Overview
The TeraFlex 3990650 is an HD44 differential cover for Dana 44 axles, designed to give extreme protection from rocks, obstacles and other debris on the trail.
The cover is iron with a powder coated finish, and it is more than 3/8 inch thick. It is made for front and rear Dana 44 axle locations, with a standard oil capacity.
Key features
- Extreme protection from rocks, obstacles and trail debris
- More than 3/8 inch thick, per TeraFlex
- Iron construction with powder coated finish
- Fits front and rear Dana 44 axles
- Standard oil capacity
Choosing trail protection
A thick differential cover is one of the few armor pieces that sits low and takes direct hits from rocks and stumps. The iron body keeps debris out of the gears, but the mounting flange and bolts carry the load of each strike. A tough cover works best alongside a solid skid plate and a clean, undamaged housing flange.
When comparing covers, look beyond thickness to fit and sealing. Confirm the mounting bolt pattern, check whether a fill plug or breather sits in the cover, and plan for a new gasket. Clean the flange, torque bolts evenly, and recheck after the first hard trail day. Powder coating helps with corrosion, so touch up chips to keep bare metal from rusting.
- Check fill and breather placement before buying
- Keep the flange free of old gasket material
- Inspect the cover after rock strikes
- Recheck gear oil level after the first trail outing
Specifications
| Brand | TeraFlex |
|---|---|
| Part number | 3990650 |
| UPC | 843885002673 |
| Material | Iron |
| Thickness | More than 3/8 inch |
| Finish | Powder coated |
| Axle type | Dana 44 JK and Dana 44 |
| Axle location | Front and rear |
| Oil capacity | Standard capacity |
| Axle manufacturers | Dana and Jeep |
Vehicle fitment
It fits Dana 44 JK and Dana 44 axles. Confirm fit for your vehicle’s year, model and trim before ordering.
Confirm your vehicle’s year, model and trim before ordering.
What’s included
It is one differential cover. Gasket and fasteners are not part of the package, so plan for them before installing.
