Trans cooler

Did all second gens come with a trans cooler? The little on in front? Wanted to upgrade mine but I guess he ran away… or I’m Challenged…
I wanted the mishimoto one but will that not work if I don’t have a trans cooler from the factory?

 

All 2nd gens have a trans cooler/heater internal to the radiator. Only 2nd gens with the tow package have the additional external cooler.

You can install an aftermarket cooler on both (and typically people with the tow package ditch the external one when adding the aftermarket cooler). Generally you would want to route the circuit as follows: Trans > internal cooler/heater > external cooler > trans return.

I have the

$59 Hayden Automotive 679 Universal 11” Rapid-Cool Add-On Transmission Cooler to Enhance Cooling (not for direct replacement of the factory unit)

Hayden Automotive 679 on mine.

 

Got it, I’ll look for some diagrams from people who have done it. The mishimoto one is designed to replace the tow package cooler. Can I use that one or do I need a special kit? Maybe I’m over thinking it and it’s pretty simple

 

If i was to swap my stock aux cooler or add in an aux cooler on a rig that didnt have one, absolutely the hayden Internal By pass cooler. PN's 696 or 697 or 698 depending on how much cooling you wanted.

https://www.haydenauto.com/media/9055/bypass-transmission-oil-cooler_flyer_2022.pdf

 

Hypothetically say I lied to y’all, and already bought the mishimoto cooler a week ago…
It looks like I can just use the tubing, and just add it in like a circuit. Trans-> radiator-> cooler->trans. But do I need more tubing than it comes with because it assumes I already have the tow package. It comes with brackets so I am good in that department.

 

Haha that works. Just note that if you dont have something like the internal bypass cooler with a built in thermostat or an inline thermostat you can actually OVERCOOL the transmission fluid if you live in a cooler climate.

 

As far as I know it doesn’t have that. But what I do have is a scan gauge 3 and eyes . What’s a good temp range? When I’m just driving around town will this be too much you think? I guess I could return it and get a bypass system.

 

If you do need extra hose, you can buy bulk hose online or at an auto part store. Just look for automatic transmission fluid hose; typically it will be nylon braided nitrile rubber hose.

I believe the correct size is 5/16" ID (or for our trucks, 8mm ID, but 5/16" is easier to find and almost exactly the same size at 7.9375mm), but I would measure yourself to be sure.

The 165-175 range is generally considered ideal.

 

The A750 transmission docs call out a normal operating temp of 68F-230F - these numbers from Aisin, not Toyota, and are engineering data that doesn't reflect the application. Note that on the high end, this is cooking the hell out of your ATF, cutting service life drastically - more than 50% reduction IIRC from the heat decomposition tables for WS ATF. Toyota says normal temp range in the Taco is 122F-175F.