Nate,
Check your friends door post serial number to confirm the rating. If it starts with 5C it's a 2 ton (19,000 gvw), 5F it's a Heavy Duty 1-1/2 ton (15,000 gvw) and if it's 5J it's a Heavy Duty 2 ton (21,000 gvw).
All 55-59 LCF trucks had V8's, the I6 is to long to fit under the hood.
Mike B
