Farmall 350 or 300

Todd A Poor · Jul 14, 2009

Does anyone Know how to tell the difference. Here"s the problem It has the serial number tag but can"t make out the Model number it has the white on the hoods and grill and the tags are missing off the hoods I can make out 350 I think but how can I be sure?

Anonymous-0 · Jul 14, 2009

Check the casting date code. There are a few threads on that around here. Do a search for that once you get the codes from some major castings.

mkirsch · Jul 14, 2009

Casting codes look like this: XX-YY-Z

One/Two numbers (month), one/two numbers (day), and a letter (year).

A 300 will have casting codes ending in A, or B. Early ones may have casting codes ending in Z because they started casting parts for the 300 in 1954 so they'd be ready for late 1954 delivery.

A 350 will have casting codes ending in C or D. Early ones may have casting codes ending in B, with cast dates in November (11) or December (12) because they started casting parts for the 350 in late 1956 to be ready for delivery in early 1957.

agpilot · Jul 14, 2009

Hi mkirsch: You posted good onfo on casting codes. I was wondering if you (or anyone else) has a firm idea on when Dip Sticks, for checking engine oil level, were started on 300-350's rather then using the oil pan petcocks? Thanks.. ag

D Slater · Jul 14, 2009

Also if the serial # is higher than 17000 and something it would be a 300. Lots of parts can be switched around between those tractors, so several things should be looked at. Here is just a few, if date codes check out you may want to see if the engine is marked C-175 and engine serial # matches the serial range of tractor. Shaft with double ended linkage holes, the one T/A handle linkage goes to will have the # 365961 R1 on it for 350. 300 one has a different #. Also the 300 clutch pedal will have a set screw and jam nut in the very bottom and none in the 350.

D Slater · Jul 14, 2009

Best information I have come up with so far for a regular farmall gasoline tractor is 300 serial # 9338, engine # 9341 and higher.

Wardner · Jul 14, 2009

I don't own a 300 or 350 but I assume the some of the differences on a 400 and 450 will apply.

The steering wheel is the easiest tip off. 400 uses a M type keyed wheel. 450 uses a splined wheel. There is more plastic on the later wheels. There is also a 3 inch plastic "horn button" on the 400.

The cowl on a 450 has several holes for switching from single to double acting hydraulics. On a 400, the right side hood has to come off to make the switch.

I don't place much faith in casting numbers. IH stockpiled many castings for six months or more. All they are good for is to indicate that a tractor could not have been assembled before the last date. In some cases, that won't even work as parts could have been replaced due to some failure.

Isn't there also a displacement increase on the 350? That number will be cast into the block above the oil filter.

Wardner · Jul 14, 2009

"There is also a 3 inch plastic "horn button" on the 400."

Should have been 450.

CoopertownBob · Jul 14, 2009

Look on the distributor side of the engine block for the "C" code on it. A 350 will have a "C-175" code, the 300 will have a "C-169" code.

Farmall 350 or 300

Todd A Poor

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