4th gear gone at 115,000 miles - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-09-2005, 11:08 AM   #1
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Default 4th gear gone at 115,000 miles

Just returned from having tranny checked for problem that appeared at first to be the torque converter. I noticed my gas mileage had dropped considerably, now I know why.
Driving down the road at 60, the tack read 3000rpm. Went to some transmission places and got quotes to rebuild. Rebuilding mine would run between $1800 to $2000 with 12 month 12,00 mile warranty. The dealership can put in a new one for $2980 with a 5 year 100,000 mile warranty which would cover anything in the future.
BTW, I had the full flush done about six months ago but hesitant to blame that.
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Old 11-09-2005, 12:40 PM   #2
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Sounds like the flush may have done it in. I had my transmission rebuilt at about 119k in my 94. It was no fun to pay the money, but the trans was fantastic after that

I have heard of others here that have had the flush, and tranny failure soon followed. Maybe, the flush removed some of the build-up that was helping to hold the trans together?
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Old 11-09-2005, 01:09 PM   #3
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Did the shop say what the actuall cause of failure was?

It seems its getting common for the 4T65-E to have a 4th gear failure where the 4th gear splines are chewed off leaving you without 4th... In some of the worst cases, the Torque converter died shortly after 4th gear was lost...

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Old 11-10-2005, 08:54 PM   #4
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Follow up to fixing tranny.
Talked to my son and he has had the tranny on his Blazer 4 wheel drive done by a guy that is very reliable. He does most of the 4 wheelers in the Charlotte area.
I talked to the tranny guy and he can do a complete rebuild for $1800 (it would have been $1400 but the 4T65-E is electronic). He says the life span on these trannies is about 85,000 miles, most failures are 4th gear. He gets the rebuild kit from an outfit in California that specializes in these type transmission kits. Will have to get the name of the company tomorrow when I drop the car off.
Since I plan on keeping the car for only another two years or so, could not justify the new tranny at $3000, with a five year, 100,000 mile warranty offered by the local Pontiac dealer.
According to the guy, the kit will include torque converter, electronics, 4th gear splined shaft, valves and other amenities to do a first rate rebuild.
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Old 11-10-2005, 09:07 PM   #5
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Bingo 4th gear splined shaft have him give it to you when he is finished and you will see why you have no 4th

Even if you keep it 2 years ask him to replace the stove pipe (reverse reaction drum) with a hardened one they only cost $20-30 and are common to leave you sitting
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Old 11-10-2005, 09:20 PM   #6
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jbbiggs;
thanks for the heads up on stove pipe. Will talk to him about it tomorrow.
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Old 11-10-2005, 11:04 PM   #7
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Only 85,000 miles? That sounds very premature for one to go out. All the transmissions are electronic in an 87+ Bonneville.

I have 135,000 on my 99 and it shifts great. And I've done lots of towing/abuse on it. But, I've never had a transmission flush. I'm going with the fact that your flush caused the failure.
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Old 11-11-2005, 12:33 PM   #8
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Quote:
Originally Posted by vital49
Only 85,000 miles? That sounds very premature for one to go out. All the transmissions are electronic in an 87+ Bonneville.

I have 135,000 on my 99 and it shifts great. And I've done lots of towing/abuse on it. But, I've never had a transmission flush. I'm going with the fact that your flush caused the failure.
Not all of them do it, and it doesn't always seem to have anything to do with a flush...

We have seen a series of the 4T65-E'* die an early death over the years... Its almost common...

Its odd that we will see 4T60-E'* that manage 100,000+ miles before any issues... I have seen many past 150,000 and still going strong... I have seen a few well beyond 200,000...

We have seen a few 65'* do the same... But even with the 4T60-E'* failing, most with decently high milage, we seem to be having more 65-E failures... But a good quality rebuild usually corrects for most of those problems..

143,000 on my 60-E and its still going strong( I have been very abusive )
124,000 on the 440-T4 and its still going strong( been abused as well )


The THM440-T4 a.k.a. 4T60 for 90-91 was a fully hydraulic unit with the exception of the TCC solenoid...

The 4T60-E which came out in 91, was used in the Bonneville starting in 1992... The 60-E has 2 shift solenoids, and a TCC solenoid, some have a PWM solenoid..

The 65-E used in the 97 SC Bonnevilles, and all 98 and later bonnevilles, was a totally electronic unit, No vacume actuated Modulator as was present on the 60-E... The Puter took care of all of the transmissions functions, right down to shift quality...

Making any sense

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