Another 4 speed ID thread

Picture would go a long way... measure the front bearing retainer. Is it 5.125 OD, or 4.807 Non OD? It seems technically an a-body small block trans and bell, but they don't appear to match. An OD bell with a non OD gear box.

3743859 bell housing 10.5" small block 1975-80 A-F body "overdrive" 5.125" bearing retainer

PB is likely PP = New process
833 = type
2763 February 19, 1969

C-99126 maybe C-98126 for 1969-71 a-body