4t60e transmission swap (95 lesabre with 92 bonneville) - Need Help! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-09-2011, 12:58 AM   #1
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Default 4t60e transmission swap (95 lesabre with 92 bonneville) - Need Help!

Hello, new to the forum group but seems like there'* some good knowledge here.

I have a 95 lesabre with 4t60e transmission that went out. A while back i bought a 92 bonneville (with a good 4t60e transmission but blown motor) for a backup tranny as mine was starting to slip.

Well my lesabre'* tranny finally took a dump after a year of limping along (with chemtool fuel stabilizer added to trans). I took the trans out assuming it would be a direct swap. All bolts lined up and connectors on tranny were identical. Put it in, started car and seemed fine. Drove it to the end of the driveway and back. Next day on my way to work i took car and noticed it didnt seem to shift, got on freeway and it continued to rev and not shift. Pulled into gas station and turned off car. It wouldnt start, tried to jump and no luck. It than randomly started, seemed good again (besides shifting issue) so i drove it to car-x and had it scanned (PCM module 1 and module 2 and temp sensor) on scanner. Ok thought just needed new PCM, drove it home but engine started running worse and check engine light was flashing so i stopped at oreileys had it scanned again (P1630, P0755, P1640, P1650, P0325, P0712) codes came up, figured just need new PCM again as this controls all of the knock sensors and trans sensors.

Did some research (before and after I obtained ECM from 92 vehicle at junkyard)... Looks like i had the OBD 1.5 with 16183247 PCM but transmission wants the OBD 1 (16141470). The transmission from the bonneville doesnt have the ID tag with model info so im not sure about the gear ratio (chances to be 3.06 or 2.84) but do know that the gear ratio in the lesabre was 2.84 so the VSS Reluctor might be off (30 vs 31) and not sure what that will cause...

Does anyone know if i can rewire and cut the connectors from the OBD1.5 PCM and splice in the connectors from the OBD1 ECM. If not, can I reflash the OBD 1.5 PCM with .ads and .xdf files from the ECM to the PCM so i can leave the wiring in tact (also found .bin files)? Will the definition files from tunerpro.net be all thats needed (besides sw and cabling) to update the PCM if so? Just curious if this is an option, what sw would be required. Is there some place someone could recommend to perform this for me if possible.

note/details: i installed torque converter and tranny from 92 bonneville into the 95 lesabre, before install, cleaned tranny and converter well and installed new front pump seal, tranny filter and trans oil.

THANKS for any feedback and input on what path i should adventure down next. Im without a car and very short on cash so looking for cheap way to get 'er up and running.

Josh
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Old 01-09-2011, 08:03 AM   #2
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SGP358 would be the one to answer this. I'm sure he will get in here soon and answer this.
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Old 01-09-2011, 12:39 PM   #3
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Thanks. Also, how is the 3800 V6 engine series determined, im guessing i have a series 1?
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Old 01-09-2011, 12:46 PM   #4
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I believe 95 is a series1, but I might be mistaken. 96+ is series2, series3 is 05 I believe.
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Old 01-09-2011, 08:18 PM   #5
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Quote:
Originally Posted by Danthurs View Post
SGP358 would be the one to answer this. I'm sure he will get in here soon and answer this.
Dan, I'm not going to be much help on this one as I don't do any interchanging. We try to put the original trans back into the car or match letter codes.

The PO712 is a trans temp sensor. The PO755 is shift Sol 2 performance, which means that either the solenoid failed mechanically (not electrically) or there is an internal trans problem.

But this one is WAY over my head.

The only other thing that I can think of is to check and see if both transmissions are internally wired the same. I know that the shift and EPC sols are the same.

Was the Bonneville trans a known good working unit?

Is the connector wired properly?

If the car started before and had trouble starting after the swap, is the Range sensor OK?
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Old 01-09-2011, 11:44 PM   #6
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The Transmission from the bonneville was rebuilt by GM Goodwrench about 50k miles prior to me obtaining the trans (it was a friends wifes car and he is a motor-head and said that the trany/car ran great up until engine blew), I've been consulting with him about the situation and is over his head as well.
All connectors are identical and ive checked them for looseness and all seem tight and in tact.
As for starting issues... The LeSabre ran excellent before the transmission swap (besides tranny slip). I put the bonneville tranny in and it fired up just fine. Now the next day I attempted to drive and made it about 15 miles (not shifting gears) and turned it off at gas station to get gas and than started having starting issues. Now my battery is drained and chillin in the driveway.
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Old 01-10-2011, 08:53 AM   #7
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From what I've heard, GM did some internal rewiring that'* also different at the connector. See if you can get pinouts for both connectors and that'll probably let you repin/make an adapter.

FWIW, I have successfully put a 97 4T60 into a 93 LeSabre. The only things that had to be done was swapping the wiring harness. The 93 needed the 93 harness.
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Old 01-10-2011, 10:25 AM   #8
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Thanks I'll look into this.
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Old 01-10-2011, 01:04 PM   #9
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At this point, since it'* in the car... I'd aim to use the old transmissions internal harness and a chunk of another car'* external to make an adapter. That way you don't need to pull it out and swap them.
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Old 01-10-2011, 01:52 PM   #10
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Quote:
Originally Posted by BillBoost37 View Post
At this point, since it'* in the car... I'd aim to use the old transmissions internal harness and a chunk of another car'* external to make an adapter. That way you don't need to pull it out and swap them.
Sorry not following, I should grab connectors from an 92/93 transmission from another car and wire them to the connectors i have in the 95? If this is what you mean ill give it a whirl, thanks for the reply.
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