Hello on my 670( mine was a later model also ) I replaced my sprage clutch with one from a G 900 it was over 2 X as wide as the original and we never had trouble with it again and we used this tractor as the big tractor on a 200 acre dairy farm it ran every day of the year. try a salvage for a used one that is how I found mine , we were looking in the 670 bins and I looked in the 900 bin to compare seen it was wider and thought the wider the better.
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