Question about Diff Gears
Race Director
Joined: Aug 2003
Posts: 16,270
Likes: 30
From: "It's 106 miles to Chicago, we've got a full tank of gas, half a pack of cigarettes, it's dark, and
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-‘18-'19
NCM Sinkhole Donor
I would never change just the gears. Have the diff gone through and replace seals and bearings while it is apart. Yes - assuming the case is in good shape, it can be reused and upgraded to 3.73's.
I went from 3.42's to 3.90's. Big difference for the better!
I went from 3.42's to 3.90's. Big difference for the better!
Drifting
Joined: Aug 2014
Posts: 1,395
Likes: 390
From: Virginia
St. Jude Donor '18
2) Where does the speedometer pick up it's signal? Is this something I can have my tuner adjust after I do a swap? Or is there a mechanical change I need to do somewhere? I'd likely have it retuned anyhow after the swap, if I didn't have him to the whole job entirely.
My 2000 MN6 is at 460RWHP. I have been thinking about a gear change to provide some extra excitement; as well as upgrading the brakes. I'm embarrassed to say I've never even checked to see what ratio my car came with stock; but I think it's 3.42, correct?
Last edited by Sydwayz; Nov 1, 2016 at 03:37 PM.
Melting Slicks
Joined: Jan 2014
Posts: 2,764
Likes: 375
From: Central Florida
1) I like this idea. I just bought a 4 post lift, and could probably make a winter project out of this. I could buy a used differential, have it gone through, and swap it out keeping my stock setup intact; correct?
2) Where does the speedometer pick up it's signal? Is this something I can have my tuner adjust after I do a swap? Or is there a mechanical change I need to do somewhere? I'd likely have it retuned anyhow after the swap, if I didn't have him to the whole job entirely.
My 2000 MN6 is at 460RWHP. I have been thinking about a gear change to provide some extra excitement; as well as upgrading the brakes. I'm embarrassed to say I've never even checked to see what ratio my car came with stock; but I think it's 3.42, correct?
2) Where does the speedometer pick up it's signal? Is this something I can have my tuner adjust after I do a swap? Or is there a mechanical change I need to do somewhere? I'd likely have it retuned anyhow after the swap, if I didn't have him to the whole job entirely.
My 2000 MN6 is at 460RWHP. I have been thinking about a gear change to provide some extra excitement; as well as upgrading the brakes. I'm embarrassed to say I've never even checked to see what ratio my car came with stock; but I think it's 3.42, correct?
Last edited by Forcedvert; Nov 1, 2016 at 07:46 PM.
Le Mans Master
Joined: Sep 2000
Posts: 6,098
Likes: 43
From: ABQ NM
Cruise-In II Veteran
mpetty, unless you're simply hankering to do this work yourself, drive up to RPM transmissions (just outside of Indianapolis) and let them do it for you. They'll be done within a day, and you'll be on the road back home.
While it's been several years since I was at their shop, I was amazed at how quickly they are able to do this sort of work. Good luck whatever you decide to do.
While it's been several years since I was at their shop, I was amazed at how quickly they are able to do this sort of work. Good luck whatever you decide to do.
Pro
Joined: Oct 2004
Posts: 734
Likes: 45
From: Over in the UK
Hi all I have an auto 99 car, currently a 3.15 I believe.. And have custom Diablo Intune , so shift points moved, firmness etc...
Would I see good performance benefit going to say 3.73 or 3.90 built box? Just drop in and go? No other mods?
Seem to remember reading one if the reasons the Z does sub 4 secs to 60 is gearing in its manual box..
Something like an RPM built one or similar?
Would I see good performance benefit going to say 3.73 or 3.90 built box? Just drop in and go? No other mods?
Seem to remember reading one if the reasons the Z does sub 4 secs to 60 is gearing in its manual box..
Something like an RPM built one or similar?
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Le Mans Master
Joined: Sep 2014
Posts: 5,278
Likes: 539
From: Kelowna BC
Going to 3.73 or 3.90 would be a great move, so long as you're okay with higher highway RPM's. 3.42 wouldn't be worth the change IMO.
The Z also has steeper rear gears (3.42), 130# less weight to push, wider tires, and around 60 more ponies (among other small niceties).
The Z also has steeper rear gears (3.42), 130# less weight to push, wider tires, and around 60 more ponies (among other small niceties).
Last edited by grantv; Nov 9, 2016 at 01:58 PM.