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First pass with YSI = broke 6l80 case

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Old 02-16-2017, 11:49 PM   #21
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Originally Posted by DEE_Vette
I had same issue... Built 6L80... First pass 1.56 60ft, 10.24, 135mph... 2nd pass broke 6l80... Output shaft shear off inside trans and it took out the Z06 Rear end... Car didnt wheel hop... Have your trans tune checked...
That's pretty crazy. I made at least 50 passes close to those times with a stock trans and never broke that shaft.
Broke lots of other stuff though. LOL.
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Old 02-17-2017, 12:09 AM   #22
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That's pretty crazy. I made at least 50 passes close to those times with a stock trans and never broke that shaft.
Broke lots of other stuff though. LOL.
Who you telling its crazy... Expensive "Built" Trans with their tune in it... put in virgin stock trans... Had Pat G. Tune it... 1.45 60ft, 9.80 139mph no issue...
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Old 02-17-2017, 12:10 AM   #23
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Did the shaft break on the launch ??
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Old 02-17-2017, 12:26 AM   #24
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[QUOTE=realcanuk;1594111315]Did the shaft break on the launch ??[/QUOTE

Bout 300ft mark... felt like it went to neutral...
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Old 02-17-2017, 10:57 AM   #25
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Broke output shaft. Diff seems good just need to weld ears back on. I will tear it apart to verify.
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Old 02-17-2017, 10:58 AM   #26
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More pics
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Old 02-17-2017, 10:59 AM   #27
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Another
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Old 02-17-2017, 12:22 PM   #28
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Yes sir.... Broken Ears look Identical to mine when it broke...
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Old 02-17-2017, 12:54 PM   #29
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Old 02-17-2017, 01:21 PM   #30
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When you open it up, you will see it sheared off of the rear planetary...
Did you have any wheel hop...???

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Old 02-17-2017, 01:24 PM   #31
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That sucks cause I don't believe anyone makes an upgraded part for that. I have a billet intermediate shaft but stock output.
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Old 02-17-2017, 01:30 PM   #32
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Nah no wheel hop ever. Diff had 1300 miles on it and I put 2200 miles extra on it and 12-15 passes (mostly 1/8th). Was actually pretty tame on the street for the most part as I don't tend to street race (haven't ever with the Vette). Trans only as 23xxx miles on it.
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Old 02-17-2017, 01:35 PM   #33
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Just trying to figure out why this would happen without wheel hop.

Do you have stock mounts on it ? Thinking maybe too much flex. ??
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Old 02-17-2017, 01:39 PM   #34
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Quote:
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That sucks cause I don't believe anyone makes an upgraded part for that. I have a billet intermediate shaft but stock output.
Right... No upgraded part for that... I had the billet intermediate shaft too, along with all the other upgrades...

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Nah no wheel hop ever. Diff had 1300 miles on it and I put 2200 miles extra on it and 12-15 passes (mostly 1/8th). Was actually pretty tame on the street for the most part as I don't tend to street race (haven't ever with the Vette). Trans only as 23xxx miles on it.
I know it Sucks... Dont feel bad... My Trans was "Built" and had about 600 miles on it and was on the second pass...
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Old 02-17-2017, 01:47 PM   #35
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Nah I don't feel bad I came from the world of 1000whp FWD cars so I know about breaking stuff lol.
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Old 02-17-2017, 02:06 PM   #36
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Can never feel bad.. its part of the game. But it would be nice to figure out how to possibly avoid this... or at least lesson the chances.

Ive broken axles, and diff shafts, but never a hard part in the trans.. Maybe our crappy track that doesn't hold well was saving me. I dunno.
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Old 02-17-2017, 03:10 PM   #37
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Called RPM about a 4L60 conversion and I can't ball that hard. Talked to Century and they're gonna send me an email with a list of upgraded parts. That's most likely what will happen. Mike from Century sad he's only seen 3 main shaft failures so they haven't had a reason to develop an upgrade for it.
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Old 02-17-2017, 03:13 PM   #38
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Called RPM about a 4L60 conversion and I can't ball that hard. Talked to Century and they're gonna send me an email with a list of upgraded parts. That's most likely what will happen. Mike from Century sad he's only seen 3 main shaft failures so they haven't had a reason to develop an upgrade for it.
Yeah.. looked into the 4L60 swap.. too much money for a trans that seems to not hold up that well anyways. I guess its upgrade whatever we can and hope for the best.
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Old 02-17-2017, 03:45 PM   #39
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Dont know what type power you are putting to the wheels.... I don't think its the parts inside them... TUNING, Tuning, tuning... Find somebody that really knows... Tuners and Builders are killing the trans... Even the "Built" ones... Contact Pat G.

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Old 02-17-2017, 04:37 PM   #40
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Not sure on the blower but made mid 7s on turbo.

I've spent countless hours studying 6l80e tuning and trying stuff on my car. I feel I have a pretty good handle on it. Not saying there isn't room for improvement but I feel confident in my 6l80 tuning skills at this time. I do agree Pat G is great at what he does though.
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