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V8 and V6 Transmissions / Driveline (6L80 / 6L50 / TR6060 / AY6) Driveshafts | Differentials | Gears | Rearends | Clutch | Shifters

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Old 08-14-2014, 08:51 PM   #1
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Rear end let go at track

Well I had my best 60ft tonight at track 1.430 on my 6spd. Heard a pop let out of throttle cruised home. Lifted car on jack stands axles still good drive shaft still good. I can hear a grinding noise wheels want turn . Anybody ever broke AAM 3.91 gears before?
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Old 08-14-2014, 09:17 PM   #2
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I'd be surprised if it was the gear itself that let go, AAM is the same as the GM gears.

How much torque are you making?
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Old 08-14-2014, 09:19 PM   #3
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640rwhp and 670rwtq on Nitrous
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Old 08-14-2014, 09:20 PM   #4
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I drove it home 12miles if it was drive shaft or axles I couldn't have done that so I'm thinking it has to be teeth broke off ring and pinion
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Old 08-14-2014, 10:18 PM   #5
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Man I hate I missed you..How did you get that 60..must have had a sharp guy helping you.....lol
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Old 08-14-2014, 10:33 PM   #6
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H-E You was spot on bro my car felt like a rocket off the line. I just have to figure out the damage to that ring and pinion. That car is tough as nails I got all the way home before it wouldn't go in reverse . What's your opinion on how to get a beefier ring and pinion
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Old 08-15-2014, 01:26 AM   #7
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One of your main bearings prolly let go. Thats what happened to mine. Assuming thats what happened, youre in for a total build, or an upgrade.
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Old 08-15-2014, 02:18 AM   #8
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376LS3 what did you end up going with rebuild or upgrade and what's the damage cost wise I'm looking at. Will ZL1 differential work in our cars?
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Old 08-15-2014, 02:25 AM   #9
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Ya, the ZL1 diff will work with small tweaks on your end. Its the best option for the money. Hindsights always 20/20, and I wish everyday I would have done the ZL1 diff instead of trying to bulletproof the stock diff. My problem was it being setup incorrectly. I had them build a stock diff with 3.91s, TruTrac, JRE billet endcaps, PFADT bushings. Long story short, the diff gave out at 15mph 800ft from my house. They didnt machine the endcaps to the correct bore, even though they charged me for it. $2700 pissed down the drain.
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Old 08-15-2014, 02:28 AM   #10
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Whoa that's a lot of cash for upgrade and still have problem. I have DSS 1000hp axles will the ZL1 differential work with those.
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Old 08-15-2014, 02:33 AM   #11
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No. You have the buy the entire kit. Diff, axles, and driveshaft. Nothings compatible.

http://www.jegs.com/i/Chevrolet-Perf...05#moreDetails
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Old 08-15-2014, 02:35 AM   #12
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Do you have parts list for upgrading the stock differential that's more in my price range
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Old 08-15-2014, 02:35 AM   #13
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So basically I had $2700 in the diff, $1100 for axles, and $900 for a driveshaft. Then I had to spend another $1700 for a new 1LE diff when that one crapped out. Coulda put a 9" in!
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Old 08-15-2014, 02:38 AM   #14
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Quote:
Originally Posted by GTKILLER View Post
Do you have parts list for upgrading the stock differential that's more in my price range
Ya, let me find all my links to make it easier on ya.
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Old 08-15-2014, 02:40 AM   #15
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Axles and driveshaft is still in good shape so basically I need 1LE diff and I'm back racing again
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Old 08-15-2014, 03:52 AM   #16
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Thats definitely the easiest way to do it. That way you dont have to worry about some shops craftsmanship. Supposedly these diffs are different to setup vs solid axle. Dont know the difference, but a lot shops shy away on them. The 1LE diff is so cheap and built by GM. Its no stronger than a 3.45 diff, but then again, building up a stock diff is only buying you time.

1. Buy extra diff to have built.....(If you choose)
2. AAM 3.91 gear
3. Install kit - Various manufacturers. I went with the Lingenfelter full kit, and then bought every bearing that wasnt included in the kit from GM. (Used diff)
4. Axle seals
5. Eaton Trutrac
6. Diff bushings of your choosing. I went with PFADT.
7. JRE billet endcaps - THEY NEED TO BE MILLED TO EXACT SPECIFICATIONS!!!!
8. Girdle diff cover - Optional since you upgraded the endcaps. Really not worth it.
9. 75w-140 NON-synthetic oil
0. Cover gasket
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Old 08-15-2014, 03:56 AM   #17
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Does the 1LE differential have a better posi traction unit like the Eaton Trutrac or is it basically same as SS
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Old 08-15-2014, 03:58 AM   #18
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Its the exact same except it has the 3.91 gear. The Z/28 has a better posi unit, but I think thats on their "no buy" list.
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Old 08-15-2014, 04:00 AM   #19
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Dang I didn't want to hear that so if I leave hard at track again it has the potential to break again. So the cheap way ain't gone work
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Old 08-15-2014, 04:14 AM   #20
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I would open yours up and see what failed first. Then decide where to go from there. If you race religiously, I would upgrade the stocker, or step up to the ZL1, Hammerhead, or 9". Gotta pay to play!
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Old 08-15-2014, 04:20 AM   #21
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Lol your right
The Jannety Rearend upgrade that has to be better than stock or 1LE
Have you heard if that setup can handle dragstrip
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Old 08-15-2014, 04:30 AM   #22
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The upgrade isnt going to add strength, its just going to almost guarantee you will never get the one-wheel-peel. If you're going to do it, do it right. TruTrac and endcaps. At 640whp, you might just wanna do a ZL1. Once you bulletproof the stocker with Trutrac and caps, the weak part becomes the aluminium case. If you're really cutting 1.4x 60'ft times, I wouldnt phuck around and just get the ZL1. I dont think anyone has broken a ZL1 diff yet.
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Old 08-15-2014, 04:33 AM   #23
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Your right I've tried to go the cheap get back to the track route but I'm going to have to get it done right
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Old 08-15-2014, 04:40 AM   #24
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Ya. I took my diff to a different shop to have them look at the carnage and they said the TruTrac should be ok. They ultrasonic'd it, so I guess we'll see. I just dont have the money now to fully rebuild it again. Then my oil pump went out last week, so now I have to also build another engine. I love cars....I think. Lol!
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Old 08-15-2014, 04:52 AM   #25
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Wow so I ain't the only one spending money. Bad thing was I was getting ready to sell my Nitrous setup and go supercharger but that's on hold until I figure out this rear end ordeal
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