Transmission Diagnosis and solutions. Probs at higher gears

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Old 30 Jun 2011, 10:52 pm   #1 (permalink)
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Default Transmission Diagnosis and solutions. Probs at higher gears

1998 Lexus GS 300 172,000 miles.

Shifting from Park, Reverse, Neutral, Drive are all ok. There are no check engine or Ect warning lights on the dash. I use Toyota ATF 4 and change out2 quarts w/ every oil change at 4,000 intervals.

I can up and down shift the lower gears w/o issue.

The problem is when driving in the higher gears at 40 mph or higher. I'll let off of the gas and when I return to step on the gas pedal again, the engine will rev but I won't get a response from the transmission. I'll have tolet off and rev a few times and the transmission seems to slip/drop clumsily back into gear. Heat is a factor as this happens more frequently on 105 degree days (Las Vegas)

I can't be convinced that this is normal behavior. It never did it before and now it is doing it more and more frequently.

1. What is causing this?

2. How hard is it to change out a transmission entirely? I know the cost is$3500 for the rebuilt transmission but I see them commonly at $1500 or less on eBay?

3. Tonight or tomorrow I will look at the Transmission pan. Is there anything special I should inspect once I have that opened up?

Thanks all
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