* Frame Differences: The 2WD and 4WD Blazer frames are significantly different. The 4WD frame has reinforcements and mounting points for the transfer case, driveshafts, front differential, and suspension components that are completely absent in the 2WD frame. You're essentially talking about a major frame modification or even a frame swap, requiring significant welding and fabrication skills.
* Drivetrain Components: You'll need a complete 4WD drivetrain, including:
* Front differential and axle assembly
* Transfer case
* Driveshafts (front and rear)
* Front suspension components (different control arms, knuckles, etc.)
* Possibly a different transmission (depending on the year and model)
Sourcing these parts, especially for older Blazers, can be challenging and expensive. Finding parts in good condition is also crucial.
* Wiring and Electronics: The 4WD system requires additional wiring for the transfer case, front differential, and possibly other 4WD-specific features. This involves significant electrical work and potential issues with compatibility.
* Suspension and Steering: The 4WD suspension geometry is different than the 2WD setup. You'll likely need to modify or replace the suspension components to accommodate the 4WD system. Steering components might also need adjustments.
* Labor: Even if you have all the parts, the labor involved in this conversion is immense. It requires advanced mechanical and fabrication skills, including welding, cutting, and precise alignment work. Professional shops would likely charge a substantial amount for this level of modification.
In summary: While theoretically possible, converting a 2WD Blazer to 4WD is a hugely complex undertaking that requires extensive mechanical knowledge, specialized tools, and a significant financial investment. It's generally much more cost-effective and less time-consuming to simply buy a 4WD Blazer. The cost of parts, labor, and potential unforeseen complications could easily exceed the value of the vehicle.
