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The 45RFE and 545RFE are the same basic transmission. The 545RFE simply uses the alternate second-gear ratio the 45RFE was designed around, giving it five forward speeds. That matters here because the filter, pan and service procedure are shared, and almost every kit sold for one fits the other. What does change is the drivetrain: 2WD and 4WD units use different primary filters, and getting that wrong is the most common mistake on this service.
An RFE pan drop is also the only real chance you get to look inside. There is no dipstick-level reading that tells you a clutch pack is shedding. The pan and the magnet will.
What Is Inside an RFE Filter Kit
| Part | Where It Lives | Notes |
|---|---|---|
| Primary (sump) filter | Pushes into the valve body pickup bore | Has an O-ring seal on the neck. 2WD and 4WD versions have different pickup heights to match the pan depth. |
| Secondary spin-on filter | Threads onto the valve body, inside the pan | Filters cooler return oil feeding lube. Only reachable with the pan off, so it gets skipped more than it should. |
| Pan seal | Pan rail | Factory sealed with RTV. Many kits include a reusable rubber gasket instead. |
| Pan (optional) | Bottom of case | Stamped steel replacement or a deeper cast aluminum pan with a drain plug. |
If a kit only lists a "filter" with no mention of the spin-on, assume it is primary-only and buy the secondary separately. Changing one and not the other leaves half the job undone.
2WD vs 4WD — Match the Pickup
2WD and 4WD units use different pan depths, and the primary filter pickup is sized to each pan. Put a 2WD filter in a 4WD pan (or the reverse) and you either bottom the filter against the pan or leave the pickup sitting too high. A pickup that is too high will suck air on hard braking, steep grades and cornering when the fluid sloshes away, and you get flares, delayed engagement and erratic shifts that look like a solenoid problem.
Before ordering, confirm 2WD or 4WD from the build sheet or the transfer case, not from a parts store lookup that only asks for the engine. Our 45RFE / 545RFE / 68RFE 4WD filter kit is the deep-pan 4WD version.
RTV vs Gasket
Chrysler sealed RFE pans with RTV from the factory. That works, but it means every service involves scraping both the pan rail and the case rail clean, and any leftover silicone that gets into the pan ends up in the new filter. A reusable rubber-coated gasket is cleaner and is what most shops switch to after the first service.
- If you stay with RTV, use an ATF-rated silicone and keep the bead thin and inboard of the bolt holes.
- If you switch to a gasket, the pan rail must be flat. Check the bolt holes for dimpling from a previous overtightening and flatten them on a block before reinstalling.
- Pan bolts are low torque, around 105 in-lb. Overtightening is how a steel pan rail gets distorted and starts weeping.
Stock Pan or Deep Aluminum Pan
A stamped steel replacement such as the 265-817 pan and filter kit is the right call when the original pan is rusted through at the rail, dented into the filter, or was gouged by a jack. It restores factory capacity and fit.
A cast aluminum deep pan like the 545RFE aluminum pan with magnetic drain plug makes sense if you tow or plan to keep the truck. Extra fluid volume lowers peak temperature, the fins shed heat, and the drain plug means the next service is a drain-and-fill instead of a full pan drop. On 4WD trucks check front driveshaft and crossmember clearance before you buy any deep pan.
What the Old Pan Is Telling You
- Fine gray paste on the magnet: normal wear. Wipe it and move on.
- Brass or bronze glitter: bushing or thrust washer wear. Common on high-mileage RFEs; note it and watch it at the next service.
- Steel chips or slivers: hard part damage, often a planetary or a snap ring. Plan for a teardown, not a fluid change.
- Friction material flakes and black fluid with a burnt smell: clutches are going. New fluid will not fix it and can make slipping more noticeable.
- Pieces of RTV: leftover from the last service. Clean them out and switch to a gasket.
If the pan shows hard-part damage, start with our 545RFE parts and 45RFE parts pages for rebuild kits and solenoid packs.
Refill and Level Check
RFE units take ATF+4 (MS-9602) only. A pan drop with both filters typically takes about 5 to 7 quarts depending on pan depth. Add most of that, start the engine, cycle through the gears with your foot on the brake, then set the level hot (about 180 F) in Park on level ground. The RFE dipstick tube is easy to overfill through; go slowly and recheck after a short drive. Overfilled RFEs foam and push fluid out the vent.
If you are dropping the pan anyway because of shift complaints, the solenoid pack is right there. Read the 45RFE / 545RFE solenoid pack guide before you button it up; our solenoid pack with filter kit covers both jobs in one pan drop.
45RFE / 545RFE Parts In Stock
Filter kits, steel and aluminum pans, solenoid packs and master rebuild kits for the RFE family, shipped from the USA.
Shop 545RFE Parts → Hard Parts at Core Transmission PartsFAQ
Do 45RFE and 545RFE use the same filter?
Yes. The primary and secondary filters are shared between the 45RFE and 545RFE, and many kits also fit the 65RFE and 68RFE. The split that matters is 2WD versus 4WD, which use different primary filter pickup heights.
How often should a 545RFE filter be changed?
Chrysler lists long intervals for normal use, but for towing, plowing or hot climates a filter and fluid service every 30,000 to 60,000 miles is the common shop recommendation. Change both the primary and the spin-on secondary filter each time.
Can I use a gasket instead of RTV on an RFE pan?
Yes. A reusable rubber-coated gasket works well as long as the pan rail is flat. Torque the bolts to about 105 in-lb and do not overtighten, or the rail distorts and leaks.
What fluid does the 45RFE and 545RFE take?
ATF+4 to Chrysler spec MS-9602. Expect roughly 5 to 7 quarts on a pan drop and set the final level hot, in Park, on level ground.