HELP WITH GEARS FOR MY MEGA CAB

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HELP WITH GEARS FOR MY MEGA CAB - 5/16/2008 4:09:46 PM    DOGSRIDE Posts: 10 Joined: 10/16/2007 Status: offline I HAVE 35" TIRES WITH 373 GEARS AND I WANT TO UPGRADE THE GEARS. I WOULD LIKE TO BRING THE RATIO BACK TO STOCK SO THAT THE SDEEDO  & TRANS WORK PROPERLY. DOES ANYONE HAVE ANY INFO? _____________________________ 2006 MEGA CAB 3500 4X4 DIESEL 2008 MAGNUM SRT8 Post #: 1

RE: HELP WITH GEARS FOR MY MEGA CAB - 5/16/2008 4:33:54 PM    M15 Posts: 114 Joined: 11/18/2006 From: Temecula,CA. Status: offline The gears wont fix your speedometer you'll need a programmer for that. For gears 4.56s seem popular for your tire size and since you have a 3500 4x4 diesel you must have a steel driveshaft so no worries there. _____________________________ 2006 1500 QC SLT Big Horn 5.7L Hemi, K&N CAI Edelbrock headers custom Y-pipe Dynomax Ultraflow Catback Superchips Alpine head unit,speakers,subs and amps. Lucas synthetic oil. 65 Mustang coupe 289 V8,C4 trans 05 Yamaha Banshee (in reply to DOGSRIDE) Post #: 2

RE: HELP WITH GEARS FOR MY MEGA CAB - 5/16/2008 5:42:22 PM    DOGSRIDE Posts: 10 Joined: 10/16/2007 Status: offline DO YOU THINK IT WILL IMPROVE MPG _____________________________ 2006 MEGA CAB 3500 4X4 DIESEL 2008 MAGNUM SRT8 (in reply to M15) Post #: 3

RE: HELP WITH GEARS FOR MY MEGA CAB - 5/16/2008 6:09:22 PM    HammerZ71 DodgeForum Moderator Posts: 3039 Joined: 7/7/2007 Status: offline With the low end torque of your diesel, you don't need to change gears, you got all the grunt at lower rpm's you'll ever need.  This is why we in the "spark plug" crowd do the gears, to get the rpms's up at lower speed so we have some "umph" down low. The 3.73's are about the most optimum gearing you could have in a CTD for a balance of power and fuel efficiency. Don't change a thing... _____________________________ '04 QC Hemi 4x4 '02 Jeep Grand Cherokee Overland 4x4 '06 Can Am Outlander 4x4 No "Pavement Queen" here! (in reply to DOGSRIDE) Post #: 4

RE: HELP WITH GEARS FOR MY MEGA CAB - 5/17/2008 5:12:21 AM    DOGSRIDE Posts: 10 Joined: 10/16/2007 Status: offline but the trans is not shifting the same as it did stock . does anyone recommend a tuner for this fix? _____________________________ 2006 MEGA CAB 3500 4X4 DIESEL 2008 MAGNUM SRT8 (in reply to HammerZ71) Post #: 5

RE: HELP WITH GEARS FOR MY MEGA CAB - 5/17/2008 5:33:24 AM    HammerZ71 DodgeForum Moderator Posts: 3039 Joined: 7/7/2007 Status: offline I'm going to move this to the Cummins side, those guys will have infinately more knowledge of your issue as well as the best tuner advice for you... _____________________________ '04 QC Hemi 4x4 '02 Jeep Grand Cherokee Overland 4x4 '06 Can Am Outlander 4x4 No "Pavement Queen" here! (in reply to DOGSRIDE) Post #: 6

RE: HELP WITH GEARS FOR MY MEGA CAB - 5/17/2008 5:40:20 AM    cumminalong Posts: 2800 Joined: 7/12/2006 From: Swollen Beaver, OR Status: offline I've done umpteen posts on gears, ratios, calculations, etc. Do a search under my user name and gears and you will find a bunch of links to gearing. Going to 35's from stockers......4.10's would be the closest to stock.....but, going one gear size lower, especially in a 4x4 is a pricey deal. I usually tell guys that unless you are going to change gears by at least 2 sizes, don't bother. In this case, that would be 4.56's and with only 35's, those might be a bit too deep for the Cummins RPM range. If all you want to do is adjust speedo and get your trans to shift where you want it to and add a "little" bit of extra power....go and get a Superchips programmer. They aren't the most powerful, but they have all those options for you. Before you mess with the power options, get a set of gauges. Here's a few threads that contain some info I've given previously: This is a good one: http://www.dodgeforum.com/m_1303125/tm.htm Some good info here: http://www.dodgeforum.com/m_665609/tm.htm External Link: http://www.dirtroad.com/gears.htm Enjoy. < Message edited by cumminalong -- 5/17/2008 6:04:50 AM > (in reply to HammerZ71) Post #: 7

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