Transmission issues summary

[JCL]

Originally Posted by TiAgX5

I would have gone with the ZF fluid had I researched the topic more throughly B4 my 100k fluid/filter swap. I was listening for trans noise post fluid swap for around a year (20k miles). Now that my trans has gone over 70k on Castrol I will be continuing with it to see if I can get to over 200k (no plan on selling the X, drilled slotted rotors/refinshed calipers/CC pads and KW C'overs are going on soon, sub-10k value on '03 4.4 is not enough $s for overall condition).

I think that is a very reasonable approach, to continue with the fluid that worked for you. My only caution would be that without a spec to conform to, any fluid is subject to changes from time to time and the fluid you buy one year may be different than what you buy a year later. Oil companies are pretty famous for changing their fluids in the interests of marketing, usually calling it reformulation. What the spec does is provide some comfort that there is a standardized fluid being offered.