45RFE Rebuild Cost and What Drives It

The question lands on the counter every week: "What is it going to cost to rebuild my 45RFE?" It usually comes from someone with a Ram 1500, a Dakota, a Durango or a Grand Cherokee that has started flaring, slamming into gear, or dropping into limp mode. The straight answer is that no honest shop can quote a firm number before the unit is on the bench, because two 45RFEs with the same complaint can be hundreds of dollars apart on parts alone. One needs a clutch kit and a valve body clean-up. The other has an overdrive clutch that burned because the inner retainer is worn, a pump that lost pressure, and a converter full of lining material.

What we can do is walk through exactly what goes into a 45RFE rebuild bill, which parts are fixed on every job, which ones only show up when the truck was driven too long, and which inexpensive items decide whether you pay for the job twice. The clearances here come from the ATSG 45RFE manual, the fluid numbers from Chrysler's own capacity sheet, and the wear points from Sonnax, Gears Magazine and Transmission Digest. Sources are at the bottom.

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Recommended 45RFE parts

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45RFE Transmission Master Rebuild Kit, Dodge Ram/Jeep

$287.99View part

45RFE Input Drum

$139.99View part

45RFE Valve Body 1999-2009

$418.59View part

Why the 45RFE Bill Is Hard to Quote Blind

The 45RFE is not a band-and-servo transmission like the 46RE or 47RE it sits next to in the Chrysler lineup. It is a clutch-to-clutch design: three input clutches (underdrive, overdrive and reverse) in one input clutch assembly, and three holding clutches (2nd, 4th and low/reverse) in the case. The transmission controller runs every shift by timing one clutch off against another, and it tracks each clutch's wear with a Clutch Volume Index, or CVI. That design is why a 45RFE rebuild is priced a little differently from an older Mopar:

• There are six clutch packs to kit and set. Every one has its own clearance spec, and setting them takes select-fit snap rings or pressure plates and a dial indicator.
• The valve body and solenoid block are part of the hydraulic calibration. A worn bore in the valve body can burn a clutch just as fast as a worn friction.
• The controller has to relearn. A rebuilt unit needs its adaptives reset and a quick learn done, or it will shift like it did before.

The Fixed Cost: What Every 45RFE Rebuild Gets

Every real rebuild replaces the soft parts and wear parts: gaskets, seals, sealing rings, the pan seal, frictions, steels and both filters (the sump filter and the spin-on cooler return filter inside the pan). An overhaul kit covers the gaskets, seals and rings. A master kit adds frictions and steels, and usually a filter. For reference, our 45RFE master rebuild kit for Ram, Durango and Jeep applications is listed at $287.99, and year-specific overhaul kits run from about $196 to $413 depending on the years they cover.

The labor that belongs in the fixed-cost bucket is clearance setup. The ATSG manual lists these clutch clearances and the CVI range the controller expects for each pack:

• Low/Reverse: 1.14-1.91 mm (.045-.075 in.), CVI 82-134
• 2nd clutch: 0.53-1.27 mm (.021-.050 in.), CVI 25-64
• Overdrive: 1.01-1.65 mm (.040-.065 in.), CVI 30-64
• 4th clutch: 0.81-1.35 mm (.032-.053 in.), CVI 30-64
• Underdrive: 0.76-1.60 mm (.030-.063 in.), CVI 44-92
• Reverse: 0.81-1.24 mm (.032-.049 in.), not monitored by CVI

Output shaft end play is 0.22-0.55 mm (.009-.021 in.). ATSG also points out a trap when measuring input shaft end play: you feel two stops, and the first one is the shaft moving in the input clutch hub, which has to be subtracted from the reading. A shop that measures all of this is billing for time you want spent. A shop that stacks the new clutches in without checking is why some rebuilt 45RFEs come back with harsh shifts and CVIs out of range on the first scan.

