4L60E LB1 IN
2015-09-03
: Sonnax 4L60E-Lb1-In 4L60E-LB1-IN 600 file instruction uploads
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PERFORMANCE H i g h Per for ma nce TRA NSMISSION Parts Instructions GM 4L60-E, 4L65-E Line Pressure Booster Kit Part No. 4L60E-LB1 • Large Ratio Boost Assembly • Pressure Regulator Spring • O-Rings (2) Long 4L60-E Pump Pressure Regulator Spring Patent No. 6,619,323 NOTE: Fits early-style pump. Large Ratio Boost Assembly (Long) Figure 1 Late Style (short) 1.810" 46mm Use 4L60E-LB2 Early Style (long) 1.907" 48.5mm Use 4L60E-LB1 1. Verify Correct Boost Valve Application Before installing Sonnax line pressure booster kit, compare length of the OE boost sleeve to Sonnax sleeve. Overall lengths must be the same. Most early-style pump bodies will use the long boost assembly (4L60E-LB1). Some late production, early-style pump covers will use the short boost assembly (Figures 1 and 2), even though the casting number and all other features are identical. In most circumstances, comparing the original boost sleeve to the replacement is all that is required for verification (Figures 1 and 2). If you have a pump cover that is missing the boost sleeve it is possible to verify which length sleeve belongs in the bore by measuring from the very inner point of the main pressure regulator valve bore to the inner edge of the retaining ring groove. The distance for the long boost assembly is 4.740", and for the short boost assembly is 4.643". Figure 2 Early-Style Pump Cover 2. Disassembly a. Remove OE retainer and set aside for reuse. b. Remove and discard OE boost valve and sleeve. c. Remove OE bumper spring and set aside for reuse. d. Remove and discard OE large-diameter pressure regulator spring. 3. Bore Preparation O-rings included in this kit provide extra insurance toward preventing cross leaks and should always be installed. Figure 3 b. Place the two O-rings into the grooves on the boost sleeve, roll sleeve over bench to resize the O-rings, then pre-lube O-rings. Sonnax Slippery Stick™ (O-LUBE) or Door Ease® are ideal for this purpose. Late-Style Pump Cover Radial Wire Brush a. Carefully inspect snap ring grooves, feed holes or bore edges and de-burr if necessary to reduce cutting. A non-abrasive tool such as a radial wire brush (Figure 3) works best, but the bore should always be thoroughly cleaned after any de-burring. ©2015 Sonnax Industries, Inc. 4L60E-LB1-IN 09-02-15 800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com Page 1 PERFORMANCE Hi gh Pe rforma n ce T RA N S MIS S IO N P a rt s LINE PRESSURE BOOSTER KIT 4L60E-LB1 Instructions 4. Installation a. Install OE small bumper spring and Sonnax pressure regulator spring. Figure 4 Large Ratio Boost Assembly b. With open end toward the two springs, carefully insert Sonnax valve/sleeve assembly into pump cover, just far enough to reinstall OE retaining ring. OE Retaining Ring Pressure Regulator OE Bumper The Prescription for Optimum Pressure Spring Spring Stronger pressure regulator springs raise pressure equal amounts at both idle and maximum load. Many aftermarket “kit” springs are a compromise, raising pressure too much at idle and not enough at maximum Increases in Line Pressure loads (A in graph). Larger boost valves, on the other hand, have Stronger Springs vs. Larger Boost Valves a progressive effect on pressure, changing the rate of pressure increase (B in graph). High Figure 5 Key Low For a more in-depth look at raising line pressure, read The Prescription for Optimum Pressure in the Sonnax online technical library at www.sonnax.com. B Pump Tech Good Pressure Depends on a Good Pump A Line Pressure The Sonnax large ratio boost valves and stronger pressure regulator springs are designed to work together. This is an ideal combination: smooth engagements and lower load on the pump at idle, but a greater increase in pressure as the transmission is worked harder. OE Springs A - Aftermarket “Kit” Springs B - Sonnax Line Pressure Booster Kits A B Low EPC/Torque Signal Pressure High Verify Pump Specifications Excess clearance equals low pump volume and pressure. Rotor, slide and vanes .0005" to .002" Check with feeler gauge and straight edge over pump face, or with Plastigauge and bolt complete pump together. Too Loose = low pressure. Too Tight = no line rise, slide is stuck. To check, remove all pump parts and seals, assemble halves with just the pump slide and shake. You should hear pump slide moving inside. Check for Wear • If pivot is worn, replace with Sonnax pivot pin 65797. • If vane has visible wear, replace with Sonnax pump vane 1280. Worn Valve Bore Pump Position valve at normal regulation in this opening. It should not have side-to-side movement Pump Slide Spring Pump Vane Wear Shift Tech For detailed information on drilling separator plate orifices, read Drilling Orifices the Smart Way in the Sonnax online technical library at www.sonnax.com. ©2015 Sonnax Industries, Inc. 800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com Pivot Pin Slide Wiper Seal 4L60E-LB1-IN 09-02-15 Page 2
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