With my jdm s1 I was at 4500 rpm fifth gear at 75mph. The usdm 90-91 tranny was also labeled s1. Sounds like you might have been had. the gearing is ALOT different compared to an ls tranny.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.