Those are the early 45RFE numbers, and Chrysler revised them later in the run. Chrysler’s own 2007 RFE specification table lists input shaft end play at 0.46-0.89 mm (.018-.035 in.) and moves several packs, for example L/R at 1.00-1.74 mm (.039-.069 in.) and OD at 1.103-1.856 mm (.043-.073 in.), while reverse stays at .032-.049 in. (Chrysler 545RFE Specifications). Set the packs to the table for the year on the bench. Before it goes back in, Chrysler’s shop check is 30 psi of clean, dry air at each apply passage: a working clutch gives a soft thump and releases when the air comes off (Chrysler Air Checking Clutch Operation). The full later-year table, with ratios and torque values, is in our 45RFE gear ratios and specs reference.

Where the Bill Grows: Hard Parts

This is the part of the estimate nobody can give you over the phone. The hard parts that show up on 45RFE teardowns are well documented, and each is its own line item:

• Inner retainer housing (input clutch assembly). Gears Magazine and Sonnax describe RFE units as high risk for overdrive failure from clutch wear on the inner retainer housing. The aluminum wears, the clutches drag, and the overdrive clutch burns again after a rebuild that only replaced frictions. Sonnax offers a heavy duty kit (72554-01K, all new) and a remanufactured version using an OE retainer (72554-11K), both fitting 2007-later 45/545RFE. If the retainer is worn, that is a real added cost, and skipping it is how the unit comes back. Our 45RFE input drum is listed at $139.99.
• 4C return spring retaining ring. Transmission Digest reports the 4th clutch return spring retaining ring is known to come unseated and pop off, resulting in transmission failure. The Sonnax 72978-01K ring and shim kit costs little and belongs on the bench during every rebuild.
• Pump. Sonnax lists low pressure and pump gear damage as reasons for a remanufactured pump (CHR151-P without front seal, CHR150-PS with). A scored pump pocket or worn gears means a pump, not a seal kit. Our 45RFE pumps run from about $98 to $279 depending on year.
• Bearings and thrust. Sonnax's SBK-C17 bearing kit covers 1999-later units with bearing noise or failure, and an endplay kit (72030-REP) handles a washer stack that will not reach spec.
• Drums, planetaries and the low sprag. These are replaced only when damaged, and they are almost always damaged because the truck was driven after it started slipping.

The pattern holds on every model we rebuild. A 45RFE pulled at the first flare usually needs the fixed-cost parts and a retainer inspection. One that was driven until it would not move usually needs drums, a pump or a planetary on top of that.

The Valve Body and Solenoid Line

On an RFE, the valve body is where a lot of repeat failures start. The Sonnax vacuum test guide for the 45RFE, 545RFE, 65RFE, 66RFE and 68RFE lists the critical wear points and what they cause:

• Solenoid switch valve and plug: codes 841, 868, 871, 988, 1775 and 1776, bind-up, failsafe mode, wrong gear starts and a burned overdrive clutch. The OE large spool comes in .420 in. and .453 in. bores, so the repair kit has to match.
• Pressure regulator valve: high line pressure, burnt clutches and repeated converter failure.
• TC limit valve: engine stall, low cooler flow and an overheated converter.
• Accumulators: slide shifts, high CVIs, 1-2 shudder and coastdown clunk.

You have two paths. Rebuild the valve body with repair kits and a vacuum test, or swap in a remanufactured unit. Rebuilding in-house costs kits plus bench time with reamers. A replacement 45RFE valve body is listed in our store at $418.59 for 1999-2009 units. The mistake that costs money is buying the wrong year. Gears Magazine's RFE valve body interchange article notes the early units had seven check balls with a black case connector, later a white one, and that in 2009 Chrysler eliminated the overdrive solenoid along with the number 6 check ball and changed the connector color again. Match the valve body to the transmission, not just to the model name. Our 45RFE valve body testing guide covers the checks.

The solenoid block is a separate line. If the complaint was electrical, such as solenoid circuit codes or poor shift quality traced to the block, a replacement solenoid pack is cheaper than a second teardown. Sonnax lists a remanufactured block (44836A) for 45/545RFE units through 2018.

Converter, Cooler and Fluid

A failed 45RFE has almost always pushed debris into the converter and cooler. Bolting a rebuilt unit to that converter is a comeback waiting to happen, so budget for a converter on nearly every rebuild, plus a cooler flush. Sonnax also offers a thermal bypass eliminator kit (72760-01K) for overheating complaints tied to the cooler bypass valve, which is worth looking at on a truck that tows.

