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View Poll Results: When did you have your first trans REPAIR?
92-97 4T60E (non HD) 0-75k miles 3 4.48%
92-97 4T60E (non HD) 75-100k miles 4 5.97%
92-97 4T60E (non HD) 100k or more 24 35.82%
92-96 4T60E (HD-Supercharged) 0-75k miles 1 1.49%
92-96 4T60E (HD-Supercharged) 75-100k miles 0 0%
92-96 4T60E (HD-Supercharged) 100k or more miles 14 20.90%
97+ 4T65E (non HD) 0-75k miles 2 2.99%
97+ 4T65E (non HD) 75-100k miles 3 4.48%
97+ 4T65E (non HD) 100k or more miles 7 10.45%
97+ 4T65E (HD-Supercharged) 0-75k miles 3 4.48%
97+ 4T65E (HD-Supercharged) 75-100k miles 6 8.96%
Voters: 67. You may not vote on this poll

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Old 10-19-2005, 10:50 PM   #31
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My 95SLE made it 172K before failing.
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Old 10-20-2005, 11:04 PM   #32
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I had two significant transmission fubars. I have forgotten some of the details but:

2003 SSEI
22k miles - Pressure Plate goes - replaced
27k miles - Whole transmission goes - only 3rd gear left when drving to the dealer - new trans

Am I the only one that thinks these kinds of problems are unacceptable for a car costing this damn much?
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Old 10-20-2005, 11:16 PM   #33
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4T60E-HD (1996 SSEi) w/ 103,000 miles on it and not showing any signs of a problem.

1997 SE had 98,000 problem free miles on it before it was totaled.
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Old 10-21-2005, 12:07 AM   #34
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i have not personally done the trans in my car but i know the previous owner did shortly before i bought it so i voted for 100k+
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Old 10-25-2005, 07:41 AM   #35
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my repair was at 149,000 the lines come back from the tranny cooling broke. That is the only thing that I have done to tranny. Other then fluid change
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Old 10-25-2005, 03:15 PM   #36
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I also have another vote for a 4T65E that FAILED - '99 Grand Prix GT - 77,xxx miles.
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Old 10-25-2005, 03:29 PM   #37
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Ok, I think I have enough inputs to put something together, and the proper corrections to make it valid. Keep the data flowing for those that haven't so far, and remember this is for a trans that has FAILED for some reason.

We'll do another poll for those that are currently running, and see how they're holding up.
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Old 10-25-2005, 10:23 PM   #38
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Based on this poll, after corrections were made, and factoring in the response rate for each trans type (4 total), and a total of 28 transmissions analyzed (some had more than one):
Quote:
All but one 4T60E made it over 100k before first failure (12 over 100k, 1 between 75-100)
All 4T60E(HD) made it over 100k before first failure (8 total)

Both 4T65E transmissions listed failed under 75K

Of the 5 4T65E(HD) transmissions, 3 failed under 75k, and the other 2 failed before 100k.
According to the trans shop that rebuilt the Zilla'* 4T60E(HD), they typically see a 3:1 failure rate comparing the 65 to the 60 (4T65E is 3 times as likely to fail than the 60). Most 65E failures they see are under 75k (which is why I used that benchmark in the poll).

450,000 92-96 Bonnevilles were produced with the 4T60E or 4T60E(HD)

Roughly the same number of 4T65E or 4T65E(HD) were produced from 97-2005 (even though this is a 9-year period of production, the numbers are offset by lower production each year).

Adjusting the numbers to make even samples of each major type, the following conclusion can be made (based on the data we collected):

Quote:
A 4T65E or 4T65E(HD) is twice as likely to fail under 100k miles than a 4T60E or 4T60E(HD).

While trying to rationalize this, try to remember that even though the Series 2 develops more power, the Series 1 develops it in a more dangerous 'range'. And the 1996 Series 2 L67 mated to the 4T60 trans doesn't see the same failure rates as the newer cars with the 65.

After watching the trans failures over a period of 3 years on this forum, this is about what jr's3800 and I expected to find from this simple poll. Consider this a small sample size, but over 3 years, the trend is there as well.
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Old 10-27-2005, 06:35 AM   #39
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1st at 110k major diff case cracked bent Diff pin and such put in junkyard one with 108k
2nd 115k diff cracked put in brand new Reman
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Old 11-01-2005, 05:44 PM   #40
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so what you're saying bill, is that everyone should swap in the 60 right?
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