Mike,
I still have the 3.91 rearend that was in my truck, but it is not a
suregrip. A friend of mine has a Powertrax unit in his dak and it works
real well. The parts listed in Mopar Performance will work on your truck
all premags are the same internially just some have carbs while some have
tb's. Where in the 18's are you running the first few times i ran my truck
i was in the 18.8's. I had to adjust the timing to get the speed out of
the thing.
Alex P.
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