Differential ratios

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Differential ratios

Home > Discussion Forum > Mechanic's Corner - Transmissions

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All Messages in Thread	Author	Date
Differential ratios	Terry	6-19-07
In an effort to improve the miserable fuel economy of my 78 Dodge class C (440-1, Carter TQ 4bbl), I'd like to take the differential from its current 4.10 ratio to a 2.71 or 2.94. My calculations say those should put the RPM in the low 2000's at 65 MPH. Anyone have experience with taller ratios like that? Any problems to avoid? Thanks much.
Re: Differential ratios	Lee	7-28-07
You're on the low end of the torque band engine-wise....Maybe 3.70 +/- ? More importantly, it's not a zero-sum game....You'll be asking your torque converter to work more, with more slippage at lower rpm's, i.e.: higher & faster heat development in the TC and the fluids...... At the very least, I'd suggest adding a BIG (26 k GVW) tranny cooler with good airflow..... Good Luck!