Help 6MT Rear-end Questions
Thread Starter
Joined: Nov 2010
Posts: 19,849
Likes: 5,143
From: Rochester, NY
6MT Rear-end Questions
I've been loosely planning in upgrading the rear end of my 6MT Sedan with 4.083 gears. I say "loosely", because it's a long off future mod, but also because every time I research it, I get somewhat lost in the weeds. (Not a mechanic.) However, from what I can gather, it's a feasible and rather dramatic modification for the 6MT crowd.
I know that the final drive ratio in my car is 3.692. What I didn't know until recently is that the 6MT Vert has a final drive ratio of 3.916.
So here's Question 1: can the rear end from the 6MT Vert swap as a direct plug-n-play install with the 6MT Sedan? (And no, not by me, LOL... by my mechanic.)
And here's Question 2: would it be more cost effective in parts and labor to buy and ship a parted out 6MT Vert rear end than it would to rebuild the rear end with new gearing?
There are likely lots of details I'm missing, so don't feel shy about educating me, if you're willing.
I know that the final drive ratio in my car is 3.692. What I didn't know until recently is that the 6MT Vert has a final drive ratio of 3.916.
So here's Question 1: can the rear end from the 6MT Vert swap as a direct plug-n-play install with the 6MT Sedan? (And no, not by me, LOL... by my mechanic.)
And here's Question 2: would it be more cost effective in parts and labor to buy and ship a parted out 6MT Vert rear end than it would to rebuild the rear end with new gearing?
There are likely lots of details I'm missing, so don't feel shy about educating me, if you're willing.
Last edited by Rochester; Oct 11, 2013 at 01:08 PM.
I've been loosely planning in upgrading the rear end of my 6MT Sedan with 4.083 gears. I say "loosely", because it's a long off future mod, but also because every time I research it, I get somewhat lost in the weeds. (Not a mechanic.) However, from what I can gather, it's a feasible and rather dramatic modification for the 6MT crowd.
I know that the final drive ratio in my car is 3.692. What I didn't know until recently is that the 6MT Vert has a final drive ratio of 3.916.
So here's Question 1: can the rear end from the 6MT Vert swap as a direct plug-n-play install with the 6MT Sedan? (And no, not by me, LOL... by my mechanic.)
And here's Question 2: would it be more cost effective in parts and labor to buy and ship a parted out 6MT Vert rear end than it would to rebuild the rear end with new gearing?
There are likely lots of details I'm missing, so don't feel shy about educating me, if you're willing.
I know that the final drive ratio in my car is 3.692. What I didn't know until recently is that the 6MT Vert has a final drive ratio of 3.916.
So here's Question 1: can the rear end from the 6MT Vert swap as a direct plug-n-play install with the 6MT Sedan? (And no, not by me, LOL... by my mechanic.)
And here's Question 2: would it be more cost effective in parts and labor to buy and ship a parted out 6MT Vert rear end than it would to rebuild the rear end with new gearing?
There are likely lots of details I'm missing, so don't feel shy about educating me, if you're willing.
Thread Starter
Joined: Nov 2010
Posts: 19,849
Likes: 5,143
From: Rochester, NY
That is funny. Forum posts in real-time. Well, if info comes, you're sub'd. Feel free to PM or post whatever info you uncover.My only first-hand experience in this area was early 2011, when I very briefly considered buying a new Mustang GT after the new 5.0L came out. When researching the car, I discovered there were 3 different final drive ratio options on the 6MT. And as luck would have it, one my my Ford dealerships had a 6MT with the short gears, as well as one with the tall gears. So I took them both for a solo test drive, immediately back-2-back.
The difference between the two was huge (to me). It made me wonder why anyone would bother with the taller gears. The short gears were so responsive, it was nuts. And yes, it revved a little higher on the highway, but not so much as to matter. (Again, to me.)
Never forgot that day.
Oh, and obviously I didn't buy the Mustang. Crazy fast, but way too raw for my taste, and kind of cheap looking.
Last edited by Rochester; Oct 12, 2013 at 08:14 AM.
