'89 Chevy S-10 Rear End

I've got a replacement rear end from the "yard", but it has 2 electrical wire plugs coming out of it. Does anyone know what these are all about?
Stumped

Sounds to me some one may have had temp sensor on it.

No. I actually got a mechanics manual for this truck and found out that Chevy put a first generation, rear wheel ABS system on these trucks. It's controlled by a ECU system located next to the master cylinder in the engine compartment. The electrical connections are sensors from the rear wheels to the ECU. Thanks, anyway.