Difference between 4 speed, vs 3 speed with overdrive transmission?

Just wondering what exactly the difference is between a 4 speed transmission and a 3 speed transmission with overdrive. What the heck is overdrive?

This is in reference to manual transmission. I know I have overdrive on my automatic truck, which I have never ever used, but was told it can be helpful for towing uphill at slow speeds? I'm more interested in street rod application however, as I'm looking at buying a toploader transmission for a ford galaxie… I will probably be going with a plain 3 speed as they seem to be the least expensive, but am curious as to what "overdrive" means in these transmissions…

Can i remap a standard car?

Hi people i'm buying 56 plte ford fiester 1.4ltr it has irdium spark plugs new inductionkit new coil pack on but rest is all standard is it possible to remap it 1,2,3 stages cz i want a car with bit more horse power as i'm new to this i would like more infor please as i can't afford bigger car atm thanks?

Manufacturing engineering internship with ford, or systems engineering with Honeywell?

I have to make a decision between the two. Ford is giving better pay and housing assistance. I don't know too much about the job description but it seems like they have planned things out well. Honeywell seems good to, but less financial support however it is in a much better area.

Systems engineering overviews an entire project and can basically be called "project management" and it deals a lot with emergency power and liquid cooling (note: since I'm an intern it won't be that involved)

Manufacturing engineering deals with processes and the production of cars. It would be nice to see the automotive industry, however I don't want to be limited to only car companies in future career fairs.

What hose is this? (Auto repair)?

I need to know what it's called so I can get a new one. This is the back of the intake manifold on a 2.0L ford zetec motor

Thanks. What hose is this Auto repair