the early 20r's had issues with t-chains. guides specifically. the 22r's live forever.
from what i've read, they are purdy easy install for an N/A app. the mileage will be a smidge less, but performance will be an eye opener.
check this out,
http://answers.yahoo.com/question/in...5221033AAhhm6Q
it get a little more specific.
cheers!
owner 92 toy pu 4x4.