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Old 12-03-2020, 06:29 PM   #223
IROCZman15
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Join Date: Dec 2004
Location: Roxbury, NJ
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cool, if anyone else has more feedback, feel free to chime on in. Would 3.91s be too non-street friendly? I kinda don't think so. I mean I used to run the 3.73 gears with the old TPI engine (and 700r4) from 2004-2019. The 3.73 ratio was never bad on the highway, and I was never looking to blast across the interstate at 90-100 mph anyways. I think anything in the 4.11, 4.xx range might be a little too much, but a 3.91 coupled with the 700r4 overdrive plus locking up t he converter would be just fine.


Larry, i did a quick search for the GM made gears, nobody seems to be selling those. would that be something I would really have to seek out or where can I find them? I was probably going to go for the "lightning finish" on the gears, and I don't think a GM gearset would offer the lightning treatment that Moser/Us gears does. Apparently it helps with break-in and stuff? Can the GM gears only be found used or new-old-stock ?


As for the 3.91 gear with nitrous, I am struggling at how to mathematically determine how my current 3.55s would work with nitrous too. If I were running a 100 shot I would probably be at the very top of 3rd gear crossing the finish line. However if I were to run the 200 or more shot I planned on running, I am pretty sure I would have to shift into 4th gear (overdrive is a 0.70 ratio) before the line so that is not optimal. If I ran the 3.91s I'd hope to be able to stay at the top of 3rd gear while crossing the line when running no nitrous (current setup), and on a small shot I'd be into 4th gear, but on a bigger shot I would be into the meat of 4th gear. Since I have no idea how to use math to figure this out, I am just doing my best guess.

Basically, I want the car for feel more alive and woken-up not only on the dragstrip, but especially on the street. I want to take people for rides and have that killer instant acceleration. It is pretty good now, but thinking the 3.91s would really deliver the "pinned in the seat" experience.
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Last edited by IROCZman15; 12-03-2020 at 06:39 PM.
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