Automatic Transmission Servicing Cadillac Escalade GMT400

MODEL IDENTIFICATION

MODEL IDENTIFICATION - TRUCKS

APPLICATION

AUTOMATIC TRANSMISSION/TRANSAXLE APPLICATION - TRUCKS

TRANSFER CASE APPLICATION - TRUCKS

OIL PAN GASKET IDENTIFICATION

Note. Oil pan gasket identification for Tracker 3-Speed (3L30) unavailable from manufacturer.

Identifying Hydra-Matic 3T40 Oil Pan Gasket. Scheme 1

Identifying Hydra-Matic 4L60-E Oil Pan Gasket. Scheme 2

Identifying Hydra-Matic 4L80-E Oil Pan Gasket. Scheme 3

Identifying Hydra-Matic 4T60-E & 4T65-E Oil Pan Gasket. Scheme 4

Scheme 5

Transaxle ("U" Series)

Check transaxle fluid level at each engine oil change. For vehicles operated under normal driving conditions, change transaxle fluid and filter every 100,000 miles. For vehicles operated under severe driving conditions, change transaxle fluid and filter every 50,000 miles.

Transmission (Astro, Blazer, Bravada, Envoy, Jimmy, Safari, Sonoma & S10 Pickup)

Check transmission fluid level at each engine oil change. For vehicles operated under normal driving conditions, change transmission fluid and filter every 50,000 miles. For vehicles operated under severe driving conditions, change transmission fluid and filter every 15,000 miles.

Transmission ("C" & "K" Series, Escalade, Express, Savanna, Sierra, Silverado, Suburban, Tahoe & Yukon)

Check transmission fluid level at each engine oil change. For vehicles operated under normal driving conditions, change transmission fluid and filter every 100,000 miles. For vehicles operated under severe driving conditions or for vehicles over 8600 GVWR, change transmission fluid and filter every 50,000 miles.

Transmission ("P" Series)

Check transmission fluid level at each engine oil change. Manufacturer recommends changing transmission fluid and filter every 50,000 miles.

Transmission (Tracker)

Check transmission fluid level at each engine oil change. Under normal driving conditions, manufacturer recommends changing transmission fluid and filter every 100,000 miles. Under severe driving conditions, manufacturer recommends changing transmission fluid and filter every 15,000 miles.

Transfer Case (Except Tracker)

Check transfer case lubricant at every oil change or every 12 months. Under severe conditions check more frequently.

Transfer Case (Tracker)

Check transfer case fluid level at each engine oil change. Under normal driving conditions, manufacturer recommends changing transfer case fluid every 30,000 miles. Under severe driving conditions, manufacturer recommends changing transfer case fluid every 15,000 miles.

CHECKING FLUID LEVEL

Note. Transmission/transaxle must be at normal operating temperature (180-200°F) when checking fluid level. One pint of fluid will raise level from ADD 1 PT. or .5L to FULL mark on dipstick with transmission/transaxle at normal temperature. DO NOT overfill.

Transmission/Transaxle

With vehicle parked on a level surface and engine at idle, move selector lever through all positions, ending in Park. Remove dipstick, wipe clean and check fluid level. Fluid level should be between ADD 1 PT. and FULL marks on dipstick. If vehicle has been driven for extended period of time at high speed, in city traffic or pulling a trailer, an accurate fluid level cannot be immediately determined. Allow transmission/transaxle to cool for about 30 minutes after vehicle is parked, then check fluid level.

Transfer Case

Remove fill plug. Check oil level. If level is not up to fill plug opening, add lubricant as necessary.

RECOMMENDED FLUID

Transaxles and transmissions use Dexron-VI ATF. For additional fluid information, see TSB 04-07-30-037D; RELEASE OF DEXRON-VI AUTOMATIC TRANSMISSION FLUID (ATF) . All transfer cases EXCEPT Tracker, NV136, NV236 and NV246 use Dexron-III ATF. Tracker transfer case uses GL-4 75W-90 lubricant. Transfer case models NV136, NV236 and NV246 use Auto-Trac® II Fluid (GM P/N 12378508).

