<html><head></head><body><div class="yahoo-style-wrap" style="font-family:arial;font-size:16px;"><div dir="ltr" data-setdir="false">Hello all,</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">I have a 1957 Chevrolet 3100 pickup. It currently has an open rear end and I believe the gears are 390 or the same as the sedan. I am wondering about replacing the center section with a posi unit and was wondering if a 8.5 would work?</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Thanks,</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Jim W.<br></div></div></body></html>