low pinion front and rear.
unfortunaltely, i believe they are the same strength in the rear. i know the birfields are the same strength. the only big differences are the d-shaft flanges and third member sizes. the front axle is also gussetted on all 62's. i cant remember the width. can measure it if no one knows.
post in
http://www.ih8mud.com/ and they should be able to give you some good answers.
i am interested in the birfilelds, shafts, and ring and pinion if you would like to sell them.