Will 99 silhouette transmission work in 01 Monte Carlo ss

[topswapped]

I have a 2001 Monte carlo ss with a top swap and the transmission needs replaced, it is stock, and I have a good transmission from a 99 oldsmobile silhouette with maybe 60k miles on it that I could put in there for basically free but I was wondering if it would work. Mine of course has the stock gearing and I found this chart that shows the silhouette has 3.29 gearing. Also it says that my transmission has ims and the olds doesn't. I dont even know what ims means?

[RobertISaar]

IMS = internal mode switch, which..... I THINK means does away with the external range selector module that sits on top of the manual shaft. could be wrong.

[topswapped]

Well that explains what that little module looking box thing was then it should all fit up fine as long as I get the PCM reflashed for the 3.29 gearing

[Bake82]

You might have to do some re-wiring of the transmission plug. You should get the wiring pinouts for the large round plug along with the connectors that go to the park/neutral safety switch.

[l67ss]

an 01 monte ss has 3.29s stock so no need for a reflash there. and yes ur car has an internal nss....the olds has external so wiring will be involved