Re: Overdrive?
The 4l60 and 4l65 are essentially the same transmission. the 4l65 has more planet gears in the planetarys. If I remember correctly the 4l60 planetarys had 4 planet gears in the planetaries and the 4l65 has 5. Ratios are the same or close too same just a stronger planetary gear. Overdrive is inside the transmission not a separate unit.
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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