2020 Ram 2500: Transmission & Axle Gear Ratios
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
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Transmission Gear Ratios
The 2020 Ram 2500 comes with two available transmissions, an 8-speed automatic for the gas engine and a 6-speed automatic for the diesel.
8HP75-LCV 8-Speed Automatic (6.4L HEMI V8)
| Gear | Ratio |
|---|---|
| 1st | 4.71:1 |
| 2nd | 3.14:1 |
| 3rd | 2.10:1 |
| 4th | 1.67:1 |
| 5th | 1.29:1 |
| 6th | 1.00:1 |
| 7th | 0.84:1 |
| 8th | 0.67:1 |
| Reverse | 3.30:1 |
68RFE 6-Speed Automatic (6.7L Cummins Turbo Diesel)
| Gear | Ratio |
|---|---|
| 1st | 3.23:1 |
| 2nd | 1.84:1 |
| 3rd | 1.41:1 |
| 4th | 1.00:1 |
| 5th | 0.82:1 |
| 6th | 0.63:1 |
| Reverse | 4.44:1 |
Available Axle Ratios
| Ratio | Available With | Axle Code | Best For |
|---|---|---|---|
| 3.73:1 | Standard with 6.4L HEMI V8 & 6.7L Cummins | DMM | Balanced |
| 4.10:1 | Optional with 6.4L HEMI V8 & 6.7L Cummins | DMH | Towing |
How to Identify Your Axle Ratio
There are a few ways to determine the axle ratio in your 2020 Ram 2500.
- VIN Decoder: You can use a VIN decoder to get a full build sheet for your truck, which will include the axle ratio.
- Axle Tag: Look for a tag on the differential housing. It will have the ratio stamped on it (e.g., 3 73 for a 3.73:1 ratio).
- Window Sticker: If you have the original window sticker, the axle ratio will be listed under the optional equipment section.
Towing vs. MPG Impact
The axle ratio has a significant impact on both towing performance and fuel economy.
- Numerically Lower Ratios (e.g., 3.73): These are better for fuel economy as the engine turns at a lower RPM at highway speeds.
- Numerically Higher Ratios (e.g., 4.10): These are better for towing as they provide more torque to the wheels, making it easier to get a heavy load moving.
Common Issues
While the 2020 Ram 2500 is a reliable truck, there are a few common issues to be aware of related to the driveline.
- Ring & Pinion Whine: A whining noise from the rear differential can indicate a problem with the ring and pinion gears. This is often caused by improper backlash or wear.
- Carrier Bearing Failure: The carrier bearings support the differential carrier. If they fail, you may hear a rumbling or grinding noise from the rear end.
- Limited-Slip Clutch Wear: On trucks equipped with a limited-slip differential, the clutches can wear out over time, leading to reduced traction.
Find a driveline shop on Repairius.
More specs for the 2020 Ram 2500
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2020 Ram 2500 Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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