SERVICE INTERVALS
Note. Driver Information Display CHANGE TRANS FLUID message may be displayed on some models. If CHANGE TRANS FLUID message is displayed, see DRAINING & REFILLING procedure. To reset message, press and hold OFF and REAR DEFOG buttons until TRANS FLUID RESET appears in Information Center (5-20 seconds).
RECOMMENDED FLUID
Use only Dexron-III Automatic Transmission Fluid (ATF).
DRAINING & REFILLING (EXCEPT 4T80-E)
Note. If oil pan bolts are equipped with conical washers, DO NOT reuse bolts if conical washers have become reversed. (Scheme 9)
Scheme 9
- Raise vehicle, and place large drain pan under transmission oil pan. Remove transmission oil pan front and side bolts only. Loosen rear bolts about 4 turns each.
- Carefully pry pan loose using screwdriver. Allow fluid to drain. Remove remaining bolts, and remove oil pan. Discard old pan gasket. Remove filter and "O" ring or sleeve-type seal. Remove any remaining gasket material on transmission case.
- Thoroughly clean pan, magnet and screen (if metal) with solvent, and then dry using compressed air. Replace paper filter (if equipped). Install NEW "O" ring on pick-up tube or NEW sleeve into pick-up tube recess. Lubricate with clean oil before installation.
- Install filter assembly into pick-up tube recess. Install oil pan using NEW gasket, and tighten pan bolts to specification. See «TORQUE SPECIFICATIONS»(ref-1147-S01773422212000031300000) . Add required amount of fluid to transmission through filler tube.
- Start engine with gear selector lever in Park and parking brake applied. Check fluid level. See «CHECKING FLUID LEVEL»(ref-1147-S20715169542000031300000) . Add fluid if necessary. DO NOT overfill.
DRAINING & REFILLING (4T80-E)
| IMPORTANT | The HYDRA-MATIC 4T80-80 transmission has a filter under the side cover that requires service only during transmission overhaul. Scavenging screens are beneath the bottom pan, which you must replace when you change the transmission fluid. |
- Raise the vehicle and support. Place a drain pan under the transaxle bottom pan in order to catch the fluid.
- Loosen the bottom pan bolts. Drain any fluid in the pan. Remove the bottom pan bolts, pan, and seal. (Scheme 10) Inspect the bottom pan for dents or nicks on the sealing surface. If damaged, replace.
- For proper sealing, clean and dry the bottom pan and the case sealing surfaces. In order to maintain proper bolt torque, the bolts and tapped holes in the case must be clean and dry.
- Install the bottom pan, new seal, and bolts. Finger-tighten the bolts. (Scheme 10) Tighten the pan bolts 3 times to the proper specification, in the sequence shown. (Scheme 11)
- Lower the vehicle. Add DEXRON-III® transmission fluid as required.
