Recently bought a 86 dodge D150 extended cab 318 5.2. It has a few issues and i need help on what they are. First off there is a leak under about where the cab is not sure what its from. Next the ac doesn't work it blows but not cold. The speedometer when i hit about 25ish starts shaking and makes a rattling noise until i hit about 50. If you can help figure out what the problems are/how i can fix them let me know. Also any websites for me to get parts for my truck.

What kind of leak is it fuel, oil, transmission fluid or just water? as far as the A/C probably leaked out the refrigerant over the years. Your speedo issue sounds like lack of lubrication in the cable assembly not not 100% positive. Best place I've found for replacement parts is Rockauto, if you need to do bodywork c2cfabrication.comI havent ordered from them yet so i cant vouch for them but plan on it when I do my rusty wheel arches. Welcome to the forum!

The leak is coming from t he oil pan I believe. And thanks

if it coming from the oil pan then the crank shaft seal is most likely worn out and leaking. could also check your valve cover gaskets since if they leaked it would most likely show up at the back.

when you turn the a/c on does the heater control valve on the heater hose move?

does the truck have cruise control? if so it might be a bit harder to locate speedo cable. rock auto is usually a good place to order parts if you need them. just have to try getting everything shipped from 1 location to save money.

i have dealt with c2cfabrication.com. there customer service is ok. about a month ago i ordered floor pans from them. i think they sell the same cheap body parts that most other places offer but at a fraction of the price. i know i had to cut a fair bit of metal off to make the one floor pan fit. don't know about the other side since i have not tried installing it yet.