Re: NO REVERSE FORWARD GEARS WORK. IS THERE A BAND...
I have a 2000 Honda Accord EX, it shifts normal on forward with no problem. Also when the car is cold the reverse gear works just fine, but when the car runs for about few minutes the reverse gear will not work. It will seem as if it wants to go but then if feels like its neutral.
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If your transmission is a 700r4 (4l60) you have a reverse band that engages when you want to go in reverse. since it drives forward your low reverse clutch and your fwd clutch are working. This leaves the band which was probably slipping now is not engaging.
.One of the most common causes of a slipping transmission is a low automatic transmission fluid level, also a dirty and/or clogged automatic transmission filter can impede the normal flow of automatic transmission fluid throughout an automatic transmission and cause the transmission to slip. Adequate, unobstructed transmission fluid flow is necessary for the optimal operation and function of an automatic transmission, including the function of the transmission bands and gears, two transmission components that routinely cause transmission slippage.Another cause would be faulty torque converter action and maladjusted transmission band.
Transmissions have a series of clutch plates, friction plates,bands,gears and solenoids located inside the transmission. As the vehicle moves forward, these plates operate similar to a clutch on a manual transmission, but using fluid pressure and momentum to do so. Usually these go bad due to lack of proper service intervals. If the fluid is not changed at recommended intervals, it breaks down, similar to engine oil,and causes the transmission to get hot and burn up these clutch plates and bands. Therefore you will get certain gears that will fail to engage. In your case, the reverse.
It sounds like the reverse band broke. Typically with automatic transmission when you put the transmission in reverse a couple things happen. Usually, the forward clutch engages and the reverse band engages holding the reverse drum from turning, which causes the planetery gears to make the vehicle move backwards. If the band breaks there is nothing told hold that drum from turning and you have a forward gear. The bad news is the trany is going to have to come out to be repaired and usually the reverse drum is one of the first things to go into the trany, so it has to be completely disassembled. Take it to a transmission shop have them check it, hopefully it's something simpler.
I believe that reverse is operated by a brake band. So it seems to be stuck. It is operated by a piston, and the seal could have swelled and caused too much friction. But you could loosen up the adjustor so that it is disengaged, in order to get forward gears again. Perhaps you can force the piston to retract as well, once you drop the pan again.