The Mustang Forum for Track & Racing Enthusiasts

Taking your Mustang to an open track/HPDE event for the first time? Do you race competitively? This forum is for you! Log in to remove most ads.

  • Welcome to the Ford Mustang forum built for owners of the Mustang GT350, BOSS 302, GT500, and all other S550, S197, SN95, Fox Body and older Mustangs set up for open track days, road racing, and/or autocross. Join our forum, interact with others, share your build, and help us strengthen this community!

Time for a differential cooler?

I recently installed a Cortex catch can for the rear axle when I installed the Watts link with their cover. I figured I was now covered for any diff fluid leakage until I ran Watkins Glen last week. I typically do 20 min sessions but this event had 45 min sessions and I had fluid all over the axle area after each run. It appeared to come out the small breather filter at the top. There was only a small volume in the actual canister which seems to make the unit useless if it doesn't actually keep the fluid contained.

So I am thinking about a diff cooler. I saw the FTB and Kohr kits. Any other options that come ready to install? Where does the fan and cooler mount on the car? I wasn't expecting to need a cooler and shorter runs will likely not require it but I also don't want to have to keep cleaning up fluid.
 
723
334
I’ve installed the Cortex overflow on multiple cars, to include my own. They all overflowed as you described. They were replaced with a larger, trunk mounted Peterson overflow.

My opinion is if you are running longer than 25 minute sessions, you really should install a diff cooler.

Look in the how to section. There are several threads detailing differential cooler builds. The most common is a trunk mounted fan pack and pump. At least on is just a cooler mounted under the car with a trunk mounted pump.

You can build the Kohr kit yourself for less money. But, it is a good kit. One thing I would add is a Setrab in-line filter prior to the cooler.
 

Grant 302

basic and well known psychic
My opinion is if you are running longer than 25 minute sessions, you really should install a diff cooler.
This. 45 minutes is a loooong time for heat soak. If you're going to ever do that again, definitely install an auxiliary cooler and change your fluid regardless - since you boiled it!
 
You can build the Kohr kit yourself for less money. But, it is a good kit. One thing I would add is a Setrab in-line filter prior to the cooler.

I would rather spend the extra money and have a kit with everything needed to make it work so I don't screw it up. The FTB kit offers and inline filter and is less than $800 so I may end up with that. The trunk mounted option is also being considered as I don't normally do 45 min sessions. As much as I enjoyed it I also corded a pair of Conti slicks and used half a tank of fuel each run (6 runs total) so one day would have done it for me.
 

TMO Supporting Vendors

Latest posts

Buy TMO Apparel

Buy TMO Apparel
Top