Murfman, you are really going to love the Gear Vendors OD. Especially if you tow a large trailer.
Sorry I can't help you on the Transmission questions, but I am sure someone will.
Walt
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91 D350,New style BD Brake,Gear Vendors O/U Drive,Gauges-Pyro,boost,tach,trans,rearend,brake,
Airbag rear,Transfer flow tool/tank, Exh. sys,Rino lined bed, Alcoa Mags,SS runningboards.
16cm.