The newer t-case is always the strongest, with the 78-80 being the best 1" center pin t-case. Toyota also made a 34 mm center pin one peice case for South America, however, that is also obsolete.
Danny Warden made a bilite aluminun case ($1349.00), He is no longer in business.
I looked into making a billite case, but, with my new manager, we have gotten very busy and I have not had the time to finish the project!
AA is planning to sell a cast iron case with a 4 to 1 gear set for some time now.
Make sure that there is at least a 5 inch lb preload on the output shaft. I fell that a loose output shaft only helps break cases
1980 Toyota - 1997 3RZ-FE 2.7l Engine, Turbo R151F 4.31:1, Triple Turbo Marlin Crawler Billet (2.28x4.70x4.70) = 1,148:1 Crawl Ratio, Marlin Crawler Twin Stick and Short Throw Shift Kits, 30mm H/D Output Shaft, High Angle Drive Lines, 5.29:1, ARBs, High Pinion Front, 25mm HD Billet High Steer Kit, 6 Pin Locking Hub Bodies, 86+ Wide Rear End, V6 3rd member, Chromolly Axles all around, 37" IROKs with Beadlocks, York onboard air - Rollbar air tank, Premier Power Welder, Marlin Crawler 4" USA-made Leaf Springs, Bilstein Shocks, et cetera....