Koyo does make a radiator for the 5AT. I have one on my 2006 5AT coupe. The part number is A2588.

http://www.koyorad.com/search.asp

The part number for the 6MT radiator is V2588.

The AT radiator has transmission cooler lines that run through the radiator. If you buy a radiator design for a MT, it will not have the fittings for this.

 

THANK YOU SO MUCH!!! So do i still need transmission cooler if i get this one made for the 5AT? just clarifying...

is this the polished one?

and what fan shrouds am i able to use?

 

You will not need an external transmission cooler since the AT cooler lines hook up to the radiator. From my understanding (by reading here on Driver) is that the guys that get external transmission coolers is because they need to keep the temps down especially if they are boosted or tracking the car. I imagine even an aftermarket radiator can only do so much.

It's the OEM replacement.

 

does it matter what brand or type?

as for the fan shroud does that matter as well?

 

i looked it up and the top and bottoms of the radiator is black... they're like $180??

 

im not racing it or have boost... just wanted the upgrade and polished look of the radiator... so IYO do i need the transmission cooler??

 

You don't need it.

 

Thank you for all of your help Lone Wolf.

 

Yep, this is the regular Koyo (not "racing" model) so it's not all aluminum. The top and bottom are plastic like the OEM radiator. I would get an all aluminum if I were you...

 

I pretty much need to... Any suggestions on which one? Shoot me a suggestion for fan, radiator and trans cooler.

 

You should consider getting a transmission cooler - the stock cooler is not sufficient for many applications IMO.

The number 1 cause for failure in automatic transmissions is HEAT. Our stock cooler regulates the trans temp fluid w/ the engine coolant. The coolest it ever will get is the temp inside the radiator.

I have been running a B&M cooler in series w/ the oem cooler inside the trans for a while. In my opinion all stock auto trans need better coolers 90% of the time. This of course is dependent on driving style and climate as well, but the in-radiator coolers do not help much.

 

honestly I'm not sure why everyone says you have to get a trans cooler. I'm boosted 5AT making around 400whp and I've been monitoring my trans temps with a gauge and it never gets over 200 F. Now, I also have the nismo thermostat, and I run distilled and water wetter instead of normal 50/50 AF.

I live in Texas and temps here are usually over 100 consistently during the summer. One thing I do recommend, boosted or not, is an oil cooler. When I was NA I put in a gauge to monitor temps and they were consistently over 240F. I have since installed a 19 row cooler with -10 AN lines and temps now don't reach over 210F. 240F NA no Oil Cooler to 210F Boosted with the oil cooler. I damn near doubled my power and my temps still dropped.

 

i see the Koyo is goin for about $310-$320 on ebay. Anybody have any luck getting lower pricing from any of the forum vendors?

 

Trans cooler will be my next investment since I went into limp mode this last summer due to the fluid getting hot. Like the polished B&M unit with the largest capacity. When I replace my radiator I sure don't want one with the plastic side tanks like OE....why bother?
Gary

 

I picked up a Mishimoto radiator - I'll post my findings after I install it.