Jack O'Brien
O'Brien's 4 Wheels West
1302 Hidden Ct.
Roseville, CA 95661-5882
tel (916) 773-3278
email
jack@unlimited.net
I talked to Jack at length one day ( it's impossible to have a short conversation with Jack). He is a metallurgist by trade, and has an impressive list of credentials and work experience. His gears, although close to double the cost of other gears, are made by a completely different process, and are much stronger. His gears are available in several different ratios, not just the Jeapeater gears that several of the vendors used to sell.
He not only makes gears for the Dana20, but just about everything else. He has a couple different detent spring strengths, and will rebuild shift forks. He claims he can make a Dana20 that's as strong as an Atlas t-case.
He has no web site, and does no advertising. Give him a call or try the email address.