check the door vin plate it will tell you what size tire it should have

if you want bigger tires get them but I am willing to bet you will spend near 500$
FOR 31's and you mileage will decrease.
if you want better gas mileage replace the O2 sensor plugs&wires and cap&rotor
clean the TB and AFM
people will tell you to buy the sparkplugs at sparkplug.com BUT http://catalog.autohausaz.com/autoha...odel=PUP-7-001 has everything OEM for cheaper

 

I would go with 31x10.50x15...everything comes in that size, it will give you a better stance and improved ride, plus it will look better.

The difference in MPG will be nominal in either direction, but by increasing the tire's diameter, you will drop the cruising RPM's a little. With that in mind consider this: the reason your RPM's "drop" is because the larger tire diameter changes the affective gear ratio of the differential and therefore makes the gears "higher" so it will take slightly longer to hit the "sweet spot" but we're talking about a 1.5-2" change so all of this will be barely noticable at best. Just trying to explain the theory; the best way to experience this would be putting on 36's with stock gears, it'll take forever to get up to speed, but once it's there you're practically at idle.

I have a 1986 22R stock with 4.101's in the third and rolling on 33x12.50x15's. There is a small decrease in acceleration, but once I'm cruising in fifth it sounds nice and smooth. Keep in mind though that was in increase of 6" in tire diameter for me so that's why I have the small decrease, you won't experience that, so don't be concerned.

 

heh, most people tend to get all offended when i post stuff like that. here's to you, bud!

but seriously, changing tire size shouldn't affect your clutch as you say it does. i'd get that inspected immediatly!

-shaeff

 

agreed that's goofy right there........

 

I'm gonna get it inspected pretty soon. I'd just rather blame my 4.30's and my 31's than blame my clutch(which was questionably replaced almost 20K miles ago) I don't want to put anymore money into it.....I'm already burried into it about $4000, and I doubt I could sell it for that much. But on the upside(other than the clutch, and the bad U-joint) it drives VERY tight....even with 197,000 miles.

 

What?