The transmission/transaxle refill capacities given below are approximate. Correct fluid level should always be determined by marks on dipstick, rather than by amount of fluid added. DO NOT overfill transmission/transaxle. See appropriate REFILL CAPACITIES table.

TRANSMISSION/TRANSAXLE REFILL CAPACITIES

TRANSFER CASE REFILL CAPACITIES

1. Loosen transmission/transaxle oil pan bolts. Pry pan loose and allow fluid to drain. Remove oil pan, gasket, and filter or filter screen. Replace paper element filter (if equipped).
2. Clean filter screen (if equipped) and pan with solvent, and blow dry with compressed air. Install oil pan with NEW gasket. Tighten transmission/transaxle oil pan bolts to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt400-1998-2000/remont/automatic-trans/#automatic-transmission-servicing__torque-specifications) . Add fluid to proper mark on dipstick.

Remove drain plug from transfer case. Remove fill plug for easier draining. With fluid drained, reinstall drain plug. Fill transfer case to bottom of filler plug opening with appropriate fluid. Reinstall transfer case fill plug.

SHIFT LINKAGE

Note. Shift linkage adjustment information for "G", "L", "M", "S" and "T" series is not available from manufacturer.

"C" & "K" Series

1. Ensure shift cable is not restricted. Set transmission range selector lever to Park. Apply parking brake. Raise and support vehicle. At transmission, set transmission range select lever to Park by rotating range select lever clockwise until it reaches full mechanical stop position.
2. Slide black retaining clip forward on range select lever cable end to allow white lock button to be pushed out. Push white lock button out enough to free metal core adjust body inside cable end. DO NOT push white lock button completely out. Ensure cable end is free from debris. Lower vehicle.
3. Ensure parking brake is applied. Turn ignition switch to ON position. Move transmission shift lever through all ranges 10 times. Move transmission shift lever to Park. Turn ignition switch to OFF position. Raise and support vehicle.
4. At transmission, set transmission range select lever to Park by rotating range select lever clockwise until it reaches full mechanical stop position. Push in white button to secure core adjuster body inside range select lever cable end. Slide black retainer clip rearward over cable end until it covers white lock button. Lock clip over cable end. Lower vehicle.
5. Turn ignition switch to ON position. Ensure all transmission shift light positions engage and illuminate. If not all transmission shift light positions engage and illuminate, repeat procedure. Ensure engine starts only in Park and Neutral.
6. If engine does not start in PARK or NEUTRAL positions, adjust Park Neutral Position (PNP) switch. See «PARK NEUTRAL POSITION (PNP) SWITCH»(/cadillac/escalade/gmt400-1998-2000/remont/automatic-trans/#automatic-transmission-servicing) . Turn ignition switch to LOCK position. Ensure ignition key can only be removed in PARK position. Start engine and ensure transmission engagements are same as shift light positions.

"P" Series

1. Remove clevis pin retaining clip and clevis pin. Move shift lever arm at transmission fully forward and then pull back 2 detents to Neutral.
2. Loosen jam nut and adjust cable end to align with shift lever arm at transmission. Tighten jam nut. Reinstall clevis pin and clip. Ensure engine starts in Park and Neutral only.

Tracker

1. Remove center console covers. Place gearshift lever in Neutral. Loosen adjusting nut and lock nut.
2. Ensure shift lever on transmission is in Neutral position. Pull shift cable tight. Tighten adjusting nut, then lock nut. Ensure gearshift lever operates properly in all gear ranges. Install console covers.

