Transmission Fluid Built 700R4

[brandoLSX]

I am currently building my 700r4 from a Pro-Street build kit from Pro-Built Automatics. They recommend some Liquid Engineering product. They don't really sell this in stores and it has been a hassle to try to get ahold of a representative from the company to sell it to me. I don't want to go through this hassle every time I need a quart or two of oil. Is there any recommendations for transmission fluid for a built trans? As far as a newly built transmission is there a break-in period like engines where you shouldn't use synthetic for the first 500 miles or is this just a myth? Something that I can pick up at a auto parts store or something more readily available would be nice. Please let me know your thoughts. Thanks

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[DynaSlim]

Weird. Regular break in fluid would do. Then change after break in like 100 miles. Don't forget the filter. Use regular oil.

 

[brandoLSX]

Heard Royal Purple Max ATF is the way to go, any experience??