1. I think you could do a direct swap with the vert rear end but I'm not 100% sure. As long as the driveshaft bolted to the pumpkin the same way then you should be fine. A 6mt to 6mt should be a straight swap. I think an auto is where it gets different. Again I'm not 100% sure.
2. Yes, it would be easier to just do a swap and call it a day, but like you said the vert gears are 3.916. If it were me; I would put the 4.083 gears in; bigger (shorter) is always better right? lol
I put the 4.083 gears in myself in my 350Z a few years ago and MAN what a difference. Best mod I've ever done. I'd like to do it again to my G37 but it probably won't happen. If you could do some more research on the vert rear end and find out if it's a direct swap and you find one for CHEAP. Like ~$500 or less then I would jump on it if I were you.
2. Yes, it would be easier to just do a swap and call it a day, but like you said the vert gears are 3.916. If it were me; I would put the 4.083 gears in; bigger (shorter) is always better right? lol
I put the 4.083 gears in myself in my 350Z a few years ago and MAN what a difference. Best mod I've ever done. I'd like to do it again to my G37 but it probably won't happen. If you could do some more research on the vert rear end and find out if it's a direct swap and you find one for CHEAP. Like ~$500 or less then I would jump on it if I were you.
That is funny. Forum posts in real-time. Well, if info comes, you're sub'd. Feel free to PM or post whatever info you uncover.My only first-hand experience in this area was early 2011, when I very briefly considered buying a new Mustang GT, since the new 5.0L had just been released. Research led me to realize there were 3 different final drive ratio options on the 6MT. And as luck would have it, one my my Ford dealerships had a 6MT with the short gears, as well as one with the tall gears. So I took them both for a solo test drive, immediately back-2-back.
The difference between the two was huge (to me). It made me wonder why anyone would bother with the taller gears. The short gears were so responsive, it was nuts. And yes, it revved a little higher on the highway, but not so much as to matter. (Again, to me.)
Never forgot that day.
Oh, and obviously I didn't buy the Mustang. Crazy fast, but way too raw for my taste, and kind of cheap looking.
oh and of course let me know anything you find out about that 4.083 gearing... IDK if I'd do it , to me it's a lot more than just a bolt on, wouldn't wanna go that far with mods yet considering my car is pretty much brand new.. but yeah LET ME KNOW for sure !
Thread Starter
Joined: Nov 2010
Posts: 19,849
Likes: 5,143
From: Rochester, NY
Here's a thread with some good info, although primarily about swapping for shorter gears in the automatic. Note the approximate $1500 in parts and labor. It's a good read.
https://www.myg37.com/forums/engine-...oh-my-god.html
I suspect there's a whole lot more detailed information and experience on this swap over on the 370Z forums. I really should troll around the Z more often. There's a lot more modding going on with the Z than the G.
https://www.myg37.com/forums/engine-...oh-my-god.html
I suspect there's a whole lot more detailed information and experience on this swap over on the 370Z forums. I really should troll around the Z more often. There's a lot more modding going on with the Z than the G.
Joined: Oct 2011
Posts: 6,103
Likes: 593
From: People's Republic of IL
Makes one wonder why they used a different setup only in the convertible. Can't imagine the target buyer being much different from that of a coupe or IPL. Speaking of IPL, does that use the 3.9 gears too?
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Thread Starter
Joined: Nov 2010
Posts: 19,849
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From: Rochester, NY
Before I bought my Sedan, a friend loaned me his 2010 6MT Vert for as long as I wanted to borrow it, so that I could live with the INFINITI for a while to be sure it was the car for me. Damn nice offer on his part. Although an excellent vehicle, the impracticality of the Coupe, compounded with the constraints of the retractable hard-top, cemented my decision to locate a 6MT Sedan. But it wasn't just the dimensions... the car felt heavy. Really, really heavy. This was not a car you could chuck around with confidence. However, it did pick up and go with authority. So I think they compensated for the extra weight through the rear-end gearing.
