Introducing the
6-Speed 6F35
Transmission
by David Skora
Valvebody Pro Tech Director
valve body comes right off. The case easily.
splits
When pulling the front case, which includes the dif- ferential ring gear and pump assem- bly, the differen- tial, chain assem- bly, and some of the drive shells and planets came out, too. This was probably because the unit was on its side. If it were ver- tical, just the front case assembly half would have come off.
One of the
Figure 1
new 6F35 6-speed transaxle. Externally it looks like a cross between a CD4E and an AF21B. Internally it looks like a little Allison LCT 1000 with three sets of planets and five sets of clutches. But the clutches operate the geartrain differ- ently than an Allison. This unit may be a preproduction
S
or a test unit, since there were no exter- nal tags or labels to identify it. But each internal part was carefully scribed with a part number. Some of the general features of this
unit include:
40
tarting in 2009, Ford Escape, Mercury Mariner, and Mazda Tribute will be equipped with a
• A fill tube with a dipstick. • No access to the filter unless the case is split. • A fluid drain plug located at the bottom of the case. There’s a pass-through electrical
connector on the side pan. It has a line tap, and additional taps for check- ing lube pressure, compensator feed, 3-5-reverse clutch, and 4-5-6 clutch (figure 1). Behind the side pan is a valve body
with seven solenoids and electrical con- nectors for the Transmission Range sensor (TR) and Turbine Speed Sensor (TSS). After disconnecting the connec- tors and removing several bolts, the
other unusual fea- tures for this unit is its ability to pro-
vide lubrication when flat towed behind another vehicle. When the differential rotates, the chain picks up fluid and allows some of the fluid to fall into a trough at the upper part of the case. With the engine off and being flat towed, fluid in the trough can flow past the lube checkball and lubricate the rear planet assembly (figure 2). If you see one of these with a planetary failure, make sure the lube checkball is present and not stuck. Inside, the unit looked very clean
and straightforward. It looks like the only tricky part to assemble would be the Belleville spring under the 2-6 clutch span ring. Other than that, it
GEARS May/June 2010
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