Next Level Performance
June 28, 2026 • 11 min read
If you own a 2007.5–2018 Ram 2500 or 3500 with the 6.7L Cummins, the right 68RFE transmission upgrades are the difference between a truck that tows for 300,000 miles and one that burns an overdrive clutch the first time you add a tune and a loaded trailer. The 68RFE is a stout 6-speed automatic, but the factory left line pressure too low and the torque converter too thin for the kind of power and weight these trucks routinely see. At NLP Performance in Tampa, FL, the 68RFE is one of the most common platforms diesel owners shop for, so we put together this buyer’s guide to the upgrades that actually move the needle — from a $410 plug-in module to a complete $8,460 built transmission and converter package, all in stock and fitment-verified for the 6.7L Cummins.
Our Verdict
The ATS Diesel 68RFE Billet Valve Body + Co-Pilot kit is the best all-around upgrade — it fixes the 68RFE’s two biggest weaknesses (low line pressure and a warp-prone cast valve body) without the cost or downtime of a full transmission swap.
For tuned daily drivers and trucks that tow regularly, the ATS billet valve body and Co-Pilot line-pressure controller raise clamping force up to roughly 270 psi and lock the converter earlier — the exact two changes that keep stock clutches alive. Running stock power on a healthy trans? Start with the $410 aFe Shift Logic module instead.
Shop Our Top Pick →What Is the 68RFE and Which Trucks Have It?
The 68RFE is a six-speed, fully electronic longitudinal automatic transmission built by Chrysler/Mopar and bolted behind the 6.7L Cummins inline-six in the Ram 2500 and 3500 (plus 4500/5500 chassis cab) from roughly the 2007.5 model year through 2018, and it continued on the 2019+ Standard-Output 2500. The “RFE” stands for Rear-wheel-drive Full Electronic. It uses three planetary gear sets and adaptive shift logic, with gear ratios of 3.23 (1st), 1.84 (2nd), 1.41 (3rd), 1.00 (4th/direct), 0.81 (5th overdrive) and 0.62 (6th deep overdrive), plus a 4.44 reverse.
It is important to know what you do not have: the High-Output 6.7L Cummins in the Ram 3500/4500/5500 uses the heavier Aisin AS69RC, not the 68RFE. If your truck is a 2500 or a Standard-Output 3500, you almost certainly have a 68RFE — and you are in the platform this guide covers. The factory unit is commonly rated around 750 lb-ft of input torque and runs on Mopar ATF+4, with a total fill of roughly 16 to 17.5 quarts (about 6 to 7 quarts on a standard pan-drop service).
68RFE Key Specifications
Why Does the 68RFE Need Upgrades?
The 68RFE’s weak points all trace back to one thing: not enough hydraulic line pressure to clamp its clutches under added power or weight. The 6.7L Cummins makes massive low-end torque — factory output climbed from about 350 hp and 650 lb-ft in 2007.5 to 385 hp and 865 lb-ft by 2018 — and even a mild tune pushes a stock 68RFE past its comfort zone. Stock units typically begin to slip above roughly 400 horsepower, and a tuned truck that tows can cook an overdrive clutch in short order. Here are the failure points the upgrades below are designed to solve:
- Overdrive clutch burn-up — the number-one mechanical failure. The thin OD clutch pack does not get enough apply pressure, so it slips, overheats and burns, especially while towing or tuned.
- Low factory line pressure — the root cause. The OE valve body simply does not command enough pressure to fully clamp the clutches, so nearly every failure path starts here.
- Valve body cross-leaks and separator-plate warpage — the cast channel plate warps and lets fluid bleed between circuits, causing sloppy shifts, lost pressure and the common P0871 overdrive-pressure code.
- Solenoid Switch Valve (SSV) bore wear — debris and wear in the SSV bore dump apply fluid back to the pan instead of the clutch, the classic weak link in the OD circuit.
- Torque converter shudder — a thin stock converter with limited clutch surface shudders under light throttle around 45–65 mph and overheats early.
- Input and output shafts — become the next weak link once power climbs; billet 300M shafts are recommended near 900 hp.
Line pressure is the 68RFE’s Achilles heel — nearly every upgrade targets it.
