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Old 06-03-2011, 05:04 PM   #1
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Default 2001 Aurora, swapping to '04 Bonneville Engine/Transmission.

Hello Everyone,

I'm a newby & am in the planning/purchasing stages of swapping the engine with an '04 Bonneville 275 HP. The reasons are many, but the main one is that I have a trans leak that can only be fixed with engine/trans removal. So, since I want more power, & I have the m out already, a better engine seems like a good idea.

That being said, I know that the engine electronics are compatible, but I haven't been able to find definitive information as to Transmission compatibility. I already bought the '04 engine & would like to use the trans as well.

Does anyone know for sure whether the '04 Bonneville trans will work in my '01 Aurora?


Thanks,

Ed
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Old 06-03-2011, 05:48 PM   #2
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Billboost or SGP358 should be able to answer the transmission question. There may be a difference in mounts, but I can't say for sure.
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Old 06-03-2011, 06:16 PM   #3
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What tranny is on your shortstar now? If it'* a 4T6xx there is considerable reworking, but possible. I also don't think the sensor'*/wiring are going to be a direct swap type of thing either. having the PCM from the donor car would make things alot easier.
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Old 06-03-2011, 06:18 PM   #4
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The PCM may not line up with the pin out of the wiring harness.
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Old 06-04-2011, 11:43 AM   #5
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The PCM from the donor car isn't available. Anyone have a part # for the '04 Bonneville PCM?
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Old 06-04-2011, 11:45 AM   #6
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The Aurora Tranny is a 4T80
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Old 06-04-2011, 01:10 PM   #7
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The LD8 (4.6L) your getting comes with the 4T80 so it should be direct replacement. The PCM/ECM is
ACDELCO Part # 12587465
MODULE,Powertrain Control w/TIER 2 PHASE-OUT FED EMIS(NT9) or LEV II PLUS CAL EMIS(NU4)
$509.79

Thats probably the cheapest new price you'll find @ www.rockauto.com
https://www.rockauto.com/catalog/raf...8Y%2529%2BDOHC

A good place to get used GM FWD parts is Ed Morad. Here'* the parts request webpage with his phone number.

http://www.moradpartscompany.com/partrequest.html
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Old 06-04-2011, 03:18 PM   #8
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Thanks everyone, you guys made my day!!! When it'* done I'll let you know how it turned.

Good source for parts: Parts.com. $451.98 for the PCM
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Old 06-06-2011, 09:14 AM   #9
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Ok, I'm confused. It sounds like you are swapping the Bonneville engine/trans into the Aurora, but the HP and John'* post make me think it'* the other way around.

One concern going between the two transmissions is that the shift soleniods are reverse polarity IIRC, but that'* been solved for in the past. So that'* easy enough.
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Old 06-06-2011, 09:26 AM   #10
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Check Ebay for a PCM, should get a better price. Local salvage yards may have a PCM as well. You will need the PCM programed to match your VIN, this shouldn't be a problem if you get it from Ebay, most will program the PCM.
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