With the big block and it being a C20, it should have a Dana 60 rearend with 3.54 gears in it. Anything else would have been special ordered and listed on the glovebox door.
The tranny will be a TH400.
You will soon learn to absolutely love the ochre color and have 3 of them in your back yard just like me. 
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Bowtie Truck Stop Inc.
Mid-West GM Truck Restoration Parts Supplier
Your Key Parts, Auto Metal Direct, Dynacorn,
and Goodmark dealer.
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1971 C-10 Suburban (Ochre)
1971 K-10 Suburban (Ochre)
1972 C-10 Suburban (Ochre)
1972 K-20 Suburban (Yellow- that just aint right!)
Springfield, Minnesota 56087
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