I was watching trucks one day and they put a second overdrive on a truck and it was controlled by a switch wired in the cab. Would it be possible to put a second overdrive on these 4l60e transmissions to reduce the RPM's on the highway. It connects between the transmission and the drive shaft.
2004 EXC Silverado 6.2L
Mods:
6.2L L92, Ported and Polished stage 3 heads, 95mm Throttle Body, 100mm MAF, NA, Pacesetter LT Headers, Magnaflow X-Pipe Muffler, Electric Fans, 160* thermostat, 2" Drop Shackles, Hellwig Sway Bars Front and Rear, Monroe Reflex Shocks, NGK Spark Plugs, AMW Oil Catch Can, 17"x10" wheels on Kuhmo Tires.