My old ZF 8HP70 stayed in the 195-199F range while my current ZF 8HP75 runs 168-172FThe ZF 8 speed is designed to run warmer just in case some are worried about high readings compared to previous vehicles, FYI.
At $30/quart, I’m not sure you’re getting your money’s worth here.I bought one, not really for cooling, but for the built-in drain plug. The cooling and additional fluid is just a bonus. I plan to do several drain and fills after swapping the PPE for the OEM to be sure that I get most of the old fluid out of the system. I would rather not drop the pan every time to do that.
Adding a drain plug is easy. There are a lot of inexpensive kits, probably around $10 or less. You just drill the hole, where you want it, and lock in the plug, with a couple of wrenches or pliers. These have been around for many years.I bought one, not really for cooling, but for the built-in drain plug. The cooling and additional fluid is just a bonus. I plan to do several drain and fills after swapping the PPE for the OEM to be sure that I get most of the old fluid out of the system. I would rather not drop the pan every time to do that.
Meh...to each his or her own. I actually bought a weld-in plug, but elected to go this route. I am good with my choice.Adding a drain plug is easy. There are a lot of inexpensive kits, probably around $10 or less. You just drill the hole, where you want it, and lock in the plug, with a couple of wrenches or pliers. These have been around for many years.
Here is a simple example:
https://www.amazon.com/Dorman-HELP-...hvlocphy=&hvtargid=pla-4584345016338692&psc=1
To make it even simpler, you could use a plug like that, and add a Fumoto Valve.
https://www.amazon.com/Fumoto-F103S-LC-10-Lever-Engine/dp/B07D9FCRWM/ref=sr_1_1_sspa?crid=1EG954Y886BD&keywords=fumoto+oil+drain+valve&qid=1646656189&sprefix=Fumoto+,aps,238&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExMDc3Q1Q5WVdPSzQ5JmVuY3J5cHRlZElkPUEwMTEwNDQ4MVQwVFBYNFU2N0ZQQiZlbmNyeXB0ZWRBZElkPUEwODQ3MDQzM0cyT1JNVjdSMTZTNSZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=
It is $15 a quart online and dropping the pan/changing the filter leaves as much in the transmission as you remove by dropping the pan. ZF does not recommend flushes so this is the next best thing.At $30/quart, I’m not sure you’re getting your money’s worth here.
I'll be changing mine at 50k miles and every 50k thereafter. At my current miles per year that's about every 4.5 to 5 years. I can get that ATF for about that $15 price from my dealer and the entire pan/gasket/filter combo is about $90 from them too, parts mgr gives me a dealIt is $15 a quart online and dropping the pan/changing the filter leaves as much in the transmission as you remove by dropping the pan. ZF does not recommend flushes so this is the next best thing.
Most will not change the fluid at all since FCA states that it is a "lifetime fill" but we all know that is bovine scatology. I just prefer to keep my JL well maintained.
You are correct, to each his own.Meh...to each his or her own. I actually bought a weld-in plug, but elected to go this route. I am good with my choice.