Tranny Problem NEED HELP!
1k miles ago i put in a cooler and the B&M tranny deep pan the cast alum. one and today i did like 120 miles on it today around town and right before i got home i wouldnt do into 4th, if i put it in 3rd then Drive then it would shift to 4th then after like 5 sec back into 3rd and when it would go into 4th when i went to accelerate then it would slip like crazy but when i put it in 3rd manualy then it would be fine.. whats can this be.. fluid is full and clean please help thanks

