GlobeCLK

iTrader: (5)

Hey people:

What does all the gearing numbers mean? What do they affect?

Like, 2.53 2.05 1.52 1.000 .835

What about FINAL drive? How is that changed and what does it affect?

someone please gimme some brief info on these please?

I think the numbers are closer the better. Because there's less of a RPM drop between shifting right?

thanks in advance

SilverGSguy

i think those are gear ratio numbers, im not an expert in this so someone correct me if im wrong. i think those numbers mean basically when your gears shift, such as in a car with 800hp you would want the gears to be farther apart so you dont max out the final gear going 160 but 200mph. in a car with only 200hp, you would want the gears closer because the engine wont be able to run up to 200mph anyways. basically i think that if they are closer, the gear shifts are faster and rpms dont rev up as high.

correct me if im wrong

Mean Gene

Globe - Those gearing numbers are the ratios the tranny has & are the torque multiplication numbers to the differential gears ( or final drive ratio ). The fourth gear is the 1.00 so the gearing is 3.26 ( the stock rear end gears multiplied by 1.00 ). The fifth gear overdrive is .835 so the cruising ratio in overdrive is 2.72 ( 3.26 gears times .835 ). Just think about a standard tranny - remember how the first gear ( especially the "granny" first gear!:eek: ) will pull? This is another way to fine tune your car but Silver's correct in that U don't want a big drop in rpms between shifts or the car will fall out of it's powerband & slow acceleration. Haven't really paid attention to where the tranny shifts if U don't E-shift but as long as the engine falls back to around 3k ( where the torque band begins ), that's about the correct shift point.

GlobeCLK

iTrader: (5)

thanks for the help guys!

What does FINAL DRIVE have to do with? top speed?

Mean Gene

Yep - with the overdrive .835 giving the GS a long legged 2.72 ratio, that's about the same as Lingenfelter used in his 226 mph 'Vette.

98gs4

What rear end gear is used in the GS4? If it is a 2.72, it seems like I am running to high of RPM's for that gear. Just curious. Thanks.

LexusRules

all overdrive gears are gears that are under 1.00 right? for exacmple 0.91 or 0.74 would be overdrive gears rigth? thats why some cars have double over drive?

Mean Gene

Sasha - Yep, anything below ( numerically ) a 1:1 ratio would be considered an overdrive. Seems like it should be called an UNDERdrive to me??
98 - The stock rear end gears are 3.26. The 2.72 ratio comes from the overdrive engagement using the .835 ratio. My overdrive is 3.14 because I have the RMM 3.76 geared LSD.

98gs4

I used to have a Cobra with 3.11 and it did not run the RPM's that this car runs.