What A-833 is this?
Every 75 and 76 OD I have ever had were cast iron. I was under the impression they only made cast iron in those years. I did have an aluminum unit but it was a 1978. So I would say they were cast.
I just read:
Chrysler’s full-size and mid-size 1963 models were the first to feature an available four-speed transmission. The 318, 361 and 383 V-8 engines used the familiar Borg-Warner T-10 four-speed that year; however, the New Process A-833 four-speed transmission was developed for Chrysler soon afterward. The A-833 was built at New Process’s Syracuse, New York, plant and rolled out in the 1964 models. Its production continued until the mid-1980s. All early versions of the A-833 were made with a cast-iron case. Aluminum-cased units were used on the A-833 overdrive version, which began in 1975. Because the cast-iron units were much more rugged, these are the most sought-after replacements for four-speed transmission conversions.
The A-833 was reconfigured as an overdrive transmission using an aluminum case in 1975 and was used in Chrysler cars and trucks for added fuel economy. The overdrive version of the transmission reduced the third gear ratio to .73:1 to be used as the overdrive, and the 1:1 fourth gear became third.
The overdrive configuration with a 23-spline input appeared in these vehicles:
• 1975 to 1979 Valiant, Duster, Dart, Scamp, Swinger, Volare and Aspen (3.09:1 ratio first gear)
• 1975 to 1987 Dodge light-duty pickups and Dodge and Plymouth vans (3.09:1 ratio first gear)
• 1977 to 1979 Diplomat and LeBaron (3.09:1 ratio first gear)
