If it was originally installed on a wrecker of that "vintage",it's probably substantial even if it needs rebuilding. That's around a '78 dodge.If it's like the older equipment I see around here, it will pick our rigs up to airborne as long as the battery holds up.

Va_Stumpy
89 Raider
"Never judge horsepower by exhaust"
3.0
automatic
stock as a rock
Dual Bouncy Seats