95 tranny - Page 2 - 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 02-11-2005, 11:14 AM   #11
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Quote:
Originally Posted by jr's3800
Quote:
Originally Posted by 1997_LeSabre
jr3800, my replacement trans came from a 1997 Olds 88, which also has the same 7ASW 4T60E as a 1997 Bonneville n/a. There'* no difference in durability from a Buick/Olds/Pontiac on the parts they share. In the case of the transmission (and just about all of the steering, suspension, engine, exhaust), it'* the same part #* across the H body platform. I don't think your 95 has the pulsewidth modulated TCC lockup (which GM set up to make smoother engagement of the TCC. It basically induces controlled slippage during lock and unlock so you don't feel the engagement. This also makes the TCC a very weak point of my 1997 model year 4T60E. ) THAT is why your transmission is still in one piece.
This is the kind of info I like... I'm pretty sure as well that my car does not have the PWM TCC lockup...

Hmm well scratch that... Looking at the service manual, it shows the black wire in the 7 pin connector as the PWM solenoid..... Hmmmm

...
I am in the process of preparing my engine and trans for installation back into my '95, and I wanted to see if I could address the slip into TCC lockup that I felt when I test drove my "new" used trans. I intend to change out the turbine shaft seal for sure, will probably swap torque converters, and if it is not too difficult I am toying with the idea of changing all the turbine shaft seals and maybe swapping the TCC and PWM solenoids from the old trans..

I spent about 20 minutes with the parts guy who was kind enough to give me printouts, part numbers, and prices for these parts for my '95 SLE. They clearly show a PWM solenoid (8683535: $75.64) for my trans. A PWM solenoid is also shown and described in my '92 FSM. So, I still don't know what makes the '95 Bonneville a "year and make specific trans," but I don't think it is the use of the PWM solenoid.

I do believe that the trans cannot be swapped with others successfully for a simple reason. Honest junkyards will tell you that it is this way. The Car-Part.com search engine will also show you this when you search. These are the people who stand most to profit from interchangeability, and they will not recommend it. We would just like to know WHY we can't do it! Or what we need to change to make it work.
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Old 02-11-2005, 12:26 PM   #12
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i think that it all comes down to matching up the # from the orignal trans to the new one. If they match they you have a winner, anything else is up to chance. I think alot of smaller people/parts yards dont know about the interchangeability of the trans.....
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Old 02-11-2005, 12:29 PM   #13
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every trans with a different model number has slight variations on what is used inside of them. for instance, on the L60, it can change the following:

valves in valve body
input shaft
torque convertor
stator shaft
output shaft
reaction carrier
input carrier
bell housing
boost solenoid
boost sleeve

and that'* just off the top of my head. there'* also different band apply servos, and things of the like. and i'm sure there are things that after almost three years, I still don't know about. It would take a good long time to make a list of everything that'* different between models...
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Old 02-11-2005, 12:31 PM   #14
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Quote:
Originally Posted by mkaake
every trans with a different model number has slight variations on what is used inside of them. for instance, on the L60, it can change the following:

valves in valve body
input shaft
torque convertor
stator shaft
output shaft
reaction carrier
input carrier
bell housing
boost solenoid
boost sleeve

and that'* just off the top of my head. there'* also different band apply servos, and things of the like. and i'm sure there are things that after almost three years, I still don't know about. It would take a good long time to make a list of everything that'* different between models...
that would be huge
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Old 02-11-2005, 12:33 PM   #15
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yup. kind of helps to explain how the same transmission that is in an H2 is in a corvette, huh? They're technically the same trans, but the similarity ends somewhere after the powerflow and how it works...

i'll see if i can dig up a list of what was different on those years for the t60, but don't get your hopes up...
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Old 02-11-2005, 12:35 PM   #16
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Quote:
Originally Posted by mkaake
yup. kind of helps to explain how the same transmission that is in an H2 is in a corvette, huh? They're technically the same trans, but the similarity ends somewhere after the powerflow and how it works...

i'll see if i can dig up a list of what was different on those years for the t60, but don't get your hopes up...
I know that finding info on the 60 and the 65 is a hugh task, the trans and the info is like a secret at GM
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Old 02-11-2005, 12:41 PM   #17
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i have no problem with secrets, the problem is with age

a lot of the stuff that was done in 95 never found it'* way to the intra-net... they weren't nearly as computer dependant then. so while it'* possible that the records are out there somewhere, there'* always the possibility that the information you want to know is on a single piece of paper in a drawer in some guy'* cabinet that hasn't been cleaned out in 4 years...

that'* the most challenging part. stuff from about 98-up is easier to get a hold of - a lot of it is on the intra-net. not all of it though...
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Old 02-11-2005, 01:51 PM   #18
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the quick search yielded this info for the 99 t65. gettin closer...

RPO Difference:

M15: 245mm torque converter

MN3: 258mm torque converter

MN7: 258mm torque converter and heavy-duty gearbox

now keep in mind, generally speaking, a different torque convertor means a different stator shaft and input shaft, depending. this info was part of a broad overview. i'll see if i can get more detailed info...
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Old 02-11-2005, 03:34 PM   #19
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Quote:
Originally Posted by jr's3800
Bill from what I can gather the 1994,1995 and 1997, I'll assume 1996 4T60-E as well, are all Pulse Width Modulated, and frome what I can gather they all have the same pinouts..

In a few days if you like I'd be more than happy to scan and send you some info
You bet! Knowledge is power. I would appreciate learning more. Thanks, Don.
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Old 02-11-2005, 03:40 PM   #20
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Quote:
Originally Posted by bill buttermore
Quote:
Originally Posted by jr's3800
Bill from what I can gather the 1994,1995 and 1997, I'll assume 1996 4T60-E as well, are all Pulse Width Modulated, and frome what I can gather they all have the same pinouts..

In a few days if you like I'd be more than happy to scan and send you some info
You bet! Knowledge is power. I would appreciate learning more. Thanks, Don.
I know for an unquestionable fact, that a '94 transmission will work in a '95. I know this because I have a '94 4T60e-HD in where my '95 4T60e-hd should be. Mines from a '94 L67 car. Hooked right up. Working great!
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