difference between a 4t65e trans and a 4t45e trans? - Pontiac G6 Forum
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post #1 of 37 (permalink) Old 06-23-2014, 11:20 AM Thread Starter
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Question difference between a 4t65e trans and a 4t45e trans?

Does anyone know the difference? My g6 has a 4t65e trans and it needs replaced I found a good deal on a 4t45e with low miles. Can they be swapped? Is the gear ratio the same? Are the axle splines the same? I'm not much of a transmission guy and can't find any info on this the only thing I know is they look pretty much identical from the time I had to look at it the only difference I could find was the numbers on the I.d tag on them. Any information would be appreciated.
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post #2 of 37 (permalink) Old 06-23-2014, 11:30 AM
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Trans go by torque ratings, the 65 is higher, so no go.

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post #3 of 37 (permalink) Old 06-23-2014, 01:14 PM Thread Starter
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But don't the newer g6 cars with the 2.4 ecotec use the 4t45e?
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post #4 of 37 (permalink) Old 06-23-2014, 02:08 PM
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My 2.4 has the 4t45e
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post #5 of 37 (permalink) Old 06-23-2014, 04:14 PM
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IIRC the bellhousing between the two is identical, the internals are different though, one handles more torque. However, if you switch transmissions you are likely going to have to get your TCM/PCM re-programmed for the new transmission. I didn't even know the G6 came with the 4t65, did you check your RPO codes to make sure which tranny you have?

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post #6 of 37 (permalink) Old 06-23-2014, 08:03 PM Thread Starter
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Yes I gave the dealership my vin and that's what they told me
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post #7 of 37 (permalink) Old 06-24-2014, 01:41 PM
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Quote:
Originally Posted by natep. View Post
Yes I gave the dealership my vin and that's what they told me
Which engine do you have?

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post #8 of 37 (permalink) Old 06-24-2014, 10:21 PM Thread Starter
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2.4l
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post #9 of 37 (permalink) Old 06-25-2014, 01:40 PM
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Are you sure, don't why they would put a high torque trans in that small engine.
The 4T45E is mated with all 2.4 engines.
I think the dealer gave you wrong information.

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post #10 of 37 (permalink) Old 06-25-2014, 01:47 PM
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OP post a picture of your RPO code sticker from the glovebox, not saying you don't have a 4t65, but the RPO codes will tell you for certain...

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post #11 of 37 (permalink) Old 06-25-2014, 05:48 PM
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Some 2.4s did come we the 6 speed to try and increase mpg.
As mentioned the RPO code is your best bet
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post #12 of 37 (permalink) Old 06-25-2014, 10:51 PM Thread Starter
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I'll upload a picture of the i.d. tag on the side of the trans if I can figure out how
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post #13 of 37 (permalink) Old 06-26-2014, 01:03 AM
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Transmission looks to be a 4t45 not a 4t65, the broadcast code is 6EWJ which is the 4t45 IIRC. FWIW transmission was built on Oct 26, 2005 lol... But post the RPO sticker from the glovebox and we can double check the transmission...

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post #14 of 37 (permalink) Old 06-26-2014, 08:32 AM Thread Starter
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Here is the rpo sticker
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post #15 of 37 (permalink) Old 06-26-2014, 08:35 AM Thread Starter
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And this is the I.d. tag on the trans I had lined up to buy but was told it was a different trans
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