Unless its rusted out you would be smart to pick up that truck. They are getting rare. As noted they came with 3.0L engines. They are part of the 6g7* family that includes 3.5 and 3.8L engines. All of which bolt to your V5MT1 4x4 transmission. There is another user on here, chargerx3, who has installed a 300hp 3.8L MIVEC into his and so far hasn't mentioned any issues.

Rear axles are the large 9" (similar to Ford 9") and all come with 4.22 gearing. They are VERY strong. I have yet to see anyone break one. Some come with Limited Slip Differential, but you can always swap one in if yours doesn't have it. Front suspension is independent and is an open differential. You can swap in a Starion rear differential to make that LSD as well.

To sum up, the 4x4 trucks are very stout. They will outlast any Toyota, or Isuzu, or most anything else out there. Just stay on top of your maintenance.