45RFE Pan Bolt Torque Spec and Service: 105 In-Lb and the Rest of the Job

The 45RFE pan is one of the easiest jobs on the truck and one of the easiest to get wrong. The most common mistake I see is not the sealant or the filter. It is somebody reading "105" off a spec sheet, grabbing a 3/8 click wrench set in foot-pounds, and pulling the pan bolts to twelve times the spec. The pan rail bows between the bolts, the RTV squeezes out, and the truck is back in a month with a wet crossmember.

This guide covers the factory torque for every fastener you touch during a 45RFE or 545RFE pan and filter service, how Chrysler wants the pan sealed, the filter install detail that ruins pumps when it is skipped, and how to set the level afterward. The torque figures come from Chrysler's 45RFE/545RFE specification table, the sealing procedure from an FCA service bulletin, and the capacities from Chrysler's own capacity charts. The full source list is at the bottom.

A little background explains why the specs look the way they do. MOTOR magazine's June 2000 introduction to the unit explains that RFE stands for Rear wheel drive, Full Electronic control, and that the 45RFE operates much like Chrysler's front-drive 41TE and 42LE transaxles rather than the hydraulic Torqueflites it replaced. Like those units, it relies on clean, correctly filtered fluid and accurate pressure readings, and that is where most of the small fasteners on this list come from.

Recommended 45RFE parts

Everything for a 45RFE pan job: a replacement pan with sump filter, gasket and spin-on cooler filter for a bent or rusted pan, a filter kit if your pan is good, and ATF+4 for the refill. Ships from the USA, secure checkout.

545RFE Transmission Oil Pan and Filter Kit, 265-817

$84.99View part

45RFE 545RFE 65RFE 68RFE Transmission Filter Kit, 4WD

$30.99View part

Castrol Transmax ATF+4 Full Synthetic ATF 1qt, Case of 6

$59.99View part

The Number: 105 Inch-Pounds, Not Foot-Pounds

Chrysler's specification for the 45RFE/545RFE oil pan bolts is 12 N·m, or 105 in-lb. That works out to about 8.75 ft-lb. FCA repeats the same 12 N·m (105 in-lb) figure in service bulletin 21-024-17, its pan reseal procedure for the 68RFE, which shares the RFE family's pan sealing design. So the number is consistent across the family, and it is small.

A pan bolt spec that low exists because the pan is stamped steel and the seal is a bead of RTV, not a thick cork gasket that needs crush. You are clamping two flat surfaces together with a thin layer of silicone between them. Once the bolt is snug and the flange is flat, more torque does nothing for the seal. It just dimples the pan around each bolt hole and lifts the flange between the bolts, which is exactly where the leak starts.

Use a 1/4-inch drive torque wrench that reads in inch-pounds. Run the bolts in by hand until they bottom, then snug them lightly in a crisscross pattern from the middle of the pan outward, then make a final pass at 105 in-lb in the same pattern. If you only own a foot-pound wrench, most 3/8 click wrenches are not accurate at the bottom of their range, and 9 ft-lb is right at that bottom. Borrow the right tool.

Full Torque Chart for a 45RFE Pan and Filter Service

These are the fasteners you are likely to touch with the pan down or while you are under there checking for leaks. All values are from Chrysler's 45RFE/545RFE specification table. Notice how many of them are in inch-pounds.

Two on that list get over-tightened more than the pan. The first is the spin-on cooler return filter. It is 84 in-lb, about 7 ft-lb, which is barely past what most people do by hand. Do not put a strap wrench on it and crank. The second is the pressure test port plugs at 45 in-lb. They thread into the aluminum case. Strip one and you are installing a thread insert in the truck.

Dropping the Pan Without a Bath

Unless someone has already fitted an aftermarket pan with a drain plug, the fluid comes out when the pan does. FCA's bulletin procedure is the cleanest way to do it: remove the pan bolts, slowly separate the front of the pan from the case so the fluid drains out that edge into your drain pan, then hold the pan level as you lower it and pour the rest out. In practice I take all the bolts out except two at the rear corners, back those two out a few turns, and pry the front down gently. Pry at the corners, not the middle of the flange, or you bend the rail you are about to seal.

Do not reuse the old fluid. Plan on roughly the service fill amount going back in, and plan on the level check doing the final work.

