I have bought transmissions from both Brewers(Dan & Wayne) and Passon(Jamie)...
Both places are top-notch and provide incredible support for our Mopar 4-speeds.
1 thing I like about Passon is that they can supply an
almost completly new 4-speed, as they have tooled their own set of
new overdrive gears for the 18-spline transmssions..
In my older senior years when I replaced the A-833 in my RoadRunner I wanted new gears, as the rebuilts supplied by Brewers and Passon use reconditioned gears from older cores.
Even though I reside in SoCal, 1 dealt with Jamie @Passon, he responded promptly and shipped me an
almost completely new transmssion with overdrive gears.
Installed it and now several 000 miles later all is well.
Just my $0.02...