Servicing - A/t GMC Suburban I

IDENTIFICATION

AUTOMATIC TRANSMISSION APPLICATIONS

SERVICE INTERVALS

Check transmission fluid level at each engine oil change. Under normal driving conditions, on vehicles under 8600 Gross Vehicle Weight Rating (GVWR), change transmission fluid and filter at 30,000 mile intervals. On vehicles over 8600 GVWR, change transmission fluid and filter at 24,000 miles.

If vehicle is used in severe service conditions (commercial use, trailer pulling, constant stop-and-go driving), change fluid and filter every 15,000 miles on vehicles under 8600 GVWR and at 12,000 miles on vehicles over 8600 GVWR.

Transfer Case

Check transfer case fluid every oil change or every 12 months. Check more frequently under severe conditions.

CHECKING FLUID LEVEL

Note. Vehicle must be at normal operating temperature (180-200 degrees) when checking fluid level. One pint of fluid raises level from ADD to FULL mark on dipstick in a hot transmission. DO NOT overfill.

Transmission

With vehicle parked on a level surface and engine at idle, move selector lever through all positions, ending in Park. Let vehicle idle for 3 minutes with accessories off. Remove dipstick, wipe clean and check fluid level. Fluid level should be between ADD and FULL marks on dipstick.

If vehicle has been operated for an extended time at high speed, in city traffic, or pulling a trailer, an accurate fluid level cannot be immediately determined. Transmission must cool for about 30 minutes after vehicle is parked before fluid level can be accurately checked.

Remove fill plug. Check fluid level. If level is not up to fill plug opening, add fluid until fluid reaches bottom of plug opening.

RECOMMENDED FLUID

Transmissions and transfer cases use Dexron-IIE ATF. Although Dexron-IIE is recommended, Dexron-II may still be used. Dexron-II will eventually be replaced with Dexron-IIE.

Transfer Case & Transmission

The transmission refill capacities are approximate. Refer to TRANSMISSION REFILL CAPACITIES and also refer to TRANSFER CASE REFILL CAPACITIES . Determine correct fluid level by marks on dipstick. DO NOT overfill.

TRANSMISSION REFILL CAPACITIES

TRANSFER CASE REFILL CAPACITIES

1. Raise and support vehicle. Loosen transmission oil pan bolts. Slowly pry pan loose with a large screwdriver and allow fluid to drain. Remove oil pan and gasket. Remove filter or filter screen. Replace paper element filter (if used) and seal.
2. Clean filter screen (if equipped) and pan with solvent. Blow dry with compressed air. Install oil pan with NEW gasket. Tighten bolts to specification. See «TORQUE SPECIFICATIONS»(/gmc/suburban/i-1992-1999/remont/automatic-trans/#servicing-at__torque-specifications) .
3. Add 3 quarts of Dexron-IIE. Start engine and recheck level. Add fluid until level is between FULL and ADD marks on dipstick. Test drive vehicle and recheck fluid level.

Remove drain plug from transfer case. Remove fill plug for easier draining. With fluid fully drained, reinstall drain plug. Fill transfer case to fill plug opening with Dexron-IIE.

THROTTLE VALVE (T.V.) CABLE

Note. The Hydra-Matic 4L60-E and 4L80-E are electronically controlled transmissions and do not require adjustment.

SHIFT LINKAGE

1. Ensure shift tube and lever are free in steering column. To adjust linkage, remove screw and spring washer from swivel. Turn transmission lever clockwise to stop, then counterclockwise 2 detents. This is Neutral position.
2. Place selector lever in Neutral. Locate proper position using mechanical stops, NOT shift indicator pointer. Hold swivel against shift lever. Install spring washer and screw. Tighten finger tight. Avoid applying force in either direction (along shift rod or lever) while tightening screw to specification. Refer to «TORQUE SPECIFICATIONS»(/gmc/suburban/i-1992-1999/remont/automatic-trans/#servicing-at__torque-specifications) .

NEUTRAL SAFETY SWITCH

Note. Neutral safety switch adjustment information is not available from manufacturer.

Identifying Hydra-Matic 4L80-E Oil Pan Gasket. Scheme 174

Identifying Hydra-Matic 4L60-E Oil Pan Gasket. Scheme 175

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

See also:
• TRANSMISSION REFILL CAPACITIES
• TORQUE SPECIFICATIONS