Forward, Coast Clutch Support & Housing

FORWARD, COAST CLUTCH SUPPORT & HOUSING 4T80-E TRANSAXLE

DISASSEMBLE







1. Remove and discard oil seal rings and cooler return seal.
2. Inspect clutch support for seal ring groove damage, checkball damage and bushing and transfer sleeve for damage and wear.
3. Install new cooler return seal. Do not distort seal shape in bore.




4. Install new oil seal rings, then low roller clutch. Turn clutch counterclockwise as far as it will go. Tabs on clutch must rest on face of support.
5. Remove snap ring, then forward clutch backing plate, forward clutch fiber plates and steel plates.
6. Remove apply plate, then coast clutch fiber plates and steel plate.




7. Remove coast clutch apply plate, then compress spring and retainer assembly using clutch spring compressor tool No. J-23327, or equivalent.
8. Remove snap ring. Do not overexpand.
9. Remove spring and retainer assembly, then remove compressor tool.
10. Remove coast clutch piston seal and ball capsule assembly, then apply ring.
11. Remove forward clutch piston and seals.

INSPECTION
1. Inspect forward clutch housing for plugged feed holes.
2. Inspect for worn or damaged splines.
3. Inspect checkball for leaks.
4. Inspect welds for cracks.
5. Inspect coast clutch piston seals for damage. Replace piston if damage is found.
6. Inspect forward and coast clutch pistons for cracks or damage to seal groove.
7. Inspect spring and retainer assembly for damaged cage and distorted or missing springs.
8. Inspect retainer and ball assembly for leaks.
9. Inspect bands for excessive wear.

ASSEMBLE
1. Install new piston seals onto forward clutch piston. Ensure outer seal does not roll backward.
2. Install forward clutch piston using forward clutch inner seal protector tool No. J-39055, or equivalent.
3. Install apply ring.
4. Install coast clutch piston seal and ball capsule assembly using coast clutch inner seal protector tool No. J-39056, or equivalent. Ensure outer seal does not roll backward.
5. Install then compress spring and retainer assembly using clutch spring compressor tool No. J-23327, or equivalent.
6. Install snap ring. Do not overexpand. Remove compressor tool.
7. Install coast clutch apply plate, then coast clutch plates and steel plate.
8. Install apply plate, then forward clutch fiber and steel plates and backing plate.
9. Install snap ring.
10. Install thrust bearing onto forward coast clutch housing, then connect forward clutch support to forward/coast clutch assembly.
11. Install coast clutch hub with thrust bearing, forward sprag race and input internal gear and flange into forward/coast clutch housing. When splines on hubs are properly engaged, input carrier bushing will drop below forward/ coast clutch support hub approximately 2-3 mm and a dull metal sound can be heard.
12. Install input carrier and reaction internal gear with thrust bearing onto input internal gear.
13. Install final drive sun gear shaft.
14. Install thrust bearing, parking pawl gear and snap ring.