GEARING QUESTION.......

[cheapazz]

I have seen on different sites where some owners have taken the pumpkin from a 6mt and installed it in a 5at.......is there an actual benefit to this? Did they really install different gearing ratios? If so.....anyone know what the ratios are??

Thanks in advance......

[Poyzinous]

transmission ratios are the same, but the rear end changes the ratio between th e trans and final drive ratio. The auto cars i believe have a 3.43 and the Manuals have a 3.54. Your acceleration improves, but fuel economy suffers 1 or 2 mpg above 60, and the faster you go. Some Manual cars have the nismo 3.73 rear end in them, but the owners refuse to drive over 70, since they barely muster up mpg in the low 20's.Ratio, simply put, is the speed variation between the drive gear and the driven gear. when they are both the same(4th gear in a AT and 5th in a manual) the ratio is 1:1. output is lower in overdrive, the last gear, 1: 0.79 or 0.76 so that the drive gear spins the driven gear at a faster rate. 1st gear is your shortest ratio. usually around 3.5:1, since the car needs to overcome laws of physics. If you have a bike, put your drive gear on the biggest and the rear driven gear on the smallest, and try to start pedaling. you wont go anywhere. Ratios are just multiplying torque to get the car to accelerate. A car will put down the most torque in its lowest gear. Dyno runs are done in the gear closest to direct drive, or 1:1 so measurements are as accurate as possible. A simpler explanation is with a lever, load and fulcrum example. Placing the fulcrum close to the load makes force required to raise it minimal, but elevation will also be minimal. conversely, placing the load further away will make the load harder to raise, but it will elevate much higher. the ratios in the transmission just are a moving fulcrum progressing with vehicle speed.

[cheapazz]

Just what I was looking for....thanks.

[tollboothwilley]

Gearing for the 5AT is 3.37 where the gearing for the 6MT is 3.53

Your top speed will be reduced as will your MPG but with noticeable acceleration.

If you don't drive your G a ton then this is a good mod.

[cheapazz]

6,000 miles in a year.....think this might be a good upgrade. I don't worry bout mileage too much anyway. If I was I would have gotten a prius or sumthin like that.

[tollboothwilley]

Def. a worthy upgrade for you. Did you get that VB installed yet?

[cheapazz]

Do you see pics and write-up yet?? J/K...Nope, been on the road alot....goin back out today. Gettin ready to go out full time shortly so it may be awhile.....or I can just have it done. I don't like the thought of someone else up in my girls guts though.

[G_whizz]

DAMN Gabriel!

Has anyone told you



YOU ROCK!

[Poyzinous]

[4drsleeper]

I only put about 8-9K miles a year on my car with very little highway milage. I would definitely be interested in this mod. Anyone know what kind of price I'm looking at?

[tollboothwilley]

Depends..but normally you can find a used 3.5 FD differential with LSD for $350-400.

New aftermarket have some better options but they are like $1500 new...