Yeah thats my dilemma too, when its cold it will run through every gear in and out including 4 th . But if you drive it about 20 or 30 minutes in 4th it wont come out ! Old shifter was kinda sloppy , but shifting before rebuild , so just decided to go ahead and change out with another one , same thing ! I have had several of these and checked the linkage, nothing obviously wrong . And i was thinking if it was in the linkage it wouldnt shift hot or cold .
One side note , linkage on 3-4 rod can be taken off and trans can be taken out of 4 th gear .
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