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420A A/T overdrive issue

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John Jones

Probationary Member
1
0
Sep 25, 2018
Alba, Texas
My 99 gs is having problems with overdrive. With the o/d switch on it will get to 4th and slip to neutral then back down to second. With the o/d off, it goes through 1-3 no problem and then drops about 500 rpm into sort of a partial o/d mode. The cvi is reading 154 for 4th gear which is only 4 over, but I’m not sure where to start with fixing the problem. I changed both speed sensors with no change, so I’m thinking maybe the end clutch? Has anyone had these same troubles, or know what the problem may be? Any tips or opinions would be greatly appreciated
 

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