I've been using them on tractors and trucks for years, since AC Delco switched over in 1988 from DD to GR and had their starters made in Japan (now China).
Direct drive free spins at 13,000 RPM and a gear reduction free spins at 4000 RPM.
When mounted on an engine, if KWs of power are equal, the GR will turn over a diesel faster in cold weather, and a bit slower in warm weather. Also tends to outlast the DD because there's less of a shock load on it.
I've been buying Chinese clones for $120 brand new and so far, not had one single problem. Funny thing is, some of these clones accept standard Delco replacement parts.
One thing to watch out for is low power starters. When the Chinese invasion first began, the GR starters had the same KW ratings as the DDs they replaced. But lately, they're selling down-sized power starters. Many that were 3.5 or 4 KW a few years ago, are now sold only 2.5 KW.
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