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The Automatic Transmission 42RLE is a four-speed transmission that is a conventional hydraulic/mechanical assembly controlled with adaptive electronic controls and monitors. The hydraulic system of the transmission consists of the transmission fluid, fluid passages, hydraulic valves, and various line pressure control components.
- Safety first
- Park on level ground, set parking brake, chock rear wheels.
- Wear safety glasses and gloves.
- Never rely on a hydraulic jack alone — always use jack stands rated for your vehicle’s weight.
- If you are uncomfortable at any point, stop and get professional help.
- Tools (each tool described and how to use it)
- Floor jack (hydraulic)
- Purpose: lifts the vehicle so you can remove the wheel.
- How to use: position under manufacturer-recommended lift point, pump handle to raise. Lower by slowly turning release valve. Always support with jack stands once raised.
- Jack stands (pair)
- Purpose: safely support the vehicle while you work.
- How to use: set to the same height under the manufacturer-recommended support points and lower the vehicle onto them — do not work under a vehicle supported only by a jack.
- Wheel chocks (pair)
- Purpose: prevent vehicle roll.
- How to use: place behind and/or in front of wheels remaining on the ground.
- Lug wrench or impact wrench with correct socket
- Purpose: loosen and tighten wheel lug nuts.
- How to use: break lug nut torque while car is still on ground, fully remove once lifted. Use cross pattern to torque when reinstalling.
- Metric socket set and ratchet (including deep sockets)
- Purpose: remove nuts/bolts securing tie rod and related components.
- How to use: select correctly sized socket, attach to ratchet or breaker bar; apply steady force to break loose fasteners.
- Combination wrenches (metric)
- Purpose: hold inner tie rod or jam nut while loosening outer tie rod end or to hold other fasteners.
- How to use: select appropriate size, place on nut/bolt, and turn with steady force.
- Torque wrench (click-type, appropriate range for steering fasteners)
- Purpose: tighten nuts to manufacturer-specified torque to ensure safety and prevent loosening or thread damage.
- How to use: set to required torque, tighten until wrench clicks; check factory manual for exact values.
- Tie rod puller / ball joint separator (Pitman/pickle fork style or threaded puller)
- Purpose: separate the outer tie rod end’s ball stud from the steering knuckle.
- How to use: place puller between knuckle and ball stud, tighten screw to force stud out. If using a pickle fork, hammer it between the joint — note pickle forks can damage rubber boots and are less desirable.
- Hammer (ball-peen or claw)
- Purpose: used with a pickle fork or to tap components free.
- How to use: strike carefully; avoid excessive blows that can damage components.
- Pliers (needle-nose and slip-joint)
- Purpose: remove cotter pins, hold small parts.
- How to use: grip and pull cotter pin or bend to remove.
- Adjustable wrench
- Purpose: useful when you don’t have an exact-size wrench.
- How to use: snug to the nut to avoid rounding fasteners; not a substitute for proper-sized wrench for high-torque work.
- Measuring tape or marker
- Purpose: mark the position/number of turns on the thread to help maintain alignment when installing the new end.
- How to use: count & record number of turns or mark the threaded sleeve relative to stud before removal.
- Grease gun (if new tie rod has grease fitting)
- Purpose: lubricate new tie rod end through zerk fitting.
- How to use: attach hose to fitting, pump grease until boot fills (do not over-pressurize).
- Penetrating oil (e.g., PB Blaster)
- Purpose: loosen rusted or seized nuts.
- How to use: spray on fastener, wait 5–15 minutes, then attempt removal.
- Wire brush
- Purpose: clean mating surfaces and threads before reassembly.
- How to use: brush away rust/dirt to ensure good seating and accurate torque.
- Replacement cotter pins and new nuts (if original are single-use / damaged)
- Purpose: secure castle nuts on tie rod end.
- How to use: install new cotter pin through nut and stud, bend ends to lock.
- Optional but strongly recommended: breaker bar, impact sockets, wheel hub stands
- Purpose: breaker bar gives extra leverage to free stubborn fasteners; impact tools speed removal but are not required.
- How to use: use same socket sizes; be careful with impact tools (can snap bolts if misused).
- Parts: what you may need and why
- Outer tie rod end (vehicle-specific, OEM or quality aftermarket like MOOG/ACDelco/TRW)
- Why: if you have play, torn boot, grease leakage, clunking, or uneven tire wear the outer tie rod end is usually worn and must be replaced.
- Inner tie rod or tie rod assembly (only if inner component is worn)
- Why: if you detect play at inner tie rod or slop in steering column to wheel, replace inner as well — many times outer failure masks inner wear.
- New castle nut / nut specified for the tie rod end (if original is single-use or damaged)
- Why: some nuts are torque-to-yield or are deformed for safety; replace if not reusable.
- New cotter pin
- Why: cotter pins are single-use safety devices; always install a new one.
- New jam nut (if damaged)
- Why: jam nuts lock tie rod end position; replace if rounded or corroded.
- Grease (chassis grease) if zerk fitting used
- Why: proper lubrication extends life of the ball joint.