The Best 68RFE Transmission Upgrades, Tier by Tier
You do not have to jump straight to an $8,000 transmission. The smartest 68RFE strategy is to match the upgrade to your power level and how you use the truck. Below are five upgrades we stock, arranged from the cheapest reliability insurance to a complete bolt-in built unit.
1. aFe Power Shift Logic Module — Best Entry-Level Upgrade
The aFe Shift Logic is a plug-and-play inline module that taps the factory transmission connector and raises line pressure for firmer, faster shifts, less clutch slippage and lower fluid temperatures. With three selectable modes (Stock, Stage 1 and Stage 2), it is the cheapest way to extend the life of an otherwise healthy 68RFE and the right first step for stock-to-mildly-tuned trucks. It installs in under 30 minutes with no transmission disassembly, which is why it is our most popular entry-level pick at $410.
2. BD Diesel ProTect68 Gasket Plate Kit — Best Value Pressure Fix
The BD ProTect68 is a bonded billet-style separator-plate and gasket kit that eliminates the cross-leaks and P0871 codes caused by a warped factory channel plate. It seals reliably at up to 250 psi and delivers roughly 150% of stock torque-holding force, with a heavy-duty accumulator plate that stops blowout. The catch: to use that extra capacity you need a tuning module or controller (like the aFe Shift Logic or ATS Co-Pilot) commanding the higher line pressure, so it pairs naturally with the modules above and below it.
3. ATS Diesel 68RFE Billet Valve Body + Co-Pilot Kit — Our Top Pick
This is the upgrade we recommend most often because it attacks both root causes at once. The billet valve body replaces the warp-prone cast channel plate with a CNC-machined 6061 billet unit that stays flat under high pressure, and the ATS Co-Pilot is a plug-and-play controller that dynamically manages line pressure (closed-loop, up to roughly 270 psi), clutch timing and early torque-converter lockup — it can lock the converter as early as second gear and bypass the weak sprag under high torque. The result is a 68RFE that shifts crisply, runs cooler and survives serious tuning and towing — without pulling the transmission out for a full rebuild. At $3,687.52 (marked down from $4,274.99), it is the sweet spot between a $400 module and an $8,000 built unit.
What We Like
- + Fixes both root causes — low line pressure and the cast valve body
- + Up to ~270 psi closed-loop pressure and early converter lockup
- + No full transmission removal required; currently on sale
Things to Consider
- – Does not replace worn clutches in a high-mileage unit
- – Valve-body R&R is best handled by an experienced installer
A finned deep pan adds roughly 3 quarts of ATF+4 for extra cooling under load.
4. BD Diesel Deep Sump Trans Pan — Best Cooling Add-On
Heat kills automatic transmissions, and the 68RFE runs hot when you tow. The BD cast-aluminum finned deep pan adds about 3 quarts of fluid capacity and extra surface area for cooling, giving the trans more thermal mass to absorb load before temperatures spike. It is an inexpensive, bolt-on insurance policy that pairs with any of the upgrades above — we consider a deep pan and an auxiliary cooler the bare minimum for trucks that tow heavy in Florida heat.
5. BD Diesel 68RFE Transmission & Converter Packages — The Complete Build
When a 68RFE is already worn out, or you are building 600 to 800+ horsepower, a complete transmission and converter package is the answer. BD’s built units arrive with billet internals, an upgraded valve body, a heavy-duty overdrive drum, and a billet torque converter matched to the build — everything pre-assembled and ready to bolt in. The flagship $8,460.49 package is the no-compromise choice; for a slightly lighter-duty (but still heavy-tow-capable) build, the BD Transmission with Torq Force Converter package below comes in at $6,885.52.
68RFE Upgrade Comparison Chart
Here is how the five upgrades stack up side by side. Match the “Best For” column to your truck: stock power wants a module, tuned-and-towing wants the billet valve body, and a worn or high-horsepower unit wants a full built package.
