![]() ![]() With GM's latest refinements and electronic controls, the 4L80E is stronger and much smarter than its TH400 predecessor, even with its Fourth-gear overdrive. It's GMs latest offspring of the TH400 trans, and we all know how tough that piece is. The 4L80E transmission is original equipment for all heavy-duty GM truck applications. And the wear and tear on your engine is reduced, since the overdrive will have you cruising at about 1,000 rpm less on the highway. In street applications, the fuel savings alone are probably worth the price of an overdrive, especially if you're running a big-block. Add the Premier gear splitter valve body and a Chevy truck equipped with 3.73 or 4.10 rearend gears can tackle just about any hill you can find.ĬOPYRIGHT 1997 McMullen Argus Publishing, Inc Premeir also can upgrade the 4L80E to incorporate different gear ratios, including a 2.75 or 3.10 first and a 1.60 second gear. The difference is phenomenal as the 4L80E has a lower first-gear ratio (2.48:1) and a. If you own an older Chevrolet with a TH400 or TH350 automatic, Premier also has a kit to upgrade to a late model 4L80E. Currently, Premier only has a dash-mounted switch available but they are looking towards finding a suitable switch that mounts on the shiftlever. The Premier gear splitter comes with a new valve body, distribution block, solenoid, filter, gasket and activation switch. The addition of a few extra lines (stainless steel) within the valve body accomplishes this task. that looks similar to a brake porportioning valve, to actuate the various valves within the Premier valve body system. This is accomplished with an extra distribution block. Each gear has its own series of clutch and band combinations to shift the bans into overdrive. The accompanying chart shows the rpm and mile per hour differences with and without the valve body activated on a Chevy truck with 3.73 rearend gears and 31-inch diameter tires.Īlthough switching on the ban's overdrive unit sounds simple enough, the guys at Premier say it most definitely is not as easy as it sounds. 75 gear on the 4L80E overdrive this can translate to a 14 percent drop between gears. A wire attaches to a small solenoid that activates the system from anywhere in the truck's cab. The Premier valve body simply bolts into place. Installation is a simple matter of draining the transmission oil from the 4L80E pan and unbolting the factory valve body assembly. The combination gives the Chevrolet owner six gears to choose from.Ĭonsidering the cost of an average gear splitter or overdrive unit, around $2,000 plus the cost of shortening and balancing the driveshaft, the Premier valve body is an excellent value at around $895. Thus, you can shift the transmission from first low to first overdrive, then second low to second overdrive, then third gear and overdrive. Since the 4L80E automatics already have a built in overdrive unit, the Premier valve body simply activates the overdrive in between each transmission gear. The Premier gear splitter does away with all of the installation hassles by simply replacing the factory valve body in late-model CM 4L80E, four-speecl automatic transmissions. Traditional gear splitters consist of a planetary gear set that is bolted to the output shaft of the transmission The gears are heavy and are operated by a solenoid and activated by a switch mounted to the shift handle inside the truck. Instead of bolting on a complete planetary gear set or an overdrive unit to the rear of the transmission, which also requires shortening and rebalancing the driveshaft, Premier developed a new valve body that does the same job without any further modifications to the transmission or driveshaft. The guys a Premier Performance have taken the process of gear splitting a step further. The advantage of having two or three extra gears can make a tremendous difference in tackling steep grades or when towing heavy loads. This ends up working like an extra gear between each of the transmission's factory ratios. To solve this problem, enthusiasts have resorted to bolting on gear splitters or overdrive units to their heavy-duty transmissions. Yet, shifting into first is too low and the engine rpm jumps up past the peak torque range. How often has a truck owner lost momentum climbing up a steep grade in second gear. Off-road enthusiasts know the advantages of having the right gear combination in their truck's rearend and transmission. Split ends: turn your GM 4L80E automatic transmission into a six-speed.(gear splitting) ![]() (6 speed :D - I am printing out now to review) Handle a big lock? Are they limited to 4 speeds now? Regarding 700R4 - that was the transmission I got in my 1983 S-10 -what a wimpy trans - I imagine they have changed since then too! And they can ![]()
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