02-12-2011, 12:01 PM
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#3
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Turbo Member
Join Date: Feb 2011
Location: Virginia/Philippines
Name: PI_greg
Posts: 1,370
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That is a old school chart as stated it's calculations are for 1:1 top gear. Our transmissions have two overdrives with the final gear ratio a .67. So a little math is needed to accurately use the chart. But the basic rule of thumb has been stated to be 33" and taller tire use 4:56. Smaller than 33" use 4:10. If you tow a heavy trailer use 4:56. If you have 3:92 gear and you want more gear go to 4:56. I personally run 30" tires and choose 4:10's and wish I'd gone with 4:56. The Chrysler engineers clearly got their gear strategy wrong. I have never heard of anyone say they didn't like the gear change when done. I believe it is clearly recognized as one of the best mods for our trucks we can do, good luck...
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PI_greg 2003 SXT-Hemi, SS/T rims, 275/60-17, AeroForce, w/wideband, 6.1 ignition, K&N-77 CAI, Fastman TB, eFan, 180 stat, TMR, HD OEM Trans Cooler, SC3865/PSC1, Dual window switch/ high idle mod, Edge, Crazy Spartan (112 lsa), 2800, DTT 4:10, TCI Floor Shifter, Shift lite, Pacesetter Ceramic LT's, Magna Spun Cats/SI/DO Muffler, Mcgaughys 2/4.5 spindle kit, Monroe shocks, Caltracs, Aeon springs bumps, SRT-10 gage pillar, air horn
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"Ram It"
2003 Dodge Ram 2500
Linear Mode
