Auto tranny pops out of drive when going around corners

[pimpin81]

After doing a tranny service chaned the filter and oil now the tranny slips out of gear when going around corners . Fluid level looks good. What is going on it didn't do this at all before the service I used ATF+4 about 3.5 quarts were put back in after filter and pan were bolted back up.

 

[wrencher]

Either it's low on fluid or the seal on the filter is not working.

 

[pimpin81]

Put a little more fluid in it half a quart over what the manual says for a drain and refill but the manual also says quantities may very

Anyways it's fine now.