Buying a coworker truck, should I do it?

I'm in a situation where a coworker can tell me a truck a Ford F150 super crew for 6500. He Told me to give him either 500 or 1000 for a down. And is willing to work with me on the payments from 300 to 500 a month. Now my question is is it worth it? The truck is a 2004 as 110000 miles no check light engine. The truck runs good. Is it worth it? For not going to a dealership in having a coworker sell it to me? Also not dealing with paperwork at a dealership and financing.

I have a 1994 ford f150 XLT supercab with a v8 5.0. It needs a rear axle?

I have a 1994 ford f150 XLT supercab with a v8 5.0. It needs a rear axle. On the door It says "Axle 19" and thats the 3.55 ratio axle. But I can't find the actual axle or a picture of the axle online. I got a photo of the differential cover but can't find the same axle online. Does anyone know what the name of the axle might be. Or have any tips on how I could find it online easier

Would I be able to use 15w40 year around in North Texas climate?

I drive a 1994 Ford F-150 Straight 6. Engine is old, 184000 miles. Starting to leak. I'm going 15w40 anyway, but I'm wondering if I can use it year around; as the weather here is all over the place and it is rare that we dip below 15 degrees F in the winter.

Seriously anyone who knows North Texas weather knows that you can have 70degrees one week and then 40 degrees the next. Below freezing days are rare and when they do happen they cause the town to shutdown if wet weather is involved.

This is a gas engine by the way and I'm aware that 15w40 typically goes in diesel engines. I don't care about that the decision is already made I just need to know if it will be fine in my truck in this schizophrenic Southern climate.

Added (1). P.S.
I strictly use conventional oil in this truck.

Ac not blowing cold?

I have a 2001 Ford F-150 cat crew cab and when I charged my ac it was blowing cold and now it will only get cold if I have my foot on the gas. And sometimes it doesn't even get cold anymore just hot what do I need to replace