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Transmission swap?

Tiny
SETTERGRENH
  • MEMBER
  • 2001 PONTIAC GRAND PRIX
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 90,000 MILES
My engine went out in my 2002 car listed above, so I bought a motor from eBay out of a 2002 Monte Carlo with the same VIN code as my grand prix, had it installed it runs really good. Now I think my transmission is going out, I researched transmissions and didn't see a Monte Carlo transmission on the list. So, should I buy a Grand Prix or a Monte Carlo transmission?
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Wednesday, September 20th, 2023 AT 8:35 PM

10 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Hi,

Due to the control module which controls the transmission, I recommend getting a direct-fit transmission.

The transmission this vehicle came with is a 4T65E. There are two different codes (MN7 or N15) that will need to be identified on the transmission itself. Note that the Monte Carlo also has the 4T65E transmission, but the part numbers are different which usually indicates something is different.

I attached the OEM part numbers for both below. You can use that info to help find one.

Let me know if this helps or if you have other questions.

Take care,

Joe

See pic below.
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Thursday, September 21st, 2023 AT 7:57 PM
Tiny
SETTERGRENH
  • MEMBER
  • 74 POSTS
So, you're saying since it's a Monte Carlo motor I should get a Monte Carlo transmission!
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Thursday, September 21st, 2023 AT 11:10 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Hi,

The transmissions have different part numbers. However, both are electronically controlled. Since the original transmission has been working properly up to now, I would recommend getting the same thing and not one with a different part number such as the Monte Carlo.

The engine is basically the same. If there are differences with sensors or electronics, you could have changed them with the original ones. The transmission is a little different.

Let me know if you have questions.

Joe
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Friday, September 22nd, 2023 AT 1:07 PM
Tiny
SETTERGRENH
  • MEMBER
  • 74 POSTS
Okay, I have a 2000 Grand prix GTP as a parts car, will the transmission work in my 2000 Grand prix GT?
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Sunday, September 24th, 2023 AT 11:02 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Hi,

I need to know the 8th digit of both vehicles' VIN numbers. That way I can look both up. I believe the GTP is the supercharged version. Is that correct?

Let me know.

Joe
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Monday, September 25th, 2023 AT 1:17 PM
Tiny
SETTERGRENH
  • MEMBER
  • 74 POSTS
Yes it's supercharged, thee 8th. Digit for the GT is K and the GTP is 1 and my car is a 2002 not a 2000 or a 2001.
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Tuesday, September 26th, 2023 AT 8:11 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Hi,

From what I'm seeing, it should work. Please keep in mind, there may be connector differences, but it appears to be the same model transmission.

Let me know.

Joe
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Tuesday, September 26th, 2023 AT 8:19 PM
Tiny
SETTERGRENH
  • MEMBER
  • 74 POSTS
Okay, thank you. Are you sure it will work, I'd hate to take the transmission out of the GTP and have it not work !
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Tuesday, September 26th, 2023 AT 9:04 PM
Tiny
SETTERGRENH
  • MEMBER
  • 74 POSTS
Since I'll be using a transmission out of a supercharged GTP can I take the supercharger off and put it on my Gt?
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Wednesday, September 27th, 2023 AT 6:02 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Hi,

Anything is possible, but it is going to take a lot more than just installing the part. Remember, the PCM is what controls the powertrain. The PCM isn't programmed or designed for a supercharger. Everything would need to be switched, including modules, vacuum harnesses, wiring harnesses, and so on.

Let me know.

Joe
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Wednesday, September 27th, 2023 AT 7:01 PM

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