I have the later 44A6857 - 13071 (end production) parts book published 1973 but it does not show a 5M2961 transmission group either as standard or option.
Only other source I can think of to check would be the 561B pipelayer which I do not have a parts book for.
Edit: The transmission actually comes from an earlier 44A1-3874
First -2.0 mph
Second - 2.8
Third -3.3
Fourth -4.3
Fifth -6.0
Reverse
First -2.4
Second -3.4
Third -4.1
Fourth -5.2
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