Read the Pan Before You Clean It

Before anything goes in the parts washer, look at what is in the bottom of the pan and on the magnet. Chrysler's guidance is specific: a light coating of clutch material on the bottom of the pan does not indicate a problem unless it comes with a slipping condition or shift lag. Excessive metal on the magnet or heavy debris in the pan means you stop the service and go to diagnosis.

What that looks like on the bench:

• Fine gray paste on the magnet, light brown haze in the pan: normal wear. Clean it and move on.
• Visible friction flakes or black grit you can feel between your fingers: a clutch pack is going away. Ask the driver about flare on the 2-3 or a slipping complaint before you button it up.
• Bright metal slivers or chips: hard part damage. A filter change will not fix it, and a fresh filter can actually make it worse by removing the restriction that was hiding low pressure.

This is also the time to check the pan flange. Lay a straightedge across each side of the rail. If the bolt holes are dimpled downward from a previous over-torque, flatten them on a block with a hammer and a socket, or replace the pan. RTV will not bridge a bent rail for long.

The Filter Seal Detail That Kills Pumps

The 45RFE has two filters. Chrysler describes the design as dual filters: the customary main sump filter, plus a cooler return filter added to protect the pump and other components. The sump filter is the one under the pan. The cooler return filter is the spin-on canister on the side of the case.

The sump filter neck seals into the oil pump body with a separate seal, and this is where people get hurt. Chrysler puts it in a caution: the primary oil filter seal must be fully installed flush against the oil pump body, and you must not install the seal onto the filter neck and push the two in as an assembly. Chrysler states plainly that damage to the transmission will result.

The reason is simple. If the seal rides in on the filter neck, it can cock, roll or stop short of its bore. Now the pump is pulling air past the seal along with fluid. Aerated fluid means low, slow-building pressure, which means slipping clutches and heat. So pull the old seal out of the pump body, make sure it actually came out (they like to stay behind), drive the new seal in flush with a socket that matches its outer diameter, and then push the filter neck into it. Torque the filter screw to 40 in-lb.

That pump matters more on this unit than on an older Torqueflite. In the SAE paper that introduced the 45RFE (SAE 1999-01-0755), DaimlerChrysler's engineers describe a transmission with no shift valves at all. Every friction element is applied by high-flow electro-hydraulic solenoid valves, line pressure is controlled based on torque, and the pump is a two-stage design with an independent lubrication feed. When every clutch apply depends on solenoid-fed pump pressure, a filter seal that lets the pump pull air shows up in every shift.

If you are also changing the spin-on cooler return filter, lube the new gasket with clean ATF+4, thread it on until the gasket touches, and finish at 84 in-lb.

Sealing the Pan the Way FCA Does It

The RFE family pan seals with RTV from the factory. FCA bulletin 21-024-17 lists Mopar RTV sealant, part number 05010884AD, for the pan reseal and notes that one tube covers three vehicles. That tells you how much they expect you to use: a bead, not a tube per truck. The procedure in the bulletin is:

1. Use a gasket scraper to clean all original sealing material from both the transmission case and the pan.
2. Lay a bead of the Mopar RTV onto the pan sealing surface.
3. Set the pan in position and install the bolts.
4. Tighten the pan bolts to 12 N·m (105 in-lb).
5. Fill with Mopar ATF+4 to the proper level, start the vehicle and check for leaks.

A few shop details the bulletin does not spell out. Clean the case rail with a plastic scraper or a soft pad. The case is aluminum, and a gouge across the rail is a permanent leak path. Get the oil off both surfaces with brake cleaner and let them dry, because RTV will not bond to a film of ATF. Run the bead around the inside of each bolt hole so the sealant does not squeeze into the threads. Check the date on the tube. Old RTV skins over slowly and may never cure properly in the joint.

Reusable rubber pan gaskets are sold for this pan, and a lot of aftermarket kits include one. If you go that route, follow the gasket maker's instructions on whether to add sealant. Either way the pan bolts still go to 105 in-lb. A rubber gasket over-tightened just squeezes out from under the flange the same way RTV does.

