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Old 06-19-2003, 04:02 PM
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Granny Gearing?

Hi all, hopefully the last trans question I have for a long time.

Basically, I like hard launches off the line, but still have the ability to pull off a smoke show or 2. (who else doesn't) But for those who have read about my tracker project, this whole gear ratio (compare the rear end against final drive ratio for RPM w/ tire height and all the rest of it) idea has me overwhelmed.

basically if a trannies first gear is like say 4.27, it's a granny shift and will act like a big truck right? so what would a 3.42 compare to say with a 4.81 rear? granny or go?

sorry for all the trouble, just the first time I have ever considered a project this accurately.

Perhaps someone who knows what certain combinations feel like could give me some help. Or what the final ratios will produce for cruzin at 70 Mph (which in canada is not speeding, it's actually slow on the major highways, as stoned chuaua could tell you)

sorry for buggin everyone, lack of experience I guess.

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Old 06-19-2003, 04:48 PM
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Tranny gearing is pretty well fixed unless you want to $pend big buck$ for one of those after market jobbers. I think you question is about rear end gears. Here is MHO about what too run for a compromise of good launch and highway cruising comfort.

If you are running a non-overdrive tranny you need to decide whether you like cruising or smoking better. Fro cruising, you need to get something in the 3:00 to 3:23 range to keep engine rpm within reason. 3:54s on the outside but that will have your engine running in the 3000rpm range at 60mph. To smoke you might go up to 3:70 range but your cruising speen will be limited.

If you are running an overdrive tranny, you can have your cake and eat it to. Then you can go with 3:54 to 3:90 gears which will likely let you bust your tires loose yet keep your engine tame (~2200rpm @ 60mph.) at speed.
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Old 06-19-2003, 11:56 PM
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thanks willy appreciate it, I think I got it all worked out now.
Thank you very very much

hopefully the next tranny posting will be to show off the finished product.

Hollywooding
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