Overdrive Problem??? Whilw driving on highway at cruising speed!

[jmccawley96]

:withstupid:I have a 94 sr5 4x4 auto and while driving down the highway it shifts from od to 3rd runs in 3rd for a mile or so then back into overdrive. The shifts are smooth just acts like its shifting into 3rd like your going up a hill but its a flat highway. does this shifting out of OD every few min or so. any ideas???

 

[4runnerBrett]

Would guess it has to do with cooling. If your temp goes down then no over drive so try replacing thermostat and see if that helps.

 

[jmccawley96]

I was thinking cooling also. It sure does take along time to get to operating temp. I will try that out thanks