Here are the specs on the 4 different 6MT models:
Sedan 6MT - 3709 pounds
2013 Infiniti G37 Sedan Specifications | Infinitihelp.com
Coupe 6MT - 3708 pounds
2013 Infiniti G37 Coupe Specifications | Infinitihelp.com
IPL Coupe 6MT - 3718 pounds
2012 Infiniti Performance Line G37 Coupe Specifications | Infinitihelp.com
Convertible 6MT - 4149 pounds
2013 Infiniti G37 Convertible Specifications | Infinitihelp.com
Thread Starter
Joined: Nov 2010
Posts: 19,849
Likes: 5,143
From: Rochester, NY
You know, if the Vert compensated for the extra weight by using shorter gears, then if you flip that logic upside down... the net effect of putting shorting gears in the 6MT Sedan would be the equivalent of shedding over 400 pounds.
While the simplicity of that logic makes sense, I'm sure someone with a better understanding of physics would chuckle at that logic. Still...
Since I'm talking about it, here's of vid of that Vert from two years ago, with one of my girls opening the top at the end of my driveway.
While the simplicity of that logic makes sense, I'm sure someone with a better understanding of physics would chuckle at that logic. Still...
Since I'm talking about it, here's of vid of that Vert from two years ago, with one of my girls opening the top at the end of my driveway.
Thread Starter
Joined: Nov 2010
Posts: 19,849
Likes: 5,143
From: Rochester, NY
I've been loosely planning in upgrading the rear end of my 6MT Sedan with 4.083 gears. I say "loosely", because it's a long off future mod, but also because every time I research it, I get somewhat lost in the weeds. (Not a mechanic.) However, from what I can gather, it's a feasible and rather dramatic modification for the 6MT crowd.
I know that the final drive ratio in my car is 3.692. What I didn't know until recently is that the 6MT Vert has a final drive ratio of 3.916.
So here's Question 1: can the rear end from the 6MT Vert swap as a direct plug-n-play install with the 6MT Sedan? (And no, not by me, LOL... by my mechanic.)
And here's Question 2: would it be more cost effective in parts and labor to buy and ship a parted out 6MT Vert rear end than it would to rebuild the rear end with new gearing?
There are likely lots of details I'm missing, so don't feel shy about educating me, if you're willing.
I know that the final drive ratio in my car is 3.692. What I didn't know until recently is that the 6MT Vert has a final drive ratio of 3.916.
So here's Question 1: can the rear end from the 6MT Vert swap as a direct plug-n-play install with the 6MT Sedan? (And no, not by me, LOL... by my mechanic.)
And here's Question 2: would it be more cost effective in parts and labor to buy and ship a parted out 6MT Vert rear end than it would to rebuild the rear end with new gearing?
There are likely lots of details I'm missing, so don't feel shy about educating me, if you're willing.
Yes... but you loose the VLSD.
Thread Starter
Joined: Nov 2010
Posts: 19,849
Likes: 5,143
From: Rochester, NY
Well... there's my answer then. I'm not about to give up LSD for a slightly shorter rear end. So if I'm going to keep researching this mod, it will be for the Frontier 4.083 gear swap.
I'm looking at the itemizations on Infinitihelp.com, and the Vert doesn't show VLSD as a N/A item. It just doesn't list it.
Thanks.
I'm looking at the itemizations on Infinitihelp.com, and the Vert doesn't show VLSD as a N/A item. It just doesn't list it.
Thanks.
Well... there's my answer then. I'm not about to give up LSD for a slightly shorter rear end. So if I'm going to keep researching this mod, it will be for the Frontier 4.083 gear swap.
I'm looking at the itemizations on Infinitihelp.com, and the Vert doesn't show VLSD as a N/A item. It just doesn't list it.
Thanks.
I'm looking at the itemizations on Infinitihelp.com, and the Vert doesn't show VLSD as a N/A item. It just doesn't list it.
Thanks.
This was my plan... I actually went as far as ordering a diff from a sport vert... but not VLSD... I wouldnt give up the posi for it as well.