External Transmission cooler?

[V8 00USH]

Originally Posted by bcredliner

I just don't get messing with a transmission cooling system when one is not a trained ZF technician and there is not historical data that indicates overheating has been a problem certainly not a chronic issue.

I understand trans coolers are used in some applications but that doesn't mean it is good practice on other brand vehicles, as much chance it is a bad idea as a good one. In the discussion, comments bounce around different transmissions so there is no consistency of input to even a given transmission.

Explain to me why it is not good practice? Why should one need to be a trained ZF technician to understand that keeping the transmission fluid in a more optimum temperature range will help extend the life of the transmission, help to keep it operating efficiently and help extend the life of the fluid? Running transmission fluid at over 100 degrees (yes I have proof) isn't going to help anything. Everyone is aware they are a particularly fragile transmission especially when approaching 100k and over - could this be the reason why?

There is also no risk over overcooling since the thermostat is in place to avoid this.

Before I added this transmission cooler I had 3 issues...

1. Harsh 2-1 Downshift
2. Getting stuck in 3rd gear
3. Randomly changing down gears

I have now done 20,000 miles in it since fitting the cooler (half of which have been done whilst towing) and I have had NO further issues at all. To me that's a result and worth every penny.

Originally Posted by semcoinc

Do you (or anyone else) have any pictures showing the exact factory cooler line to tap into as the return line for external cooler fitment?

One other question, did your -8AN push on fittings fit directly into the ID of the OE return line?

I believe I tapped into the line labelled 1. on realoem.com. I will double check tonight though when I get home.

Yes, the fittings did push directly in - do yourself a favour when you fit them and take the lines off the car completely. It's the only way you are able to get enough purchase on them to ensure the fitting goes all the way in as they are very very tight. You cannot do it on the car you just don't have the space or the capability of being able to hold them whilst you do it. If the fittings don't go in properly they will absolutely without a shadow of a doubt come off once the car is running......trust me on this I know and fluid isnt cheap when you lose a load.