Deere Gear

John Deere Riding Lawn mower starts, but won't go into forward or reverse?

I finished mowing the lawn a couple weeks ago and throttled down... when I throttled down I heard a clunking sound as I was turning the motor off... as it finally turned off, I started it again to make sure everything was ok, but it no longer would go into forward or reverse... I don't know what model it is... It's about 5 years old, not a zero turn, doesn't have gears, just forward, reverse pedals and parking brake on the right side. Any help would be appreciated.
I checked the pull tab on the back, it's not that... belt isn't broken...hmmm....

Check the drive belt on the bottom. It is probably broken....

John Deere Parts SUN GEAR L100166 6200 SN 124984 6100 SN 124984 6200 S
John Deere Parts SUN GEAR L100166 6200 SN 124984 6100 SN 124984 6200 S
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John Deere Parts STEERING GEAR ASSY AL31262 9402550 2355N23502255 2240 S
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John Deere Parts SPROCKET GEAR CASE DRIVE AE39654 567566558557556 550 SN
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John Deere Parts WATER PUMP RE55986 9600 Eng SN 499999 WIDE GEAR TRAIN TH001
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John Deere RE509865 Timing Gear Cover  Water Pump
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Used John Deere Bull Gear Nut John Deere part no A76R fits JD A G tractors
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John Deere Model A rear end bull gears off 1948 1
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AL71025 New John Deere Tractor Ring  Pinion Gear 1550 1750 1840 1850 1850N +
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John Deere Model A first reduction gear bearing cover off 1948 model A tractor
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T21876 New John Deere Differential Spider Gear 1020 1030 1040 1120 1130 1530 +
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AL110347 New John Deere Front Bevel Gear 6110 6110L 6120 6200 6200L 6210 6220 +
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H96294 New John Deere Vertical Bevel Gear CTS CTS II 6620 6622 7720 7721 8820 +
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R33382 New John Deere JD Tractor 4000 4020 Transmission Drive Shaft Gear
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L60105 New John Deere 2140 2650 2750 2755 2850 2855N Ring Gear w 48
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John Deere Model B rear end bull gears clf 1948 model B 1
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Original John Deere 3020 Gear Side Wheel Wedge Sleeve
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John Deere Flywheel Ring Gear R28811 T28811 103942
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Feeder House Reverser Gear Box John Deere 9400 9410 9500 9510 9600 9610
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PTO Gear Case 540 RPM Remanufactured John Deere AE42258
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JOHN DEERE 4010 TRANSMISSION FIRST  THIRD SPEED GEAR AR26458 R26063R
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John Deere A Gear Shifter A2643R
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John Deere JD A A4025R 2nd  5th Speed Sliding Transmission Pinion Gear
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