"U" Series

1. Apply parking brake. Carefully pry shift cable terminal from manual shaft lever pin. Fully lift adjuster lock button. tab on cable adjuster to adjust cable in cable mounting bracket.
2. Rotate range select lever at transmission fully counterclockwise to Park, then rotate clockwise 2 clicks to Neutral. Inside vehicle, move shift lever fully down to Low gear position. Slowly push up on shift lever while holding slight pressure forward. Shift lever will stop when Neutral position is reached.
3. Pull shift cable terminal enough to attach terminal to manual shaft lever pin. DO NOT move cable excessively. Ensure shift lever does not move out of Neutral. Press adjuster lock button down flush with adjuster body. Shift transmission to Park. Start engine. Ensure indicated gear positions match vehicle response.

LOW BAND SERVO (TRACKER WITH 3L30)

1. Raise and support vehicle. Remove transmission oil pan. Remove oil filter screen. Remove Torque Converter Clutch (TCC) pipes from valve body. Disconnect wires from TCC solenoid.
2. Remove 6 bolts securing reinforcement plate. Remove reinforcement plate. Remove 4 bolts and low band piston servo cover.
3. Hold servo piston with an open-end wrench. Loosen lock nut on adjusting sleeve. Using a torque wrench with a 5 mm Allen head socket, tighten servo piston adjusting screw to 40 INCH lbs. (4.5 N.m).
4. Back off servo piston adjusting screw exactly 5 turns. Tighten lock nut to 14 ft. lbs. (19 N.m). Ensure adjusting screw does not turn while tightening lock nut.
5. Replace servo piston cover gasket. Install servo piston cover and tighten to 18 ft. lbs. (24 N.m). Install reinforcement plate and tighten to 14 ft. lbs. (19 N.m). To complete installation, reverse removal procedure. Tighten bolts to specification. See «TORQUE SPECIFICATIONS»(/cadillac/escalade/gmt400-1998-2000/remont/automatic-trans/#automatic-transmission-servicing__torque-specifications) .

"C", "G", "K", "L", "M", "P", "S" & "T" Series

Disconnect negative battery cable. Place transmission shift lever in Neutral or Park position. Loosen switch retaining bolts and rotate switch slightly. Tighten bolts to specification. See TORQUE SPECIFICATIONS . Check switch for proper operation. Repeat procedure as necessary until engine starts in Park and Neutral positions.

Raise and support vehicle. Place transmission shift shaft in Neutral position. Loosen switch mounting bolts. Use Park/Neutral Switch Alignment Tool (J-41545) to align slots of PNP switch to Neutral position. Align flats of PNP switch to flats of shift shaft. Tighten PNP switch bolts to specification. See TORQUE SPECIFICATIONS . Ensure vehicle does not start in any gear selector position except Park and Neutral.

Tracker (3L30 3-Speed)

1. Disconnect negative battery cable. Ensure gearshift lever and transmission shift lever are in Neutral. Loosen PNP switch retaining bolt.
2. Disconnect PNP switch 2-wire harness connector. Connect a DVOM to PNP switch connector terminals. Rotate PNP switch fully clockwise (downward).
3. Slowly rotate PNP switch counterclockwise (upward) until a "click" sound is heard and DVOM displays continuity. Tighten switch retaining bolt to 15 ft. lbs. (20 N.m). Connect PNP switch harness connector and negative battery cable.

Tracker (M41 4-Speed)

1. Disconnect shift cable from PNP switch. Loosen PNP switch retaining bolt. Move transmission shift lever rearward, then back 2 notches to obtain Neutral position. Ensure gearshift lever is in "N" position. Remove transmission shift lever.
2. Ensure neutral reference line and cut groove in PNP switch is aligned. Rotate PNP switch as necessary. Tighten PNP switch retaining bolt to 44 INCH lbs. (5.0 N.m). Install transmission shift lever and tighten nut to 115 INCH lbs. (13.0 N.m). Install shift cable. Ensure engine starts with transmission in Neutral and Park only.

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

See also:
• TORQUE SPECIFICATIONS
• PARK NEUTRAL POSITION (PNP) SWITCH