Fits 1955 to 1985 GM small block V8 and 90 degree V6 engines uses 168 tooth ring gear. Also fits 1990 and earlier GM big block V8 engines and uses a 168 tooth ring gear. Does not fit 400 cid or 454 cid engines. Has 10.75 inch and 11.5 inch bolt patterns. Compatible with Powerglide; TH350; TH400 and TH700R4 automatic transmissions

Fits 1998-up 4.8; 5.3; 5.7. 6.0L Gen III/IV LS engines including 2010-15 Camaro SS with L99 engine. Does not fit 1999-00 6.0L applications with 0.400 inch extended crank flange/flat flexplate or 1999-00 4.8L engines that originally came with a manual transmission.

Fits 1982 to 1995 Ford; Lincoln and Mercury C4 automatic transmissions. Uses a 157 tooth ring gear and a 10.5 inch bolt pattern. Compatible with 302 cid engines. Has 50.0 in oz. external balance weight. Special application.