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IH 574 serial number and suffix

Chris I have a IH 574 gas with a 6 digit serial # starting with 138... and a suffix of BSX. What does it mean and what year is it? THANKS
Nick Best Hi there. The number you are quoting is the for the Skidded Unit, this plate is near the starter motor. The B tells you it is the fast speed gearbox (22mph), the S is the 14:51 bevel gear ratio and the X is the 611, 614, or 642 rev/min, single or dual speed PTO. The Tractor serial number is probably in the cab on the transmisssion tunnel on the left hand side. 7 numbers, letter, 6 numbers (I think).
Thomas I just bought a tractor I-574 and the guy didnt know what year it was and i think the serial number is 251005u002256. Wondering if somebody could help me out?

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