not fix itself.
did you replace transmission fluid and filter at every 30000 miles intervals.sounds like transmission low on fluid slipping or transmission filter could be clogged.
check trans codes, but i suspect it will have something to do with rear drive axle ratio, you will need to reprogram your computer most likely to the correct axle ratio...
There is a possibility the transmission is overheating, probably due to clogged cooling lines in the radiator. The transmission fluid is pumped through hoses to the radiator where it goes through cooling lines built into the radiator for this purpose. If the flow of transmission fluid through these lines is restricted, the transmission will overheat, and rough/hard shifting will result. Unless you are experienced at this sort of thing, I would recommend you take the car to a good shop to get this checked out. At the very least, you will have to have the radiator replaced. At worst, you might have to replace or rebuild the transmission.
Sounds like an issue when fluid gets hot, I'd start with a filter/fluid change.
I personally shy away from tranny additives, use only as a last resort to get a vehicle drivable to trade in (on a cash for clunkers program. (((SMILE))). )
1. Oil coming from the ext. vent means Overfill fluid transmission or valve body problem (need to open the transmission to overhaul it) but usually overfill.
2. Do you have any transmission faulty code
3. If you pull a trailer, heavy load there is a function in PCM (powertrain control Module) that raise the pressure to compensate the slip at clutch pressure and if you unhook the trailer and go on the highway before the PCM learn it, it will shift hard. What GM call the "shift adapt". You probably have a 4L80E for transmission or the 4L60E depends on the truck's options.
hope it helps.
A reason for hard shifting could be a problem with many things with various degrees of seriousness. It could be your ATF( automatic transmission fluid) is low or broken down and old. This would cause the hardness and the reason for stop and go traffic effecting it. Another possibility is your transmission is just shot, and the timing gears inside are worn and not properly shifting at the correct RPM causing a **** during shifting.
IYou say you rebuilt the transmission? The valve body is the touchy part. Are the ck balls in the proper positions?
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