Re: better MPG?

Posted by Jonfarmer on July 21, 2006 at 19:58:26 from (165.121.144.5):

In Reply to: better MPG? posted by Tim Shultz on July 21, 2006 at 19:03:47:

My 1989 F150 that I used to have had 4:10 granny gears and a 4spd standard. Great for offroading and heavy pulling, but not so highway friendly when driving 50+ mph. I had to turn more engine RPMs to get the same speed as a vehicle with taller gears. Lets see, I had to turn something to the tune of 2200rpm for 50mph in 4th gear, so if you were to swap out the gears to something more highway friendly like 3:73 or 3:08 you would see better gas miliage since the engine would then be able to turn slower. Your proformace would go down, it wouldn't be so good for playing off road like it is now. Remember to replace both the gears for the front and rear since it's a 4x4 truck, so your problably looking at Oh, $400-$500 in parts. Something else you could do is see if you can find a 5spd that would fit it, one that has a higher overdrive gear to get speed while lowering engine rpms. I now have a truck with 3:73 gears and a 5spd, thats kind the best of both worlds because it still has pretty good off road capability in 4wd low and is more highway friendly. If you change the gears you probably won't be quite as happy with it because it won't throw you back in the seat as hard as it does now when you step on it, just so you know and won't be mad at me for suggesting these changes to you and then be unhappy afterwards. As the old saying goes "you don't get something for nothing". If you think the gas miliage is poor now, it'll probably get worse with that crate motor you were talking about.

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