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· Banned
2006 STS V8, 1999 Seville STS
597 Posts
Discussion Starter · #1 ·
Hello All,

I have a 2006 STS 1SE package which comes with the 2.73 gears. I had previously drove a 1SG package with the 3.42 (or 3.23?)

Regardless, the torque felt MUCH different. This is the thing I miss most about not getting the 1SG package. I'd like to swap the gears from a 1SG (I work at a high performance salvage yard,) and put them in my 1SE. We have a tech2 in our service shop as well.

Ive seen the thread titled "4T80E 3.11 to 3.71 swap." I doubt this has any relation to the newer trans' in the 2005+ STS, so I was wondering if anyone else had any information on this swap. I posted this in the STS thread, and no one had any info.

Thanks in advance!

· Registered
2005 STS V8
574 Posts
I'm assuming the 4T80E is the FWD transmission in the older north star? The new STS is RWD and has a separate differential not part of the transmission as it is in a FWD car.

I don't see why this would be any different than a gear ratio swap in any other vehicle? You'll probably have to recalibrate the speedo/odo but other than that it should just be a gear swap.
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