- How to tell if replacement is required
- Symptoms indicating a worn outer tie rod end:
- Excessive free play or looseness in steering wheel.
- Clunking or clicking when turning or going over bumps.
- Uneven or rapid tire wear on the front tires.
- Visible torn boot, grease leakage, or rusted/stiff joint.
- Inner tie rod symptoms:
- Play when you grasp the inner rod near the steering rack and wiggle.
- If any of above are present, replacement of the worn component is required. Failure to replace leads to unsafe steering and possible loss of control.
- Step-by-step replacement procedure (beginner-friendly)
- Prepare vehicle
- Chock rear wheels, loosen front wheel lug nuts slightly while wheels on ground.
- Jack vehicle at specified front lift point and support with jack stands. Remove front wheel.
- Inspect and mark
- Clean the tie rod area with wire brush.
- Count number of threads/turns on the outer tie rod end relative to the inner sleeve or mark the position with a scribe/marker — this helps roughly preserve toe alignment when installing the new end.
- Loosen jam nut
- Use a wrench to hold the inner tie rod or adjusting sleeve and another wrench on the jam nut and break it loose. Do not remove the jam nut yet.
- Loosen and remove the outer tie rod stud nut
- Remove the cotter pin if present (use pliers), then use the correct socket/wrench to remove the nut.
- If nut is seized, apply penetrating oil and let soak before attempting again.
- Separate tie rod end from steering knuckle
- Use a tie rod puller (threaded type recommended) and press the stud out of the steering knuckle. If using a pickle fork, be aware it will stress the rubber boot and may damage it.
- Once separated, remove the outer tie rod end by unscrewing it from the inner tie rod or sleeve. Count turns as you remove to match on install.
- Inspect inner tie rod and sleeve
- If inner threads or sleeve are damaged or loose, replace those components now.
- Install new outer tie rod end
- Screw the new outer tie rod end onto the inner rod/sleeve the same number of turns as the old one (or align your marks).
- Make sure the ball stud seats in the knuckle hole properly.
- Install new castle nut and torque to factory spec (use torque wrench). If a cotter pin is required, align nut slot with stud hole; if not possible, tighten slightly until aligned and insert a new cotter pin.
- Tighten jam nut against the outer tie rod end to lock the adjustment (if applicable).
- Grease (if applicable)
- If the new tie rod end has a grease zerk, use a grease gun to lubricate per manufacturer instructions.
- Reassemble wheel
- Reinstall wheel, hand-thread lug nuts, lower vehicle to ground, torque lug nuts to spec in a star pattern.
- Final checks
- Make sure cotter pin is properly bent and secured.
- Check that jam nut is tight.
- Check steering by turning wheel lock-to-lock carefully to ensure nothing binds.
- Start with a short, slow test drive and confirm steering feels firm and straight.
- Torque and specifications
- Consult the Jeep factory service manual or an OEM repair database for exact torque specs for your model/year.
- Typical guidance: outer tie rod stud nut is torqued to a specific value (commonly in the 40–80 ft·lb range on many vehicles) — do not guess; use the factory value.
- Post-replacement required work
- Wheel alignment (toe adjustment)
- Why: replacing tie rod end changes toe setting; a professional 4-wheel alignment is required to prevent tire wear and ensure safe handling.
- Recheck fasteners after 50–100 miles
- Why: ensure nothing has loosened and all components seat properly.
- Extra tools you might not have and why they’re recommended
- Tie rod puller (threaded)
- Why recommended: separates ball joint cleanly without damaging boots; faster and safer for beginners than hammer/pickle fork.
- Torque wrench
- Why recommended: ensures correct clamping force; prevents under- or over-tightening which can be dangerous.
- Impact wrench and impact sockets (optional)
- Why optional: speeds removal of stuck fasteners; be careful when reinstalling critical fasteners — always finish with a torque wrench.
- Alignment tools or double-check service (not a tool you’ll likely buy)
- Why required after replacement: proper toe/camber/sweep can only be set reliably with alignment equipment.
- Common beginner mistakes to avoid
- Working under the vehicle supported only by a jack.
- Forgetting to buy a new cotter pin or using the old one if bent/damaged.
- Not counting or marking threads before removal; leads to rough alignment and possible need to remove again for adjustment.
- Skipping the wheel alignment after replacement.
- Using a pickle fork casually (can damage the tie rod boot and surrounding components).
- Quick replacement parts checklist to buy before starting
- Outer tie rod end (correct side and part number for your Jeep)
- New cotter pins (sized to the stud)
- New castle nut (if recommended by parts supplier or factory)
- Grease (chassis grease) if needed
- Penetrating oil and rags
- Final note
- Replace worn tie rod components promptly and have a professional alignment performed immediately after. If at any stage fasteners are corroded, threads are damaged, or you’re unsure of correct torque values, stop and consult a repair manual or a qualified mechanic.
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The NV3550 is a medium-duty, 5-speed, constant mesh, fully synchronized manual transmission. The transmission is available in two and four-wheel drive configurations.
The Automatic Transmission 42RLE is a four-speed transmission that is a conventional hydraulic/mechanical assembly controlled with adaptive electronic controls and monitors.