Want to upgrade your Dana 300 cheaply? You might try this seller.
“I have a pristine Teralo 4:1 gearset (dana 300) for sale. I pulled it out after breaking an output shaft. Teralow makes a stout reduction gear set, and this set has less than 1000 miles on it-2 1/2 wheelin seasons. There are no signs of wear, and no chips-looks brand new. I have the gearset, which sells for $600 new, and couple bearings. $275 .. http://www.trailquest.com/teralow/low300.shtml”