| Kit | Upgrade Type | Capacity / Effect | Best For | Price |
|---|---|---|---|---|
| aFe Shift Logic Module | Line-pressure module | Firmer shifts, lower temps | Stock to mild, reliability | $410.00 |
| BD ProTect68 Gasket Plate Kit | Separator-plate kit | ~150% stock holding force | Stopping cross-leaks & P0871 | $194.85 |
| ATS Billet Valve Body + Co-PilotTop Pick | Billet VB + controller | Up to ~270 psi line pressure | Tuned & towing, no full rebuild | $3,687.52 |
| BD Deep Sump Trans Pan | Finned deep pan | +3 qt fluid, more cooling | Heat management while towing | $358.26 |
| BD 68RFE Trans & Converter Package | Full built trans + converter | Supports 600–800+ hp builds | Worn-out or high-power trucks | $8,460.49 |
How to Choose the Right 68RFE Upgrade
Start with two questions: how much power are you making, and how do you use the truck? A bone-stock 68RFE behind a stock 6.7L Cummins is fine for light duty — but the moment you add a tune, tow heavy, or notice converter shudder, you are living on borrowed time. For stock-to-mild trucks, the aFe Shift Logic module plus a deep pan is cheap insurance. For a tuned daily that tows, our top-pick ATS billet valve body and Co-Pilot combo solves the line-pressure and valve-body problems for good. And if the unit is already slipping or you are chasing 600+ horsepower, skip the band-aids and install a complete BD built transmission and converter package.
Converter stall speed matters too. For towing, you want a low- or enhanced-stall billet converter that locks early, uses the Cummins’ low-end torque and runs cooler — high-stall converters belong on race and sled-pull trucks, not loaded trailers. Whatever route you choose, match the transmission to the engine: adding horsepower without supporting line pressure, a billet valve body, and a stronger converter is the classic recipe for a burned overdrive clutch. Browse the full lineup in our Transmissions collection, or shop by brand with ATS Diesel and BD Diesel.
A three-mode line-pressure module is the cheapest reliability upgrade for a stock 68RFE.
Frequently Asked Questions
How much horsepower can a 68RFE handle?
A stock 68RFE reliably handles about 400 horsepower before it starts to slip. With line-pressure control and a billet valve body it can hold serious tuned power, and a full built unit with a billet converter supports roughly 600 to 800+ horsepower depending on the build stage.
What is the most common 68RFE problem?
The most common 68RFE failure is overdrive clutch burn-up caused by low factory line pressure. The clutch pack does not get enough apply pressure, so it slips, overheats and burns — especially when towing or running an engine tune. Raising line pressure is the fix.
Do I need a built 68RFE to tow?
Not for a stock truck pulling light loads, but heavy or frequent towing — and any engine tuning — makes a built or upgraded 68RFE worthwhile. At minimum, add a line-pressure module and deep pan; for tuned tow rigs, a billet valve body with a Co-Pilot controller is the smart move.
Why does my 68RFE shudder at highway speed?
A 45–65 mph light-throttle shudder on the 68RFE is classic torque-converter lockup-clutch wear. The thin stock converter has limited clutch surface and overheats, so the fix is an upgraded billet torque converter, often paired with a controller that manages lockup timing.
68RFE vs Aisin AS69RC — which is better?
The Aisin AS69RC is rated to roughly 1,000 lb-ft and is the better choice for maximum heavy hauling, which is why it sits behind the High-Output Cummins. The 68RFE is cheaper, lighter, and has far more affordable aftermarket support, making it excellent value once upgraded.
What fluid does a 68RFE take and how much?
The 68RFE requires Mopar ATF+4 full-synthetic automatic transmission fluid. A standard pan-drop service takes about 6 to 7 quarts, while a complete fill including the torque converter is roughly 16 to 17.5 quarts. A deep pan adds about 3 more quarts of capacity.
What does the ATS Co-Pilot actually do?
The ATS Co-Pilot is a plug-and-play controller that dynamically raises and manages 68RFE line pressure (closed-loop, up to about 270 psi), sharpens clutch timing, and locks the torque converter earlier — even as early as second gear — to keep clutches clamped under high torque while towing or tuned.
Which trucks came with the 68RFE?
The 68RFE was used behind the 6.7L Cummins in the Ram 2500 and 3500 (and 4500/5500 chassis cab) from about 2007.5 through 2018, and continued on the 2019+ Standard-Output 2500. The High-Output 6.7L Cummins uses the Aisin AS69RC instead.
Build a 68RFE That Won’t Quit
Shop in-stock 68RFE valve bodies, converters, deep pans, and complete built transmissions for your 6.7L Cummins at NLP Performance.
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