Ok so I put most of your comments from page 1 into one place, so I don't get confused by what others have said. And then I will comment in blue.Keep in mind that I'm just a guy with a calculator, that happens to have a GVod.
I'm gonna post it out as I go, on account of my computer likes to lock up and loses the draft when it does.
Have you given thought on how to fit those 315s into the Duster tubs?
I'm not understanding this comment; so I'll take a stab at it' . Sensitivity at tip-in is always one of:
1) too much low-rpm timing, or
2) primaries that are too big, or
3) too small a rear gear, or
4) a spastic right foot, or
5) some combination of the above.
Oh yeah, yur on the right track.
But I see two things in your thinking that I can't agree with;
1) You have a 408, and
2) on street tires, that
3) in a Duster weighs practically nothing to a 408
Ok so with a 408, a 727, a modest stall, on 295 Cobras, in a duster ..... is a recipe for tirespin......... no matter what rear gear you run. And there is NO CHANCE to split second and third. I mean you can but there is NO POINT IN A STREETER
Lemme explain
Your 727ratios are 2.45-1.45-1.00 adding the .78 GV ratios in Red I get
2.45-1.91-1.45-1.13-1.00-.78od, your splits are
.78- .76-.78-.88-.78
So if you are in second-over and shifting to Third your Rs will drop to 88%, which, from 5500 is to 4840, is a drop of 660 rpm, which sounds good but here's the deal; with street 295s and 3.23s, that comes at 85 mph, and in all likelihood your tires will still be spinning. Soooooooooooooo what advantage is there to having the GVod in this instance? Answer; I hope you are somewhere that the coppers ain't. Remember what Rusty said? So that's strike one.
Strike two for splitting is;.
Between First and Second the splits are very nice and tight, a sucked out 318 would love it, for all the reasons you would think.
But will your 408 love it? If your tires are spinning in first on the split, then no. If your 408 spins the tires in second gear then no. I have had those Cobras behind my 367 and she spins them to long past 60
If your 408 cannot roast 295 street Cobras to 60 mph. it is sick. So then, what advantage is the GVod in this instance? For splitting the big 408, IMO, nothing; certainly not anywhere near worth the buy-in.So that's strike Two.
Strike three is this; The GVod cannot be backshifted under power. So when going from First-over or Second-over to the next non-over gear the power has to be interrupted while the unit out-shifts.
End of the bad stuff.
Here comes the good stuff
With 3.23s your trip to 65mph cruising speed could end at 3000/zeroslip3300 under power in Second over. Dropping into Third-over at 2060@zero slip. Do the math. That is a drop of 38% making the OD EFFECTIVE ratio.62.
OOPs the grandkids just showed up
