Product Description
CPP Extreme-ER G56 Transmission with HD Case for 2005–2018 Dodge Ram 2500/3500
- Extreme-ER = Extreme Duty internals + Heavy-Duty Main Case
- HD case fights flexing & cracking under towing and heat
- Upgraded/hardened gears and precision-set clearances
- Direct fit for 2005–2018 Ram 2500/3500 (2WD/4WD)
- 3-year, unlimited-miles craftsmanship warranty
Built to work harder. The CPP Extreme-ER G56 pairs our Extreme Duty 6-speed build with a heavy-duty main case to reduce housing flex and help prevent crack-prone failures in high-load service. Every unit is assembled with premium components, verified to tight tolerances, and road-tested for shift quality before shipping.
Why Choose the Extreme-ER Over Standard Rebuilds
- HD Main Case: Reinforced housing helps control gear/shaft alignment under load, reducing case stress over time.
- Upgraded wear items: Bearings, synchros, and seals chosen for diesel duty and longevity.
- Direct fitment: Year-/drivetrain-correct (2WD/4WD) with matched top cover and shifter.
- Quality you can verify: Documented build sheet and end-of-line checks (runout, endplay, shift quality).
- Real warranty: 3-year, unlimited-miles craftsmanship coverage from CPP.
- USA assembly & testing
- Phone tech support from diesel specialists
- Core pickup & freight options available
Vehicle Fitment
Designed for 2005–2018 Dodge Ram 2500/3500 equipped with the G56 manual transmission. Choose your year and 2WD/4WD configuration at checkout.
What’s Included
- Fully built G56 Extreme-ER transmission
- Heavy-Duty Main Case pre-installed
- Matched shifter/top cover
- Fill & break-in guide
- Core return instructions
Recommended Supporting Parts
Finish the install right and protect your investment:
- G56 clutch kits for towing/power: (Shop G56 Clutches)
- Hydraulics: Pre-bled master/slave or slave-only (choose by year). (G56 Slave Cylinder)
- HD/Main Case (reference part): For tech details on the heavy-duty case design. (G56 Heavy-Duty Main Case)
- Bearing/Seal & small parts: Ideal when refreshing related components or spares. (07.5–12 G56 Parts | 13–18 G56 Parts)
Compare Your Options
| Feature | Factory G56 (Used/Core) | CPP Extreme Duty | CPP Extreme-ER (HD Case) |
|---|---|---|---|
| Main Case | Standard OE case | Standard case | Heavy-Duty main case to reduce flex/cracking |
| Internals | OEM, unknown wear | Upgraded/hardened selections | Same upgraded/hardened gears as Extreme Duty |
| QC & Testing | None | Runout/endplay/shift checks + build sheet | Runout/endplay/shift checks + build sheet |
| Best For | Light use | Towing & tuned diesels | Maximum durability under load/heat |
Options & Specs
- Configuration: 2WD or 4WD
- Matched top cover/shifter: We supply the correct parts for your year
- Built for diesel duty: Gearsets and wear items chosen for Cummins torque
Shipping & Core
We offer flexible freight options and core handling. Choose to ship your core first or add a refundable core charge to speed up delivery. Core return instructions are included.
Warranty Information
5 YEAR UNLIMITED MILESProduct Videos
Custom Field
Product Reviews
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So bad azz!
Now I can finally see what this truck has without breaking transmissions every month. Thanks CPP!
