Bottom line up front: Both the 8HP70 and 8HP90 are 8‑speed automatic transmissions found in the Dodge Charger, but the 8HP90 can handle more torque, shifts a touch quicker, and is usually paired with the higher‑output V8 engines.
Dodge Charger 8HP70 vs 8HP90: Key Differences Explained
Image: Dodge Charger 8HP70 vs 8HP90: Key Differences Explained – Performance Comparison and Specifications
Design & Looks
The two units look almost identical from the outside, yet their internal gear sets differ. The 8HP70 is built for up to about 500 Nm of torque, while the 8HP90 is reinforced to cope with roughly 650 Nm. Because of the extra strength, the 8HP90 is a little heavier and uses a stronger clutch pack. Visually, you won’t notice the change unless you peek under the car.
Performance & Mileage
Because the 8HP90 can tolerate more torque, it’s the go‑to choice for the Charger’s 5.7‑liter HEMI V8 and the newer 6.4‑liter supercharged V8. Those engines get faster 0‑60 times, especially when the transmission shifts in under 300 ms. The 8HP70, paired with the 3.6‑liter V6 or the base 5.7‑liter HEMI, still offers smooth shifts, but the slight lag can add a tenth of a second to acceleration runs.
Fuel economy stays close because both are 8‑speed units that keep the engine in its sweet spot. EPA estimates for a V6 Charger with the 8HP70 sit around 22 mpg city / 31 mpg highway, while a V8 Charger with the 8HP90 averages 18 mpg city / 27 mpg highway. The difference is more about the engine than the transmission.
Price & Rivals
Dealers usually price the 8HP90 a few thousand dollars higher because it’s a premium option. A base Charger with the 8HP70 starts near $30,000, whereas a V8 model with the 8HP90 can climb past $45,000 after options.
When you compare it to rivals, the 8HP90 gives the Charger an edge over the Chevrolet Camaro’s 10‑speed and the Ford Mustang’s 10‑speed, especially in how quickly it locks up for launch. The 8HP70, meanwhile, competes well with the midsize sedan crowd that prioritizes comfort over outright speed.
| Transmission | Engine | Mileage (city/hwy) | Starting Price | Top Features |
|---|---|---|---|---|
| 8HP70 | 3.6 L V6 or 5.7 L HEMI V8 | 22 mpg / 31 mpg (V6) – 19 mpg / 28 mpg (V8) | ≈ $30,000 |
|
| 8HP90 | 5.7 L HEMI V8 or 6.4 L supercharged V8 | 18 mpg / 27 mpg | ≈ $45,000 |
|
FAQ
What is the main difference in torque capacity between the 8HP70 and 8HP90?
The 8HP70 handles up to about 500 Nm, while the 8HP90 is rated for roughly 650 Nm, letting it support larger V8 engines.
Does the 8HP90 improve fuel economy compared to the 8HP70?
No. Fuel economy is more a factor of the engine it’s paired with. The 8HP90 usually sits behind bigger V8s, so its mpg numbers are slightly lower.
Is the price gap between the two transmissions worth it for daily driving?
If you drive a V6 or a modest V8 and value lower cost, the 8HP70 is sufficient. For performance enthusiasts who want the fastest launches and plan to use the high‑output V8, the 8HP90’s extra expense makes sense.
What do you think about the 8HP70 vs 8HP90 debate? Share your thoughts in the comments below.
Source: Read Official News
