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Jeep Grand Cherokee 1999-2004 WJ WG Factory Workshop Service Repair Manual download

1) Safety & preparation
- Park on level ground, set parking brake, chock wheels. Warm the engine/transmission to normal operating temperature (drive until radiator fan cycles or ~50–80°C / 120–175°F) — hydraulic clearances change with temperature and adjustment must be done hot.
- Raise and support the vehicle where necessary to access the transmission’s side.

Theory: band clearances vary with temperature. Adjusting cold produces incorrect band preload when hot and will either drag or leave excessive freeplay.

2) Locate the band-adjustment access
- Find the transmission inspection/adjustment cover on the transmission case (driver side on most WJ transmissions). Remove the cover (and O-ring if present) to expose the adjuster / pushrod and locknut for the band(s).

Theory: bands are adjusted externally via a pushrod/adjuster that sets the mechanical preload against the band apply assembly; the cover merely hides that mechanism.

3) Identify which band you are adjusting
- Determine which band corresponds to the symptom (low-reverse band vs forward band). Typical autos use separate adjustments for the low/reverse band and the intermediate/forward band. The workshop manual and the position of the pushrod tell you which band you’re working on.

Theory: each band holds a drum/planetary member for a particular gear range. Misadjustment of the specific band produces specific faults (e.g., slipping/flare in 1–2 or slipping in reverse).

4) Preload / seating procedure
- With the engine OFF but transmission hot, select PARK (or as the manual specifies) so the parking pawl/park detent is engaged or the range positions are correct for the adjustment. Back off the adjuster if it’s already tight until the band is free (to start from a known condition).

Theory: you want to start from neutral freeplay, then bring the band into contact and set the correct residual freeplay. If you begin tightened you can overtighten and cause drag.

5) Bring the band into light contact
- Turn the adjuster inward (screw in) slowly until you feel the adjuster make light contact with the band/drum (you’ll feel resistance). Do this by feel — do not overtighten.

Theory: the adjuster pushes a rod that preloads the band against the drum. The correct setting is “just touching” so you can then apply the specified backing-off.

6) Set specified freeplay / backing-off
- Back the adjuster out the specified amount (factory specification). If you do not have the numeric spec at hand: back off until there is a small, definite freeplay — the band should not drag but should have only a small clearance. Lock the adjuster nut while holding the adjuster in position. Reinstall the inspection cover and O-ring.

Theory: bands require a small air gap (freeplay) so they do not drag when not applied and so hydraulic apply travel can clamp the drum fully when commanded. The specified freeplay compensates for lining thickness, heat expansion and hydraulic travel.

7) Fluid check & cleanup
- Check transmission fluid level and condition after adjustment and top if necessary. Clean any spilled fluid and torque cover fasteners to spec.

Theory: correct fluid level ensures correct hydraulic pressure and torque converter operation; low or dirty fluid can mimic band faults.

8) Road test and recheck
- Road-test through all gears. Confirm shift quality (no flare, no slip, crisp engagement) and absence of overheating or noises. After a short break, recheck adjustment and fluid level. Re-adjust if necessary.

Theory: dynamic testing confirms the hydraulic system and band apply under load; adjustments can settle after the first few engagements and require re-checking.

How the repair fixes common faults (brief)
- Symptom: slipping, flare or burned smell on 1–2 shifts or in Reverse
- Cause: excessive band clearance (too loose) or worn band lining → the band cannot clamp the drum quickly or firmly, allowing slip until hydraulic pressure rises, causing shift flare, heat and wear.
- Repair: reducing clearance (bringing band into correct preload) shortens the apply travel and lets the band clamp the drum at the designed hydraulic pressure, eliminating slip and flare.

- Symptom: harsh shifts, dragging, gear holding or overheating
- Cause: band too tight (overtightened) → band drags when not commanded, causing friction, heat, burnt bands and abrupt engagements.
- Repair: restoring the correct freeplay removes drag and restores smooth release and apply timing, preventing overheating and premature lining wear.

Key cautions (short)
- Always adjust hot and to factory specifications. Do not overtighten — dragging bands destroy linings and clutches. Do not rely on feel alone for final setting if factory backing-off specs exist. If bands are excessively worn or lining is delaminated, adjustment is only a temporary fix; band or drum replacement (or rebuild) is required.

End.
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