maintenance

Transmission Service

for 2007 Ram 3500 5.9L I6 Cummins · 4WD

Difficulty

Moderate

Time

1.7 h

Tools

Steps

✓Fact-checked. Built from OLP's spec database, then independently fact-checked line by line with every correction applied. Master-tech sign-off by Chris Hackleman is queued. Cross-check torque values against the factory manual, and stop if anything looks unsafe. How our data is made.

This procedure covers draining and refilling the transmission fluid, replacing the filter, and inspecting the pan gasket for the automatic or manual transmission.

Warnings

⚠Transmission fluid may be hot if vehicle was recently driven. Allow transmission to cool for at least 30 minutes before draining.

⚠ATF+4 is the only approved fluid for this transmission. Do not substitute with other ATF types as it will cause shifting issues and premature wear.

ℹ️This is a drain and fill service, not a complete flush. Approximately 5-7 quarts will drain from the pan; the torque converter retains remaining fluid.

ℹ️If transmission has never been serviced or has high mileage (150k+), consider having a professional evaluation before service as fresh fluid can sometimes dislodge deposits.

Tools required

Floor jack and jack standsEssential

Wheel chocksEssential

Drain pan (minimum 8 quart capacity)Essential

Socket set (metric and SAE)Essential

Torque wrenchEssential

Gasket scraper (plastic or soft metal)

Shop rags or towelsEssential

FunnelEssential

Rubber mallet

Brake cleaner or parts cleaner

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Parts

Transmission filter kit (includes filter and pickup tube O-ring) × 1 — Use OEM specification for 68RFE automatic or G56 manual
Transmission pan gasket × 1 — Use OEM specification
Transmission pan bolts (if corroded) × 1 — Use OEM specification

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Fluids

ATF+4 — 6 qt

Preparation

Park vehicle on level ground and engage parking brake
Place wheel chocks behind rear wheels
Start engine and allow to reach operating temperature, then shut off (warm fluid drains more completely)
Raise front of vehicle with floor jack and support securely on jack stands
Verify vehicle is stable before working underneath

Procedure

1
Locate transmission pan
Position yourself under the vehicle and locate the transmission pan. On the 68RFE automatic, the pan is rectangular and located mid-chassis. On the G56 manual, the pan is on the bottom of the transmission case. Verify you have adequate clearance to work and position drain pan underneath.
2
Drain transmission fluid
Loosen all pan bolts approximately 2-3 turns, but do not remove. Starting at one corner, carefully loosen bolts on that corner to allow fluid to begin draining into the catch pan. Gradually work around the pan, allowing fluid to drain slowly to avoid spills. Once fluid flow slows, remove remaining bolts while supporting the pan.
3
Remove transmission pan
Carefully lower the transmission pan, being aware that residual fluid will remain. Pour any remaining fluid from the pan into the drain pan. If pan is stuck, gently tap with rubber mallet to break gasket seal. Do not pry aggressively as this can damage sealing surfaces.
4
Inspect pan and magnet
Examine the pan interior and magnet for metal debris. A small amount of fine metallic dust is normal. Large metal particles, chunks, or excessive debris indicates internal transmission wear and should be evaluated by a professional. Clean the pan thoroughly with brake cleaner and shop rags.
5
Remove old transmission filter
Locate the transmission filter inside the transmission. The 68RFE uses a drop-in primary filter that pulls straight out of the valve body/pump bore, plus a separate bolt-in cooler-return (secondary) filter. Remove the primary filter by pulling it straight down; remove the secondary filter fasteners as required. Note orientation and position for new filter installation. (Note: The G56 manual transmission does not use a serviceable pan filter — for a G56, this is a drain-and-fill only.) Note the orientation and position for new filter installation.
6
Install new transmission filter
Install the new filter in the same orientation as the old one. For the 68RFE drop-in primary filter, lubricate the filter seal with clean ATF+4 and firmly seat it into the pump/valve body bore by hand until fully seated. For the bolt-in secondary (cooler return) filter, torque the retaining bolts to the OEM specification (approximately 40 in-lbs / 4.5 Nm) in a crisscross pattern — verify against factory service data before final tightening.
7
Clean gasket surfaces
Using a plastic gasket scraper, carefully remove all old gasket material from both the transmission pan and the transmission case mating surface. Take care not to gouge or scratch the aluminum surfaces. Clean both surfaces thoroughly with brake cleaner and wipe dry with lint-free shop rags. Inspect for damage or warping.
8
Install new pan gasket
Position the new gasket on the transmission pan, aligning all bolt holes. Some gaskets are adhesive-backed and will stick to the pan; others may require gasket adhesive at corners to hold in place during installation. Ensure gasket is properly seated in any locating grooves or channels.
9
Reinstall transmission pan
Carefully lift the pan with gasket into position, aligning all bolt holes. Start all pan bolts by hand to ensure proper threading. Tighten bolts in a crisscross pattern, working from center outward, to pull the pan up evenly. Make multiple passes, gradually increasing torque to avoid warping the pan. Final torque for the 68RFE pan bolts is approximately 8 ft-lbs (100-105 in-lbs) per OEM specification — verify against factory service data. Do not over-tighten, as this can warp the pan and cause leaks.
10
Refill transmission fluid
Lower vehicle to ground. Locate transmission dipstick (automatic) or fill plug (manual). For automatic: insert funnel into dipstick tube and add approximately the same volume of ATF+4 that was drained (typically 6-7 quarts on the 68RFE), adding in increments and checking level before topping off. For manual: remove fill plug on side of transmission case and fill until fluid reaches bottom of fill hole. Use only the OEM-specified G56 manual transmission fluid (Chrysler MS-9224 / Mopar manual transmission lubricant) — do NOT use ATF+4 in the G56.
11
Check fluid level and cycle transmission
For automatic transmission: start engine and allow to idle. With foot on brake, shift through all gear positions available on the selector (P-R-N-D), pausing 2-3 seconds in each position, then return to Park. Check dipstick with engine running and transmission at operating temperature. Add fluid in small increments until level reaches the 'HOT' range. For manual: verify fluid is at fill hole level with vehicle on level ground.

Reassembly

Verify no tools or rags were left under vehicle
Check for fluid leaks around transmission pan after initial startup
Road test vehicle through all gears to verify proper shifting
Recheck fluid level after test drive and top off if necessary

Verification

Check transmission fluid level on dipstick (automatic) or at fill plug (manual) - fluid should be in 'HOT' range when at operating temperature
Inspect under vehicle for any fluid leaks around transmission pan gasket
Verify smooth shifting through all gears with no slipping, delayed engagement, or harsh shifts
Monitor transmission temperature gauge (if equipped) to ensure normal operating temperature
Recheck fluid level after 50-100 miles of driving and adjust if necessary