https://summitracing.custhelp.com/ap...ion-dimensions



Listed below are the critical dimensions of the T56 in comparison to T5 and traditional four-speed transmissions. Metric dimensions are converted to inches, rounded off to the nearest 0.1 inch.
Trans model A B C D E F
GM Super T10, Muncie, Saginaw 6.3 14.2 23.0 N/A N/A 3.75
GM T5 (V8) 6.3 16.0 25.0 19.0 21.2 3.75
GM T56 F-car (production) 4.9 21.0 26.4 21.1 23.9 3.75
GM T56 F-car (aftermarket)1. 6.3 21.5 27.0 21.6 21.6 3.75 Ford T5 6.9375 14.5 24.125 N/A N/A 5.5

Notes: 1. Dimensions B through E include 0.5-inch-thick adapter plate