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Old 09-27-2011, 12:19 AM   #1
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Limited Slip Differential?

Does anyone know what type of diff we will get? Clutch pac, cone or gear type?
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Old 09-27-2011, 08:28 AM   #2
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Does anyone know what type of diff we will get? Clutch pac, cone or gear type?
I bet it'll be an Eaton clutch-type. Gear is too noisy and do they even use the cone-type anymore? I honestly don't know though - I'm taking a stab in the dark. I'm just hoping for a 14-bolt 9.5" ring gear that's been speculated since the Spring. The current 8.75" isn't bad, but that +4000 pound 580 horse' beast is really going to need some girth to survive all those 4K launches on a prep'd track!

I thought I'd leave a few pics' of the diff' from the Plant Tour this past Spring:
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Old 09-27-2011, 05:48 PM   #3
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Although not the greatest the cone type was used on the '04-'06 GTO. Gears may be a bit noisy however they are less maintenance over the long haul.
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Old 09-28-2011, 01:38 AM   #4
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I will be having this 9.5" unit from Lingenfelter installed it has a Tractite Helical Gear Limited Slip Carrier it also comes with 1400HP axles but the stock ones should work
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Old 09-28-2011, 08:40 AM   #5
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Although not the greatest the cone type was used on the '04-'06 GTO. Gears may be a bit noisy however they are less maintenance over the long haul.
AH!!! THANKS!!! The last car I noticed had a cone-type was 3rd Gen Firechicken, I think... Thanks for getting me up to speed

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Originally Posted by payne.jeremy82 View Post
I will be having this 9.5" unit from Lingenfelter installed it has a Tractite Helical Gear Limited Slip Carrier it also comes with 1400HP axles but the stock ones should work
I had been looking at that since it was teased a while ago. While I'm not trying to take anything away from Lingenfelter, ZL1 will come with a strengthened iron differential case, and I'd seen the mention of a 14-bolt from the factory tours. AAM, who makes Lingenfelter's diff', is generally the same company that GM uses for a lot of their SRAs. If you look for reference to 14-bolt ring gear sizes, they start as much as 9.5" in diameter. These were used in "heavy" half-tons and "light" three-quarter ton trucks 14-bolts go as high as 10.5" in diameter if I remember correctly, so if we see a 9.5" in ZL1, I'm not certain, unless your power/performance goals were astronomical, that many things outside of bushing, rear diff' cover (like LPW), and axle upgrades may be necessary. I definately like Lingenfelter's case is aluminum though. Looking at all the ribbing, I'm certain it's strong as Heck, and if they use this monster in their LS9-car, then I know it's plenty strong, lol. +1200 RWHP with N20 and a stick ain't doing any favors to that rear, lol.
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Old 09-28-2011, 10:14 AM   #6
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Thanks for the comments on our Diff guys. It will be very interesting to get one of the ZL1s and weigh their iron diff in comparison to our Aluminum version to see the differences.
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Old 09-28-2011, 10:26 AM   #7
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Thanks for the comments on our Diff guys. It will be very interesting to get one of the ZL1s and weigh their iron diff in comparison to our Aluminum version to see the differences.
If I may - I respectfully wanted to say again that the differential you developed is certainly stout and an excellent product. I wasn't trying to take anything away from you guys. I'm a huge fan, and have been since I started appreciating cars

Are you guys using the same differential AAM puts in the trucks? I was just curious
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Old 09-28-2011, 11:06 AM   #8
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If I may - I respectfully wanted to say again that the differential you developed is certainly stout and an excellent product. I wasn't trying to take anything away from you guys. I'm a huge fan, and have been since I started appreciating cars

Are you guys using the same differential AAM puts in the trucks? I was just curious
We appreciate that!

No this is not the same differential. The LPE differential is a unique piece that we have done the R&D in conjunction with the manufacturer.
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Old 09-28-2011, 11:14 AM   #9
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We appreciate that!

No this is not the same differential. The LPE differential is a unique piece that we have done the R&D in conjunction with the manufacturer.
NICE!!! If that's the same diff' in your LS9 car, I'm SOLD!!!
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Old 09-28-2011, 11:16 AM   #10
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NICE!!! If that's the same diff' in your LS9 car, I'm SOLD!!!
Yes the prototype this diff was based off of is in the LS9 Black car.
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Old 09-28-2011, 11:24 AM   #11
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Yes the prototype this diff was based off of is in the LS9 Black car.
For those that don't happen to know, this +1200 RWHP car is the first 5th Gen in the 8s. That says something about this particular diff's strength.

Okay - I'm done now
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Old 09-28-2011, 01:57 PM   #12
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Old 10-03-2011, 06:24 AM   #13
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Exclamation WARNING...FOOT PROBLEMS MAY PERSIST.

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Old 10-03-2011, 12:12 PM   #14
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i heard that the diff in the ss model have had problems with it breaking at my local track. Is this a def that the zl1 will have a different diff? Bc this car is going to be a major torque monkey
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Old 10-03-2011, 01:22 PM   #15
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i heard that the diff in the ss model have had problems with it breaking at my local track. Is this a def that the zl1 will have a different diff? Bc this car is going to be a major torque monkey

This is a completely different and enhanced differential. We don't know more details than it is a larger iron case. I've seen reports from the Oshawa tour that attendies were told it was a 14-bolt (14-bolts were found in heavy half-ton, light three-quarter pick-ups, Suburbans (three-quarter ton), H2s, and even Trailblazer SSs I believe. In these applications, I found the ring gear diameter to be 9.5"; this is not the same 14-bolt off-roaders are gravitating to; those are like 10.5" ring gear diff's. We know it's patent-pending, and the ratio is going to be 3.73s (since the announcement of the A6, it's not known if it will have it's own ratio), and that's about it. The axle shafts will be upgraded, too. Don't forget the diff' cooler, too.
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Old 10-04-2011, 03:19 AM   #16
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Post FYI...

