Hello good people. Pls I have serious issue with my Toyota sienna 2004 model gearbox. I replaced my 10 pin gearbox. When I engage drive, it shift from 1st to 2nd gear well. But shifting from 2nd gear to 3rd gear shakes the car and makes whining noise. From 3rd to 4th gear is fine. Then downshifting from 3rd to 2nd gear make so much noise that the gear slips, then jumps to 2nd gear and then back to 3rs gear. So it makes it difficult for me to overtake another vehicle. I took it back to automatic transmission repairer who replace the body vale and same thing continues. Auto electrician scanned it and the following codes were shown. P0798, p0986 and p2770. The auto electrician doesn't know how to fix it and the transmission repairer said it is not his work. Please anybody who knows how to fix the problem should help me. I have browsed the net but I don't understand the solutions they are giving me there. What should I do? 2nd to 3rs gear and 3rd to 2nd gear is the issue here. Thanks for your concerns

Milosval:
Hello good people. Pls I have serious issue with my Toyota sienna 2004 model gearbox. I replaced my 10 pin gearbox. When I engage drive, it shift from 1st to 2nd gear well. But shifting from 2nd gear to 3rd gear shakes the car and makes whining noise. From 3rd to 4th gear is fine. Then downshifting from 3rd to 2nd gear make so much noise that the gear slips, then jumps to 2nd gear and then back to 3rs gear. So it makes it difficult for me to overtake another vehicle. I took it back to automatic transmission repairer who replace the body vale and same thing continues. Auto electrician scanned it and the following codes were shown. P0798, p0986 and p2770. The auto electrician doesn't know how to fix it and the transmission repairer said it is not his work. Please anybody who knows how to fix the problem should help me. I have browsed the net but I don't understand the solutions they are giving me there. What should I do? 2nd to 3rs gear and 3rd to 2nd gear is the issue here. Thanks for your concerns

First of all, your vehicle came installed with a 5 speed 13-pin gearbox. What you have experienced is the classical symptoms of a 4 speed 10-pin conversion and the only solution is to return the vehicle to factory specs.

aieromon:


First of all, your vehicle came installed with a 5 speed 13-pin gearbox. What you have experienced is the classical symptoms of a 4 speed 10-pin conversion and the only solution is to return the vehicle to factory specs.

That should be the starting point. I agree with your comment

aieromon:


First of all, your vehicle came installed with a 5 speed 13-pin gearbox. What you have experienced is the classical symptoms of a 4 speed 10-pin conversion and the only solution is to return the vehicle to factory specs.

I have been using 10 pin gearbox. I only replaced the 10 pin gearbox with another 10 pin gearbox.

Those fault codes are Standard. The effect you get is dependent on how the 10pin conversion was done.

OPUSDEI1:
Those fault codes are Standard. The effect you get is dependent on how the 10pin conversion was done.

Please what do you mean by saying that the fault code is standard? Does it mean that conversion to 10 pin automatically gives out those codes? Pls I need answer. Thanks

Milosval:

Please what do you mean by saying that the fault code is standard? Does it mean that conversion to 10 pin automatically gives out those codes? Pls I need answer. Thanks

In 99% of the cases I have come across, Yes.

Was there any solution to this or did you finally change back to 13pin?

tosburg3:
Was there any solution to this or did you finally change back to 13pin?

That is the only solution