ok well the tranny thats in my car ive had for about 5k miles now and about
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

 

Check your computer for engine or trans codes and then get back to us.

 

i hooked it up no codes all i got is an 02 sensro code and thats it