It SUCKS
I had it, and it barely helped out my 60 ft times.
It also cause the premature failure of some plastic gaurds from the spring pressure on the spider gears to cause the spider gears to eat a hole in the case, causing the same problems as one without (and this was with a diff kit), but with limited/unsafe limping abilities.
Save your money, get a Quaiffe, or do this
http://www.hardcars.com/headerman/diffpin.jpg
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