aftermarket tranny coolers

[rustyruststang5]

i have a 1988 mustang with a moster aod trans. i added a after maket banm cooler to it. and i was woundering is there a sertan size line that should be used to maintain trans pressure. because my trans just acts weird. when i first take off in the morning it will slip really bad intill it warms up then it will start to shift normal. then if you drive for to long it will over heat and start to slip again. this is with normal driving aswell not hard driving. idk if the cooler is the problem or if its internal. i plan to tear into it when i get back. any advise would be help full. it also has a 3500 tci stall but it had this same problem b4 the stall.

 

[87AODGT]

I always say use the biggest cooler you can fit, if your trans is slipping it's definitely not because of the cooler it is because the trans is smoked and it's time for a rebuild

 

[HISSIN50]

Knowing trans temps would help you know if the existing cooler is big enough.

 

[rustyruststang5]

i was mainly talking about how big the lines are going into the cooler can they be to big? temps get up to 220 thats when it starts to slip. at 190-200 the trans acts normal