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The 3-4 shift has been soggy for a while now. I didn't think anything of it. One night I got p0894 and had max line pressure during my shifts. I Checked the fluid and burnt my hand on the dip-stick. The fluid was still bright red and I couldn't detect any obvious slipping. I drove home in D.

A week later, I was on an open stretch of highway and was creeping up on 90MPH. 4th started slipping for 1-2 seconds and I immediately locked it into 3rd with the shifter.
Today: the fluid is still clean and doesn't smell too bad. No metal pieces.

Coincidence? I changed my thermostat because my engine was running too cool. Maybe the new and higher engine temps brought out an underlying problem? (They share the same radiator)

Main question: until I can get it repaired, how long can I drive it in third and what might be the problem?
 

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Are you SURE it's OD (which is really 4th) gear and NOT the TCC?

Test ---> do this...

Drive up to somewhere over 65 MPH and gently put your foot on the brake pedal to activate the rear brake lights but not enough to actually activate the brakes.

That way the BOO switch will also uncouple the TCC.

If/when your problem goes away or at that time shows up - report back.
 
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