The link below may help you with IH ratios if you are thinking about reducing speeds in first. It doesn't cover W-6 though, but D Slater just gave you the W-6 ratio. W-6 ring and pinion will speed up a M. If going the other way, M gears in a W-6 will slow it down.

It should be noted that SMTA and up parts may not interchange with earlier same size tractors. In some cases a machinist might be able to do some magic.

If you were to tell us what you want to do, the board members could give you better answers.

When it comes to swapping parts, a parts book or the CaseIH parts site are invaluable.
IH ratios
 

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