Fluid is a bigger line on a 45RFE than people expect. Chrysler's capacity sheet lists the 45RFE and 545RFE service fill at 5.20 L (11 pints) for 4x2 and 6.20 L (13 pints) for 4x4, but the overhaul fill is 14.0-16.0 L (29-33 pints), roughly 15 to 17 quarts, and it varies with the cooler and line length. The fluid has to be ATF+4 licensed to Chrysler MS-9602. Our 45RFE fluid guide has the fill procedure.

Reading a 45RFE Estimate

California's Bureau of Automotive Repair consumer guide spells out exactly what to expect on a transmission teardown, and it names transmission failure specifically as the kind of job that needs one: a written estimate before work begins, notice that the vehicle may not be able to be reassembled, and a cost that covers reassembly plus any gaskets or seals destroyed in the teardown. Ask the shop to call for approval before doing anything beyond that estimate. Ask for your old parts back before the work starts, since a shop only has to return them if you request it up front. Get the warranty in writing and find out whether it covers parts only or parts and labor. Know the difference between a rebuilt transmission, where the shop replaces what it finds worn, and a remanufactured one built to a standard.

For a 45RFE specifically, a good estimate answers these:

1. Is it an overhaul kit or a master kit with frictions and steels?
2. Was the inner retainer housing inspected, and is it being replaced or upgraded?
3. Is the 4C retaining ring being addressed?
4. Is the valve body vacuum tested and repaired, or replaced? Is it the correct year and connector?
5. Is the converter replaced and the cooler flushed?
6. Were clutch clearances measured, and will the controller get a quick learn with CVIs checked?

Keeping the Cost Down Without Cutting Corners

• Pull it early. The biggest cost driver is miles driven after the first flare.
• Diagnose before teardown. Harsh shifts, shudder and limp mode can be a solenoid block, valve body or wiring problem. Our 45RFE limp mode guide and slipping guide walk through it.
• Buy the kit that matches the job. An overhaul kit on a unit that needs frictions is false economy.
• Fix the known weak points while it is apart. A retainer kit and a 4C ring kit cost far less now than after a second overdrive clutch failure.
• Protect it afterward. Keep the cooler clear, run licensed ATF+4, and watch the CVIs at each service.

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Frequently Asked Questions

How much does it cost to rebuild a 45RFE transmission?

It depends on what is broken inside. A core that only needs gaskets, seals, frictions, steels and filters is the low end. Add an inner retainer housing, pump, valve body, drums or a torque converter and the parts side can double or more. Labor for removal, teardown, rebuild, setup and install is the other big line, so get a written estimate that separates parts from labor.

Is it cheaper to rebuild or replace a 45RFE?

Rebuilding is usually cheaper when the case, drums and planetaries are reusable and the failure was caught early. Once the truck has been driven slipping and the hard parts are scored or broken, a remanufactured unit can cost about the same and comes with its own warranty. The teardown decides which side of that line the transmission is on.

Why do rebuilt 45RFEs burn the overdrive clutch again?

The two common causes are clutch wear on the aluminum inner retainer housing, which makes the overdrive clutch drag, and a worn solenoid switch valve bore in the valve body. Gears Magazine and Sonnax both document the retainer wear, and Sonnax ties switch valve wear to a burned overdrive clutch. New frictions alone do not fix either one.

How much fluid does a rebuilt 45RFE take?

Chrysler lists the overhaul fill at 14.0-16.0 liters, or 29-33 pints, which is roughly 15 to 17 quarts, and it varies with the cooler and line length. A routine pan service is only 5.20 liters on 4x2 and 6.20 liters on 4x4. Use ATF+4 licensed to Chrysler MS-9602 and set the level hot.

Can I use any 45RFE valve body during a rebuild?

No. The valve body changed over the years. Early units used seven check balls with a black case connector, later a white one, and in 2009 Chrysler eliminated the overdrive solenoid and the number 6 check ball and changed the connector again. Match the valve body to the year and connector of the transmission.