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Cornfed G37x sedan

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Old 06-09-2018, 11:58 AM   #166  
guy from norcal
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That is a ton of goodies you got.
What will be the RPM difference be when your doing 70 mph with the new gears?
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Old 06-11-2018, 11:52 AM   #167  
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In 7th, with stock gear, is in the area of 2250 RPMs. With the 3.692 gears you are about at 2500 RPMs at 70mph.
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Old 06-11-2018, 06:02 PM   #168  
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That is a ton of goodies you got.
What will be the RPM difference be when your doing 70 mph with the new gears?
Thanks buddy! As he said, not that much. Only around 250-300 rpm. Zer099 is only person That I have been able to get a hold of that has actually done the diff swap in a g37x. Going to borrow his scales to corner balance the car in a couple weeks, should be fun! Hopefully itís not sad to see what it weighs lol
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Old 06-11-2018, 07:21 PM   #169  
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I assume i could get a g35 diff RWD and swap out mine? (non X)
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Old 06-12-2018, 06:11 AM   #170  
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I assume i could get a g35 diff RWD and swap out mine? (non X)
By having a none x (no awd) you sir lucked out. Itís alot harder to do the front diff and rear diff than rear. None the less both. Iíwould look at Z1 Motorsports website and just do their rear diff package and pick out what all options you want.

You have a bunch of options in gearing to go to being just rwd. I think you can choose all the way down to 3.1 final drive and all the way up to 4.08. If I was you, I would read some of the reviews for the 3:9/4.08 gears. Some people really love it. 3.69 is as high as it goes for the x, without being extremely expensive.
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Old 06-13-2018, 11:13 AM   #171  
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Fast intentions said ďflex plate is roughly 2 pounds heavier than OEM due to it being sold aluminum with no window cuts.Ē

Iím sure itís a typo and it ment to say ďsolidĒ instead of sold. Just a fun fact. I thought it would be lighter until I held them side by side. I know itís only 2 lbs but weird enough you can actually tell a difference in weight. Lol I was told if Iím worried about the weight, loose it somewhere else hahahahaha



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Old 06-13-2018, 10:09 PM   #172  
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When is she supposed to be done?
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Old 06-21-2018, 05:35 PM   #173  
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When is she supposed to be done?
So the trans is done today!!!! Itís built and just needs to be filled up with 11qts oem matic s (level 10 calibrates transmission to run off of this fluid not anything else). $900 labor for install parts into trans.
Breakdown. Paid $500 for a 7at trans, bought exedy clutch kit $500, level 10 vb and tq converter was $1800, and the flex plate $800. I saved around $1000 out the door building the trans myself locally. Yes I saved money because Iím sure level 10 would of done more work to hold more power but I will never see more than 550 whp on this car so I saved that $1000 to buy another nitrous kit. Could of just done the level 10 bullet proof trans for 5k. Still would of had to buy fluid and the $800 flex plate but thatís it. Pat from level 10 laughed when I asked him if this setup will hold a 150 shot of nitrous and extreme daily abuse. Definitely no issue. Also didnít opt for the custom shims from fast intentions since Iíll be no where near a place where I would need them.

Now we are working out the diff and other small tasks. Got a lsd rear diff going in, wondering how thatís going to feel compared to my open rear diff I have now.
What all is getting done.
Run a good ground for trans
Raise headlights up
Heat wrap headers/test pipes
Trans/power steering cooler install
Replace power steering pressure switch
Sub frame collars
Install z1 motor mounts ([email protected] promised me they would fit)
Custom mount a black mishimoto universal coolant reservoir
Fix the a/c (wonít charge Freon blows hot air but compressor works)
Install z1 master cylinder brace
Swap the correct rib count serp belt and inspect all the pulleys with belt off
Flex plate install
Swap diffs and bushings
Swap built trans back into car
Power steering boot leak. Fix both sides.
Also Uprev shows a code of p0550 (power steering pressure sensor) so replace that also.
Make car more aero/braces underneath

Going to ride out the stock driveshaft till the new one comes in. Havenít ordered yet. Making sure measuremenrs donít change since I changed the diffs. Also curious if I lost weight between the g35 diffs and my g37x diffs. The g35 ones are extremely light. Havenít held the g37x ones yet they might be just as light.
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Old 06-21-2018, 06:38 PM   #174  
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Eagerly awaiting review of the G35 diff/gearing change. I may possibly be more excited than you are. I have diffs available to me, just awaiting news on your build to drop the hammer on them.
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Old 06-21-2018, 07:12 PM   #175  
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Eagerly awaiting review of the G35 diff/gearing change. I may possibly be more excited than you are. I have diffs available to me, just awaiting news on your build to drop the hammer on them.
Zer099 has completed the swap already. Heís local to me also. He has a lot of knowledge on the swap. My mechanic says he has swapped front diff before and had no issues. Quoted around 600-700 labor to swap front and rear diffs and bushings. I was assured these diffs will work. But weíll see, Iíll let you know. Should have it back in a week. Lol lots of hiccups so far but it happens when you go this far down the rabbit hole lol
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Old 06-21-2018, 07:14 PM   #176  
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Only issue not resolved yet on this build is the one piece rear driveshaft.
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Old 06-21-2018, 09:51 PM   #177  
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Originally Posted by lorentzoe45 View Post


Zer099 has completed the swap already. Heís local to me also. He has a lot of knowledge on the swap. My mechanic says he has swapped front diff before and had no issues. Quoted around 600-700 labor to swap front and rear diffs and bushings. I was assured these diffs will work. But weíll see, Iíll let you know. Should have it back in a week. Lol lots of hiccups so far but it happens when you go this far down the rabbit hole lol
Yeah man. Youíre going foot to the wood with the drivetrain. I am just so curious to see how the gear ratio change goes.
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Old 06-21-2018, 11:15 PM   #178  
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Very exciting watching this build come together. So much usefull info. Thanks once again!
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