Help 4.08 Gears
12-04-2009, 08:21 PM
#62
Thanks it seemed a bit off thats why I asked, I just saw it on the first pages chart I knew something was off, I was a bit confused almost thinking about trading in my 6mt lol.
12-04-2009, 08:58 PM
#65
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so the gears sort of equal out (not perfectly) but enough for there not to be a HUGE difference
The 7at has a first gear of 4.92 (based on two separate sources).... and a rear of 3.35
12-04-2009, 09:24 PM
#66
I must have got lost, I thought we were talking about the rearend here. I didn't know the conversation went the way of the transmissions.
This is what I've gathered so far as of rear gears:
5 sp auto - 3.692
7 sp auto - 3.357
6 sp manual - 3.692
convertable - 3.92x
I want to put 4.08s in Her G37. I just need to find a set that fits.
This is what I've gathered so far as of rear gears:
5 sp auto - 3.692
7 sp auto - 3.357
6 sp manual - 3.692
convertable - 3.92x
I want to put 4.08s in Her G37. I just need to find a set that fits.
12-04-2009, 09:35 PM
#67
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I must have got lost, I thought we were talking about the rearend here. I didn't know the conversation went the way of the transmissions.
This is what I've gathered so far as of rear gears:
5 sp auto - 3.692
7 sp auto - 3.357
6 sp manual - 3.692
convertable - 3.92x
I want to put 4.08s in Her G37. I just need to find a set that fits.
This is what I've gathered so far as of rear gears:
5 sp auto - 3.692
7 sp auto - 3.357
6 sp manual - 3.692
convertable - 3.92x
I want to put 4.08s in Her G37. I just need to find a set that fits.
So amongst the talk of all the possible rear end ratios, some people looked my chart and saw a whole lot more numbers to choose from (I have the internal trans gears listed as well) So they started pulling numbers from there, adding confusion to the whole situation
12-04-2009, 09:40 PM
#68
Do you know if the carrier housings are all the same or no? The guys with 370Zs say that in order for a 370Z with an automatic to go to 4.08s, they first have to switch to an axle from a manual 370Z. I don't know why this is or if this is true for the G37s as well.
12-04-2009, 09:43 PM
#69
Ok your correct. I was misunderstood with his post. When he just said 4.92 I was assuming he was talking rear gears. I have no idea why he was mentioning the 1st gear. Also, I knew one of the cars had the 3.92, it's just the vert and not 7spd coupe.
12-04-2009, 10:16 PM
#71
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Do you know if the carrier housings are all the same or no? The guys with 370Zs say that in order for a 370Z with an automatic to go to 4.08s, they first have to switch to an axle from a manual 370Z. I don't know why this is or if this is true for the G37s as well.
I am real curious to see the results of this as far as how the car feels, and how much a difference in MPG should be expected (I am pretty content with the 20.5 mpg @ 32 mph average speed as calculated by the comp over the past 3,000 miles)
and does anyone know how the speedometer is going to be reprogrammed?
12-04-2009, 10:44 PM
#72
I've read (but haven't confirmed) that the speed is taken off the half shafts. If that is the case, no need to reprogram the speedometer.
The thing about gas mileage and gears is, it all depends on your driving habits. If you do a lot of driving in town or stop and go traffic, chances are you could see an increase in gas mileage.
I'm willing to bet that the G would feel great with a little more leverage off the line.
The thing about gas mileage and gears is, it all depends on your driving habits. If you do a lot of driving in town or stop and go traffic, chances are you could see an increase in gas mileage.
I'm willing to bet that the G would feel great with a little more leverage off the line.
12-04-2009, 11:10 PM
#74
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I used to have a 350Z that I swapped 3.93 gears into, the speedo was only off by 1mph but I also had 19 inch Volks so I can assume the computer compensating for the shafts is true.
Going from the 350Z's 3.5 rear gear to 3.93 rear gear was huge, my gas mileage dropped 2 mpg but the 04 Z only had a redline of 6800 so I was still in higher RPM cruising than with the G.
As for the acceleration, the difference will feel extremely noticeable. It turned the Z into a nail driver. The side effect is that if any of you have lightened flywheels like my Z did, they will get old fast as it will rev extremely fast when you are trying to drive slow with the aid of the gears and will make driving tedious for those of you with 6MT's. As well once I had the gears in putting my foot down in 1st gear was near useless, it would just spin the tires if you didn't slip the clutch heavily.
Just thought I'd drop some input from someone who has been there.
Going from the 350Z's 3.5 rear gear to 3.93 rear gear was huge, my gas mileage dropped 2 mpg but the 04 Z only had a redline of 6800 so I was still in higher RPM cruising than with the G.
As for the acceleration, the difference will feel extremely noticeable. It turned the Z into a nail driver. The side effect is that if any of you have lightened flywheels like my Z did, they will get old fast as it will rev extremely fast when you are trying to drive slow with the aid of the gears and will make driving tedious for those of you with 6MT's. As well once I had the gears in putting my foot down in 1st gear was near useless, it would just spin the tires if you didn't slip the clutch heavily.
Just thought I'd drop some input from someone who has been there.
12-04-2009, 11:12 PM
#75
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I've read (but haven't confirmed) that the speed is taken off the half shafts. If that is the case, no need to reprogram the speedometer.
The thing about gas mileage and gears is, it all depends on your driving habits. If you do a lot of driving in town or stop and go traffic, chances are you could see an increase in gas mileage.
I'm willing to bet that the G would feel great with a little more leverage off the line.
The thing about gas mileage and gears is, it all depends on your driving habits. If you do a lot of driving in town or stop and go traffic, chances are you could see an increase in gas mileage.
I'm willing to bet that the G would feel great with a little more leverage off the line.
and as far as the mileage goes I wonder how much difference it will be riding down the highway in 6th (I am lucky to have some highway driving to keep a respectable mileage)
Right now @ 75 mph the calculated rpm is 2,750 rpm so I wondering how going from that to a calculated 3,040 rpm with 4.08 will affect it...
I can't see it hurting my MPG that bad