Quote:
Originally Posted by radz28 View Post
This is a completely different and enhanced differential. We don't know more details than it is a larger iron case. I've seen reports from the Oshawa tour that attendies were told it was a 14-bolt (14-bolts were found in heavy half-ton, light three-quarter pick-ups, Suburbans (three-quarter ton), H2s, and even Trailblazer SSs I believe. In these applications, I found the ring gear diameter to be 9.5"; this is not the same 14-bolt off-roaders are gravitating to; those are like 10.5" ring gear diff's. We know it's patent-pending, and the ratio is going to be 3.73s (since the announcement of the A6, it's not known if it will have it's own ratio), and that's about it. The axle shafts will be upgraded, too. Don't forget the diff' cooler, too.
I have an 08' Trailblazer (3)SS...its a 12-bolt 4.10 not a 14-bolt...I don't think anything more than a 12 was used on any of the Trailblazer SSs.

Perhaps you meant a Tahoe?
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Old 10-04-2011, 08:59 AM   #17
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I have an 08' Trailblazer (3)SS...its a 12-bolt 4.10 not a 14-bolt...I don't think anything more than a 12 was used on any of the Trailblazer SSs.

Perhaps you meant a Tahoe?
If that's the case, I stand corrected! Thank you for straightening me out I don't believe Tahoes came with 14 or 12-bolts. Honestly, because the housing looked like a 14-bolt, that's what I assumed came in your TBSS That's what happens when one assumes... Tahoes came with a more round center section while yours, and the rest of the rears I was talking about, were more angular, almost similar to a Dana-70 in a Ford. I'll see if I can find some pics'
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Old 10-04-2011, 09:19 AM   #18
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Here are some examples the 14-bolt I'm talking about, though, of course, it's not going to be the same case like ZL1 might get (again - 14-bolt has NOT been confirmed by GM yet). The first three are 9.5" 14-bolts, which I think have a good chance at getting installed, and the last, just for reference, is a 10.5" 14-bolt that the off-roaders are starting to embrace a lot. Considering SS has something like a 8.75" ring gear, I can't see GM not stepping into a size close to 9.5" for ZL1. It just seems like a half-inch increase wouldn't really be worth it, considering nearly 160 more horsepower and close to as much torque in a car I believe is easily going to get to between 4000 and 4100 pounds.
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Old 10-04-2011, 09:59 AM   #19
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All I can say is you fans sure know your stuff on these details.

I can't wait to get the final specifications and pictures, etc., of what is going into the ZL1. One thing I think I'd love to have is a FACTORY/SHOP MANUAL showing all the "how to's" regarding EVERYTHING. ZL1 Brittanica! Anybody know where best shop manual can be sourced? It would be great to have a "full" one included with every "sold" ZL1.
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Old 10-04-2011, 10:13 AM   #20
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All I can say is you fans sure know your stuff on these details.

I can't wait to get the final specifications and pictures, etc., of what is going into the ZL1. One thing I think I'd love to have is a FACTORY/SHOP MANUAL showing all the "how to's" regarding EVERYTHING. ZL1 Brittanica! Anybody know where best shop manual can be sourced? It would be great to have a "full" one included with every "sold" ZL1.
I think we used to get out manuals and microfishe (I forgot how to spell, lol - and am too lazy to look...) from Bell & Howell. You should be able to go to a dealer, and probably order a complete service manual for about $200 (we were paying like $150 more than ten years ago).

You better believe I'll be collecting all the information I can - if not here, personally. I already am, lol.
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Old 10-04-2011, 10:25 AM   #21
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I have a Trailblazer ss that my wife runs. They come with a 14 bolt 9.5" ring gear w/4.10.Eaton clutch type differential with 33 spline axle shafts.Hopefully GM done their homework like Lingenfelter did.
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Old 10-04-2011, 10:34 AM   #22
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I have a Trailblazer ss that my wife runs. They come with a 14 bolt 9.5" ring gear w/4.10.Eaton clutch type differential with 33 spline axle shafts.Hopefully GM done their homework like Lingenfelter did.
Well - not I'm a little confused. I know I've seen the 14-bolt housing but never followed-up on the ring gear diameter, so maybe the OP has the regular 1/2-ton-type, with the rounder center chunk...

Thanks for your input
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Old 10-04-2011, 10:40 AM   #23
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How about the 11.5 inch 14 bolt in the 2500 and 3500 trucks? Should be plenty stout, but may present ground clearance issues!!!
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Old 10-04-2011, 10:50 AM   #24
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How about the 11.5 inch 14 bolt in the 2500 and 3500 trucks? Should be plenty stout, but may present ground clearance issues!!!

LOL!!! That, and it's +550 pounds of girth!!! LOL!!! Actually - that 11.5 might be a little smaller, on the exterior, than the 10.5 14-bolt... Yeah... Probably overkill
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