NOTE: The compressed air supply must be free of
all dirt and moisture. Use a pressure of 30 psi.
Remove oil pan and valve body. See Valve body
recondition.
Apply air pressure to the holes in the special tool,
one at a time.
Listen for the clutch to apply. It will give a slight
thud sound. If a large amount of air is heard escap-
ing, the transaxle must be removed from vehicle, dis-
assembled and all seals inspected.
OVERDRIVE CLUTCH
Apply air pressure to the overdrive clutch apply
passage and watch for the push/pull piston to move
forward. The piston should return to its starting
position when the air pressure is removed.
UNDERDRIVE CLUTCH
Because this clutch piston cannot be seen, its oper-
ation is checked by function. Air pressure is applied
to the low/reverse or the 2/4 clutches. This locks the
output shaft. Use a piece of rubber hose wrapped
around the input shaft and a pair of clamp-on pliers
to turn the input shaft. Next apply air pressure to
the underdrive clutch (Fig. 31). The input shaft
should not rotate with hand torque. Release the air
pressure and confirm that the input shaft will rotate.
REVERSE CLUTCH
Apply air pressure to the reverse clutch apply pas-
sage and watch for the push/pull piston to move rear-
ward. The piston should return to its starting
position when the air pressure is removed.
2/4 CLUTCH
Apply air pressure to the feed hole located on the
2/4 clutch retainer. Look in the area where the 2/4
piston contacts the first separator plate and watch
carefully for the 2/4 piston to move rearward. The
piston should return to its original position after the
air pressure is removed.
LOW/REVERSE CLUTCH
Apply air pressure to the low/reverse clutch feed
hole passage. Look in the area where the low/reverse
piston contacts the first separator plate. Watch care-
fully for the piston to move forward. The piston
should return to its original position after the air
pressure is removed.
FLUID LEAKAGE
The 42LE is a dual sump transaxle. The transaxle
uses both automatic transaxle fluid (ATF) for the
main sump and hypoid gear lube for the differential
sump. When diagnosing a leak, it is important to dis-
tinguish which type of fluid is leaking. Factory fill
ATF is dyed red, while differential hypoid oil is
brown in color and has a distinctive odor.
There are two seals at the boundary of the two
sumps. There is a weep hole in the right side of the
transaxle case (Fig. 32) which vents the area
between the two seals. If oil is leaking from the weep
hole, there is at least one seal leaking. Never plug
the weep hole to correct a leaking condition. Plugging
the weep hole could result in contaminating one or
both transaxle sumps, low oil level, poor transaxle
performance or transaxle failure. In order to correctly
repair this type of leak the transaxle must be
removed from the vehicle and both transfer shaft
seals replaced. Refer to Transfer Shaft Seal Replace-
ment procedure in this section.
FLUID LEAKAGE-TORQUE CONVERTER HOUSING
AREA
(1) Check for source of leakage. Fluid leakage from
the torque converter area may originate from an
engine oil leak, a differential oil leak or an ATF oil
leak. The area should be examined closely.
(2) Prior to removing the transaxle, perform the
following checks:
• When leakage is determined to be automatic
transmission fluid, check fluid level prior to removal
of the transaxle and torque converter.
• High oil level can result in oil leakage out the
vent. If the fluid level is high, adjust to proper level.
• After performing this operation, inspect for leak-
age. If a leak persists, perform the following opera-
tion on the vehicle. This will determine if it is the
torque converter or transaxle that is leaking.
Fig. 31 Testing Underdrive Clutch
1 – AIR PRESSURE TEST PLATE 6599–1
2 – AIR NOZZLE
21 - 24 42LE TRANSAXLE LH
DIAGNOSIS AND TESTING (Continued)
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