So I was looking online at transmission coolers and noticed that they have really big ones and small ones. Now I got a stock one out of a grand Cherokee at the pick n pull for I think 10$. Now if I got 2 or even 3 of them and hosed them all together on the jeep would that work?

 

No. That is exreme over kill and you need some form of warm trans fluid to make your trans happy. If you run 3 external coolers it most certainly will not even get slightly warm! Stick with an OEM cooler or slightly bigger. The aW4 trans is meant to operate at 210 degrees....keep that in mind

 

Ok i was just curious cause I got a stock one and I see tons of them around and I see the big ones. I guess If I plan on doing it I should get a trans in and out temp gauge to really see if it would be bad or not.

 

I don't think any auto tranny was designed to operate at 210.....that's why the factory cooler is located in the colder tank of the radiator. If the cold tank is 210, how hot is the hot tank?

One auxiliary cooler should be sufficient. More coolers increase chance of excessive pressure drop. There are some really good JY finds....my opinion is that used tranny coolers are NOT a good find. Who knows what kind of scale/build-up is coating the internals and can the crud be thoroughly cleaned out? Will the crud sluff off and enter your tranny.

 

This one had trans fluid leaking out still and I am probably going to spray water inside to flush out as much stuff if any is in it.

 

If you get a small size cooler for a good price, $10 was a great deal, and you can get a second, yes I would run the pair. You can flush and blow thru with air also. Use excellent qualtiy hose and clamps and don't let the hose kink at installation. Your trans will appreciate the cooling.

 

Will water cut thru/remove any hardened scaly crud inside a used cooler?....can u be positive all the water has been removed?

 

Not really I'm pretty sure it's going to work better than not having it.

 

Auto zone sells a cooler 30 bucks plenty of cooling this is the same one i have http://www.autozone.com/autozone/par...7926_2695_2735

 

Ya I see that but I dont have much Money so any time I can go for the cheap stuff I will

 

Bingo.....X2, 10 bucks questionable used vs 30 bucks new/clean???????

 

Or 10$ + a zj v8 tie rod and boots for 30$

 

125-176*F. 210 is killer

 

Go back to the JY & get the ZJ temp gauge/sending unit and splice it into the hot tranny fluid line. Hopefully u'll never see anywhere close to 210 tranny temps.

 

My Trans Am has a cooler the size of the radiator.... just saying.. Do what you want but cooler is always better. If you want the trans fluid warmer, simply don't bypass the radiator cooler and it will act as a fluid warmer