Summer 2020 I installed a 2004R (Extreme Automatics Stage 2). I stayed with the original 3:23 gears, and have 27 inch tires. Works perfect for me and highway driving is a dream compared with the TH400. I am sure a 3.42 or 3.55 would be fine too, but I stayed with the original rear for convenience (and money towards other tweaks). Should I toast the 3.23 down the road, there is a good chance I will stay with the same ratio.
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