Axle Ratios

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Question,
I am always reading about axle ratios and don't understand EXACTLY what they stand for, any help (I know a 4. 10 is lower than a 3. 54)?

Also I'm always reading about 4. 10's and 3. 54's... ..... Am I the only guy with a 3. 55?

Thanks,
Ron
'99 quad cab long bed 4x4 bought used with 20k on it...

 

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Just went outside and looked mine says 3. 5 and leaves out the next digit. Maybe it has something to do with auto and manual transmissions.

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92 Dodge LE, Cummins, reg cab,4X4,3:54 gears, Auto, Black/w Maroon Int.

 

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Ron the numbers stand for the relationship between the drive shaft and the axles. A 4:10 gear ratio simply means that the drive shaft turns 4. 1 revolutions to every revolution the axle turns. hope this helps. Pete

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99'3500,quad cab,4X4,a/t
3:54

 

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I counted the ring gear and pinion gear teeth on my Dana 70 LSD when installing my Mag-Hytec diff. cover, as numerous posters on the Happy Campers BB as well as the CDW BB were wondering which ratio listed by DC was correct (3. 54:1 or 3. 55:1). The actual ratio when correctly rounded off is 3. 54:1.

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'98. 5 2500 QC 4x4, (black) SLT Sport, ISB, LWB, 3. 54 LSD, auto. , 275 hp. injectors, Glasstite Vision II "canopy", 285 BFG A/Ts on 16x8 M/T Challengers, Warn 4X Boards, Mopar fender flares, front and rear NW Custom stainless steel/rubber mud flaps, Mag-Hytec diff. cover and trans. pan, Edelbrock IAS shocks, VDO Vision gauges, BD exhaust brake and TorqLoc.

 

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You may also hear- "changed tire sizes to 245/19. 5 now my ratio is 3. 73" this is not correct. The gear ratio stays the same. the revolutions per mile are different. It is more than a mouthfull to say "my effective final drive was changed by different tires to act like a 3. 73 ratio on a stock setup. " The most important thing is RPM at the speed you want to do in what gear. Gear ratio and overdrive ratio and tire size all are a factor. If you can cruise at torque peak or just above you will get good response and good mileage.

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P. Campbell 1998. 5 ISB 2500 auto green/driftwood, driftwood rickson's 19. 5's, Pro-Zap front bumper, Mag-tech diff cover etc--