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Message: <blockquote data-quote="AuroraTom" data-source="post: 1386103" data-attributes="member: 90160">I spent the day playing with final drive(s) and remembered this post.I disassembled 2005 FJR and a 2008 RSV final drives.  I'm planning to put the RSV gears into the FJR pumpkin so I can have an overdrive gear in my 2004 FJR. (10:33 vs 9:33 ratios)Both of the final drive ring gear shims consisted of 2 piggy backed together.  The FJR had a .30 and a .50 together (.80 total) and the RSV had a .25 and a .40 (total .65)I don't think either of these final drives had ever been opened up so I guess the factory does regularly combine shims.  These final drives were both from junk yards (mileage unknown on both).When I checked the backlash both final drives were out of spec.  The 2005 FJR measured .022 and the 2008 Venture was .030.  My 2004 FJR measures .018 (upper end of spec) with approx. 60k miles.  I'm not going to mess with this one so I can easily go back to stock if I don't like the new ratio.Caution:  If you are increasing ring gear shims to decrease backlash the manual says to decrease the thrust washer thickness.  It would also be a good idea to check the stopper clearance because it will increase with an increase in ring gear shimming.  I'm not sure what the correct clearance is.  One of my POS manuals says .012 to .024 and the other says .010 to .020.  Probably not critical.  Also the stopper bolt is left hand thread (as is the pinion bearing retainer).Tom</blockquote>

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