Anyone have any opinions on Gearvenders under/over drive verses a 700R4 tranny swap. I currently have a TH400 driving a 3.73 12 bolt posi and the revs are way to steep for long highway cruisin', 3000 @ 60 mph. Would like to drop them down to around 2000 @ 60 without swapping out rearend.
 
Thanks in advance,
John L.
70 SS454
ACES #5597

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