Dodge Diesel - Diesel Truck Resource Forums - Changing gear ratio from 4.10 to 3.54

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accordionjohn

10-06-2002 08:59 PM

Changing gear ratio from 4.10 to 3.54

I just purchased a '97 Ram 2500 CTD 4X4 with a gear ratio of 4.10. From what I can remember reading on the subject of the drivetrain, I believe the ring and pinion gears can be changed in the differential to convert to a 3.54. Just wondering if anyone out there has attempted this changeover or had it done successfully to improve mpg as I am more interested in better mpg than towing power. Also, I'm guessing that both front and rear axles must have this change performed simultaneously.

vssman

10-07-2002 12:13 PM

Re:Changing gear ratio from 4.10 to 3.54

How about a taller tire? A 255/85 will give you about 3 to 3 1/2 inches lift and thus lower your gear ratio a bit. It's easy to correct the speedometer on your truck too - Just replace the VSS gear.

DieselDaze

10-07-2002 12:54 PM

Re:Changing gear ratio from 4.10 to 3.54

Hey accordionjohn If you do buy the new gears, Id have an interest in buying your 4:10's. I currently run the 3:54 gears but I'd like to hang on to them. However, I would be VERY interested in your old 4:10's. Let me know. You can either PM me or email me. Thanks Rich.

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