(reply to post at 12:43:42 04/07/17)
Possibly the transmission oil pump drive shaft ? This info is for the quad range.
http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet_Alt
http://jdpc.deere.com/pimages/RXP7/RXP7791________UN01JAN94.gif
TRANSMISSION OIL PUMP
(QUAD-RANGE)
Cart KEY PART NO. PART NAME QTY TRACTOR SERIAL NO. 4640 4840 REMARKS
1 AR79836 OIL LINE 1 X
2 R82161 MANIFOLD 1 X (SUB FOR R63998)
3 AR78652 GEAR 1 X (SUB AR78649) (ALSO ORDER RE20919)
4 AR78653 GEAR 1 X (SUB AR78649) (ALSO ORDER RE20919)
5 R51029 DOWEL PIN 1 X
6 RE20919 HOUSING 1 X (SUB FOR AR85539) (MARKED R63997 OR R82164) (ALSO ORDER AR78649)
7 A3606R O-RING 1 X
8 R64406 OIL LINE 1 X
9 A3917R O-RING 1 X
10 AR71016 OIL LINE 1 X
Cart KEY PART NO. PART NAME QTY TRACTOR SERIAL NO. 4640 4840 REMARKS
11 R40147 FITTING 1 X
12 A4808R WASHER 1 X
13 R53169 SCREEN 1 X (NYLON)
AR26375 SCREEN 1 X (STEEL)
14 R41008 CAP SCREW 2 X
15 R67247 BOLT 2 X (SUB FOR R64401)
16 R27218 FITTING PLUG 1 X
17 R26448 O-RING 1 X
18 R26372 SPRING 1 X
19 R42849 BALL 1 X 9MM (3/8")
Cart KEY PART NO. PART NAME QTY TRACTOR SERIAL NO. 4640 4840 REMARKS
20 R56462 O-RING 2 X (SUB FOR B2762R, THIS APPLICATION)
21 R66049 PIN FASTENER 1 X
22 F3171R O-RING 1 X
23 AR72101 FITTING PLUG 1 X
24 R41168 CAP SCREW 1 X
25 R51383 SELF-LOCKING SCREW 1 X
26 15H558 PIPE PLUG 1 X 1/8"
27 R41008 CAP SCREW 1 X (SUB FOR R43252)
28 R64407 OIL TUBE 1 X
29 R41041 CAP SCREW 1 X
Cart KEY PART NO. PART NAME QTY TRACTOR SERIAL NO. 4640 4840 REMARKS
30 24H1653 WASHER 1 X 13/32" X 1-1/4" X 0.120"
31 R48792 WASHER 1 X
32 R66061 HALF CLAMP 1 X
33 19H2284 CAP SCREW 1 X 3/8" X 7/8"
34 R30959 LOCK PLATE 1 X
35 T13814 CLAMP 1 X