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**** 4.083 Gears/Final Drive Installed****

Old 12-23-2014, 12:54 AM
  #901  
ordinaryme
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where do you guys buy these gears? Z1 seems to have reasonable pricing but they don't answer e-mails maybe they're already on christmas holiday.

Tomei makes also final gears, but are they really worth extra buck?

(Tracking and drifting 50/50 and my Z is sc (hr))
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Old 02-07-2015, 07:15 AM
  #902  
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Originally Posted by ordinaryme View Post
where do you guys buy these gears? Z1 seems to have reasonable pricing but they don't answer e-mails maybe they're already on christmas holiday.

Tomei makes also final gears, but are they really worth extra buck?

(Tracking and drifting 50/50 and my Z is sc (hr))
408 is for na z's. Unless you drive around on slicks or 305 wide drag radials then 408 would be a waste in a sc z. No traction. Z1 answers emails like a week later then went you send them.
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Old 07-17-2015, 11:40 AM
  #903  
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Any thoughts on 4.08 on a NA revup with manual? I saw someone ask a few posts back with no real input.
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Old 07-17-2015, 12:27 PM
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Originally Posted by Hotlaprc View Post
Any thoughts on 4.08 on a NA revup with manual? I saw someone ask a few posts back with no real input.
I had them on my 06, you can tell the difference with acceleration and was certainly fun to spin tires in 1-3/4. I bought a new Z recently and probably will not be doing this mod. Saving for that turbo
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Old 09-15-2015, 03:01 PM
  #905  
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Default 4.08 FD/Stock Diff

Hey guys, not trying to bring up an old thread here but I have a question. I have a bone stock, 35th Anniversary (minus K&N drop-in filter which I don't count as a real mod ha.) I've had my car for a little over a year and put 22,000 miles full of grins and giggles. But, the time has come where I just can't leave it alone. I don't want to change anything more than what I have to because I think a bone-stock 35th Ann. could be a nice collector's item in the future once all of the others are heavily modded, riced out, or wrapped around a tree.

The 35th Ann. if you aren't familiar with it (I assume anyone who's opinion counts on here is aware of this but just to make it clear) has the DE Revup and stock Vicious LSD.

My question is this: Would I probably be okay if I kept the stock diff and just dropped a set of 4.08s in the rear end? I drive it mildly-spirited at most times as I'm over the burnout/donut stage in my young life but still "lay into it" sometimes. I'd just like some more low end grunt, and I don't do any auto-x and have only taken my car to the strip a couple of times with no plan to make a race car out of it.

Money is fairly tight and will be for the next couple of years until I land an engineering job, so if an aftermarket diff is absolutely crucial for my car and relatively normal driving habits, I'll just toss the idea out the window.

P.S. I know I don't have any posts (maybe a few but I'm not real sure), but I wouldn't consider myself a noob to the car world, so please don't roast me if at some point this question has been asked an I overlooked it in the 46 pages of this thread.

Thanks guys!
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Old 09-15-2015, 04:00 PM
  #906  
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I would recommending buying a spare pumpkin to build then swap in...

If you plan on keeping it mostly stock having a known good spare will help...especially in a jam !

Last edited by KingBaby; 09-15-2015 at 11:28 PM.
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Old 09-15-2015, 04:24 PM
  #907  
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If you put 22k miles on your car in a year im going to guess most of that was on the highway. I would think your best leaving your gears stock if you put that kinda mileage on the car. What is the cruising rpm on the highway like 3k rpm+
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Old 09-15-2015, 04:39 PM
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Originally Posted by KingBaby View Post
I would recommending buying a soar pumkin to build then swap in...

If you plan on keeping it mostly stock having a known good spare will help...especially in a jam !
By "soar" do you mean just another cheap stock pumpkin to "build" and then just keep my VLSD for when/if S#!T hits the fan? Thanks for the response!
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Old 09-15-2015, 04:41 PM
  #909  
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Originally Posted by dboyzalter View Post
If you put 22k miles on your car in a year im going to guess most of that was on the highway. I would think your best leaving your gears stock if you put that kinda mileage on the car. What is the cruising rpm on the highway like 3k rpm+
Actually, I hardly ever go on the highway, believe it or not. I just drive to random scenic spots here in Arkansas which I can normally get to by city streets and then scenic/curvy roads. I just love driving! Thank you for your input though, I appreciate it!
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Old 09-15-2015, 05:27 PM
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Originally Posted by bertaman1 View Post
Actually, I hardly ever go on the highway, believe it or not. I just drive to random scenic spots here in Arkansas which I can normally get to by city streets and then scenic/curvy roads. I just love driving! Thank you for your input though, I appreciate it!

You got it. I would keep my stock differential and buy a used one to build or get an already built used one. Their are a few in the marketplace bolt in ready for about $1000. The parts to build it yourself will probably be little more. I think the added acceleration would be a enjoyable mod.

I hope someone chimes in with what rpm the car cruises at on the highway im curious.
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Old 09-15-2015, 05:42 PM
  #911  
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Originally Posted by dboyzalter View Post
You got it. I would keep my stock differential and buy a used one to build or get an already built used one. Their are a few in the marketplace bolt in ready for about $1000. The parts to build it yourself will probably be little more. I think the added acceleration would be a enjoyable mod.

I hope someone chimes in with what rpm the car cruises at on the highway im curious.
I'll definitely check out the marketplace. As to the cruising RPM, I'm pretty sure there's a thread on this somewhere that I ran across during my research for this little project. I'll see if I can find it.
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Old 11-01-2015, 05:21 PM
  #912  
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Any come up with the rpm's for 6th gear about 70mph cruising? With the 4.08 gears vs the 3.9s thanks.
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Old 11-02-2015, 02:57 AM
  #913  
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Originally Posted by dboyzalter View Post
Any come up with the rpm's for 6th gear about 70mph cruising? With the 4.08 gears vs the 3.9s thanks.
Otherwise stock 2005. 4.083 gears at 70mph=3050 or so rpm (one needle width past 3000). At 75mph it is 3250 exact.
I've got stock tire size.
Any other rear end ratio can be figured from this data. 3.9 gears at 75 should be 3104 rpm.
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Old 05-14-2016, 03:31 AM
  #914  
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Where is everyone buying their pinion shim sets from? Im in the middle of installation and the factory shim is too thick.
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Old 05-14-2016, 03:37 AM
  #915  
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Originally Posted by Q8y_drifter View Post
Where is everyone buying their pinion shim sets from? Im in the middle of installation and the factory shim is too thick.
I don't think they make sets. I put my gears together and made an educated guess which one I needed. I then went to my local dealer and bought two different shims that were close and got lucky that one guess was right.
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Old 05-14-2016, 04:42 AM
  #916  
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Pretty sure you can get them from Z1 dont know how long the trip to Kuwait would be though.
https://www.z1motorsports.com/advanc...ferential+shim

Last edited by dboyzalter; 05-14-2016 at 04:44 AM.
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Old 03-08-2017, 02:37 PM
  #917  
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I'm willing to buy stock ring and pinion if somebody is willing to sell one cheaply!
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Old 07-17-2017, 02:59 PM
  #918  
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http://www.f-body.org/gears/

No longer works.

Anybody have a new one?
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