A 34mm (idler shaft) Toyota Split T-Case. The only rigs that came with them are 80-85 FJ60's however the T-case out of a 85+ FJ60/62 will work fine too as long as you swap the entire case. Very durable... the only thing that kills them is lack of oil and 500,000+ miles. Used are available for ~$200-400. Rebuild kits are ~$200.