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No Reverse


John2005

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My wife's 94 Deville will not always move when reverse is sellected and when it does it dosn't move far. The car has been parked on an incline reguarly and when reverse is sellected there has been a problem getting the shift lever to go into reverse. When reverse is selected the engine seems to load down as rpm decreases but usually no movement. Please Help if you can.

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When parked on a level surface, does shifting into reverse/accelerating exhibit the same problem? Are you using the parking brake when parked on the incline? Is it engaging fully? Have you tried engaging the parking brake on the incline before there is enough time for the car to lurch forward or backwards on the incline in park? (put it in park, do not release normal power brakes, use other foot to engage parking brake, release power brakes) Is the parking brake fully releasing?

Have you taken a look at the transmission fluid? I assume its clean and full?

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John,

Which engine does your wife's Deville have. If it has the 4.9 it will have a 4T60E transmission. If it has the N* it will have the 4T80E transmission..

The book for the 4T80E list 16 different causes for no reverse.

The 4T60E lists 11 causes.

If the A & B solenoids were changed recently (on the 4T80E) there is a change that the LO/REVERSE band is disengaged. Try putting the trans in 1st gear manually and see if it will move forward. (A real shot in the dark). If so, then the valve body will have to be dropped and LO/REVERSE band repositioned.

Hopefully it is something simple.

Good Luck,

Britt

Britt
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John,

How much of an incline are we talking about? It would have to be pretty steep to uncover the fluid pick-ups in the pan. Does the reverse work normally when the car isn't on an incline? How about the fluid level? Put the car on a level surface and check the fluid level with the engine running and warm. The combination of low fluid and a steep incline may combine to cause your reverse problem.

Additionally, on an incline you should apply the parking brake BEFORE you place the transmission in park. Then relax the foot brake to let the parking brake take the weight, THEN place the transmission in neutral for a second (to relieve built up torque) and then into park. Before moving after engine start, always take the transmission out of park (foot on brake) before releasing the parking brake. This should make the shifting out of park MUCH easier.

The fact that you have used the park feature of the transmission on an incline may indeed cause damage to the parking pawl, but it shouldn't have had any direct affect on the reverse in the transmission.

Britt

Britt
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The incline is about 40 degrees. I pulled the car to level ground and the problem is the same. Sometimes reverse engages and works ok. Sometimes reverse engages and the car moves about 6 feet then stops as if you put it in Park. Most of the time the engine sounds like reverse is engaged but the car dosn't move as a matter of fact it seems as if it's still in park. Thanks

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Do you get any movement at all in reverse? Does it feel like its trying or just slipping? The reason I say this is maybe the parking pawl is stuck on even though it goes into reverse, I am not sure if that is possible, to have the pawl ON and the car in reverse unless something broke. This could possibly be caused by the inclined parking and forcing it out of park because the parking brake was not use, the full weight of the car is on the pawl. Mike

Early on sailors navigated by the stars at night and the North star became the symbol for finding ones way home. Once you know where the Northstar is you can point your ship in the right direction to get home. So the star became a symbol for finding ones way home or more symbolically even finding ones path in life.

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The transmission dosn't feel like is is slipping and there are no trouble codes. Thanks.

what does it feel like, does it try to backup, does it feel like something is holding the car in place? If it is not moving and the RPM is rising the tranny is slipping... Is it slipping?

Early on sailors navigated by the stars at night and the North star became the symbol for finding ones way home. Once you know where the Northstar is you can point your ship in the right direction to get home. So the star became a symbol for finding ones way home or more symbolically even finding ones path in life.

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