Fluid, Capacity and the Level Check

The fluid is Mopar ATF+4 (Chrysler material standard MS-9602) or a licensed ATF+4. Chrysler's service information says Dexron II is not recommended and that clutch chatter can result from improper fluid. It also says to add nothing else. Chrysler strongly recommends against additives that claim to improve shift feel or stop leaks, with leak-detection dye as the only exception, and says transmission sealers should be avoided because they may adversely affect seal integrity.

Chrysler's capacity chart for the 45RFE and 545RFE lists the service fill at 5.2 L (11 pints) for 4x2 and 6.2 L (13 pints) for 4x4. That is a pan-and-filter service, not a full drain. The torque converter keeps most of the fluid. A dry overhaul fill is listed at 13.33 L (28 pints) on the 545RFE, and Chrysler notes it varies with the cooler, cooler line length and any auxiliary cooler. Treat every capacity number as a starting point. The dipstick is the final word.

Chrysler's level check procedure:

• Vehicle on level ground, selector in Park, engine idling for at least one minute.
• At normal operating temperature, about 82°C (180°F), the level is correct in the HOT cross-hatched region of the dipstick.
• At about 70°F fluid temperature, the level will sit near the upper COLD hole.
• After adding fluid, wait at least 2 minutes for it to drain down the fill tube before you recheck.
• True transmission temperature can only be read on a scan tool with the selector in Reverse or a forward gear.

That last point matters. Do not guess at "warm." Put a scan tool on it, read the transmission temperature PID in gear, then shift to Park and check the stick. My routine after a pan job: put in the service fill, start it, run it through the gears with your foot on the brake, top up to the COLD mark, road test until the scan tool shows about 180°F, then set the level in the HOT band.

Do not overfill to be safe. Chrysler explains that too much fluid lets the gear train churn it into foam, which causes the same low-pressure problems as low fluid, and the foam can push fluid out of the vent where it looks like a leak. Low fluid does the same damage from the other direction: the pump pulls air, pressure builds slowly, and the result is overheating, oxidized fluid and varnish.

After the Job: What a Good Pan Service Looks Like

• Dry pan rail after a 20-minute road test and an overnight sit.
• Level in the HOT band at about 180°F, checked in Park after one minute at idle.
• No new codes, and normal engagement into Drive and Reverse. If you get delayed engagement right after a filter change, suspect the filter seal first.
• Cooler line fittings and the spin-on filter dry. Those drip onto the pan rail and get blamed on your RTV.

If the pan leaks again after a proper reseal, look up before you look at the pan. Chrysler's leak paths on this unit include the cooler line fittings, the speed and line pressure sensor O-rings and the shift shaft seal, and all of them can run down to the lowest point of the pan. Our 45RFE leak guide walks through each one.

Related guides

• 545RFE Filter and Pan Service
• 45RFE Fluid Type and Capacity
• 45RFE Fluid Leak: Common Spots and Fixes
• 45RFE Delayed Engagement Fix
• 545RFE Overheating Prevention

FAQ

What is the torque spec for 45RFE pan bolts?

Chrysler specifies 12 N-m, or 105 inch-pounds, for the 45RFE and 545RFE oil pan bolts. That is about 8.75 foot-pounds. Use an inch-pound torque wrench and tighten in a crisscross pattern from the middle out.

Does the 45RFE use a pan gasket or RTV?

The RFE family pan seals with RTV from the factory. FCA bulletin 21-024-17 calls for Mopar RTV part 05010884AD applied as a bead on the pan after both surfaces are scraped clean. Aftermarket rubber gaskets exist, but the pan bolts still go to 105 in-lb either way.

How much fluid does a 45RFE take after a pan and filter change?

Chrysler lists the 45RFE and 545RFE service fill at 5.2 L (11 pints) for 4x2 and 6.2 L (13 pints) for 4x4. Treat that as a starting point and set the final level hot, in Park, at about 180 degrees F.

What is the torque on the 45RFE spin-on cooler return filter?

Chrysler specifies 9.5 N-m, or 84 inch-pounds, for the cooler return filter. That is only about 7 foot-pounds, so lube the gasket with ATF+4, spin it on until it touches and finish lightly.

Why does my 45RFE have delayed engagement after a filter change?

The most common cause is the primary filter seal. Chrysler warns that the seal must be installed flush in the oil pump body first, not on the filter neck, or transmission damage will result. A cocked seal lets the pump draw air, which gives low, slow-building pressure. Low fluid level does the same thing, so check the level hot as well.