Need help decoding broadcast sheet

On line one going across, box 5 should have a single letter for the engine- I see L in your pic. That's 360 v8 4bbl. Line two for trans. box 2 = 21- That is 4 speed 833-Manual. Rear end should be line two going across box 4. What's in there?
The D codes I have are...

D56- 3.55:1 rear axle
D82- 8.25:1 or 8.36:1 Axle Housing
D91- sure grip diff

Leads me to these numbers on line 4

Pin: 37
P/shaft: 760
Axle: 281