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Hey Tom -
Are you sure your speedo and tach are reading right? My Chevelle has the
same rear tire size with a 3.42 gear (car sees lots of highway time) and I'm
seeing 2950rpm @65mph with a Holeshot 2400 converter behind the 406. I figure a
4.10 gear in my car would come in around 35-3600rpm which is what the other list
members are seeing with their cars. I can't vouch for the absolute accuracy of
my tach (Auto Meter Sport Comp 5" Monster), but it is relatively new and my
speedo was calibrated by the trans shop when they installed the TH400 two years
ago. I don't think I'm getting any extra slippage with that converter at that
rpm because the cruise rpm was the same with my old TH350 trans and
off-road/heavy duty converter (tighter than stock). Anyway, I was just curious.
Cliff Klimas Hamilton, NJ
'71 406 Chevelle (500+hp 427 SBC coming next month!)
'88 CSC (slow as s**t but looks/sounds good)
> I run about 2800 RPM at 65 and about 3000 at 70. I have a 2500 stall behind
> a 500 HP 454. I am running 275 60 15 rear tires. Believe it or not I
> actually get fairley good gas mileage on the highway about 14-15 mpg. Also
> keep in mind that it is a true 4.10 gear with tires that are 26 inches tall
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