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Ls400 Auto Tranny Problem


rob123

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Hello, perhaps somebody can help or knows something.

I have a problem with my 1999 LS400 (100.000miles).

My auto transmission isn't able to shift up from 4th to 5th gear anymore. My car is out of warranty and my dealer quoted me 3500$

I can feel that the transmission wants to shift into 5th. But it does not.

Urgent advise needed. Is this a known problem?

thanx

rob123

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Welcome dude... sorry to hear it.

Still, what have you tried to do about it? What did the dealer say was wrong with it? When was the last time you changed the fluid? Checked the fluid?

Answers to those might help us help you better.

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the dealer said only that the transmission must be changed completly. the oil ist changed just 4 weeks ago. nothing more. another member said that the transmission must be reseted. do you know something about it.

greets

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there are only 4 gears in the ls tranny not including reverse...

so you are prolly talkin about 3rd and 4th gears

there are lots of different reasons why it might be doin so, one of them are the converter locup and another one is electrical problem

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If the transmission works fine, except for the 4th – 5th shift, I would suggest that it is an ‘electrical’ problem. There is a number of sensors – solenoids – control unit – that controls how and when the transmission shifts.

The dealer should be able to tell you exactly what’s wrong with your transmission by running the diagnostics on your car.

Let us know the details.

Regardless of the response from the dealer, get a second opinion. At $3,500.- it’s worth the effort.

If all the electrical checks out fine and IT IS a ‘mechanical’ problem with the transmission, I would start experimenting with the ‘transmission fix’ products from Lucas Oil. At that point, you have nothing to loose and quit a few have had great success with this product.

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