Problem with 2000 Grand Jeep Cherokee Limited?

Question:
93,000 miles
Engine size is 4.7L 8 cyl
4WD all the time
Problem is when it reaches a speed of about 40 to 45 miles an hour while pressing the accelerator it makes a knocking noise. I took it to get it tested and I would like someone else opinion. I am taking it to a different shop tomorrow but in the mean time..they drove it and hooked it to a machine and said it had torqe converter failure and it showed an error on the gear ratio. They told me it's gonna cost $429 JUST to take out the transmission and look to see exactly what is wrong but it could be a number of things once they get inside the transmission. Anyone heard of this before? I have never had to take a vehicle to the shop so I don't know what to expect. Thanks.

Answers:

What can i do?

It could be the torque converter lock up solenoid. They are an electrical piece, and probably about right on the price. Which is unfortunate. Hope your second opinion gets you more to look into.

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1999 Chevrolet Camaro Upgrades?

could be bad CV joint.try another place befor letting the 429 guy rip it apart.may be lockup converter...if it is get check book warmed up.1400 to 2000 dollars. is the knock like a jerking in and out...

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I have a 2006 Chevrolet Equinox. All of a sudden it did not want to start? Is there a current recall on them?

do you REALLY off road!
http://www.greenparty.org/

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