4R44E-5R55E ziP KiT
installation & Testing Booklet
©2012 Sonnax Industries, Inc.
4R44E-5R55E-ZIP-Booklet 01-26-12
800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com
Page 7
TIME TESTED • INDUSTRY TRUSTED
Critical Wear Areas & Vacuum Test Locations
Note:
OE valves are shown in rest position and should be tested in rest position unless otherwise indicated. Test locations are pointed
to with an arrow. Springs are not shown for visual clarity. Low vacuum reading indicates wear and Sonnax parts noted for replacement.
For specific vacuum test information, refer to individual part instructions included in kits and available at
www.sonnax.com
.
20
25
15
0
10
5
30
VACUUM
TEST
*Part numbers with an asterisk (*) are included in this Zip Kit. Other part numbers are available separately.
Pressure Regulator Valve
• Delayed engagement due to poor converter fill
• High/Low line pressure
• Low cooler flow at idle
• Overheated converters
Replace with Sonnax Part No.
37947-05K
TCC Modulator Valve
• No TCC apply
• Code 1741
• Low cooler flow
• Poor converter fill & delayed engagements
• Engine stall on forward engagement
Replace with Sonnax Part No.
37947-07K
Boost Valve Assembly
• Soft shifts
• Delayed reverse
• Low line pressure
• Poor modulator control
Replace with Sonnax Part No.
37947-01K
OE Ratio
37947-03K*
Increased Ratio
EPC Boost Valve,
Forward Modulator Valve
& Reverse Modulator Valve
• Poor shift quality
• Delayed forward/no reverse
• 2nd Gear starts
Replace with Sonnax Part No.
37947-11K
Coast Clutch Valve
• No 4th gear (4R)
• No 2nd or 5th gear (5R)
• No engine braking in D3 to low
• No coast clutch apply
Replace with Sonnax Part No.
37947-33K
TCC Regulator Valve
• Converter apply issues
• High TCC slip RPM
• Codes 628 and 1741
• TCC surge/cycle
• High fluid/converter temperatures
Replace with Sonnax Part No.
37947-09K
37947-38
To vacuum test this port: invertet
valve and prop outboard with a
Torlon checkball.
