There will be a code on the vin plate. Probably has a 5.14

The 4.10/1 will be a good all round gear ratio. You can besides the truck’s data plate look the axle up based on its Dana Bill of Materials (BOM) code to tell if it’s an open differential or a Powr-Lok. The BOM is I believe stamped on the right side axle tube.

https://therangerstation.com/tech_li..._1967-1978.pdf

Also, I think you’ll find that the front wheels are not original to the truck. They have a shallow SRW offset and sit too far out into the wheel wells. Stu

drug out the pressure washer and degreased the frame and engine this weekend.

question. I talked with a local engine machine shop, for about 1,700 - $2,000 not including parts they will completely go through the 239 and put new rings, valves gaskets and rebuild the carb. I think the rebuild kit is about $1200. Is this a good investment? I’ve never tore an engine apart before. He also said he could do whatever I couldn’t or didn’t feel comfortable doing myself.