Any advice on how to do that?
call Patricks - Telephone
(520) 836-1117 (8 a.m. to 4 p.m. Monday-Friday/MST).
I bought a 3:38 set up from them. They did everything they said they'd do, were good to deal with, and shipped in a timely manner.
I went from about 3500 RPM to around 2800 at 70mph . Well worth the dough for me.