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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