3 speed to 4 speed swap. Need help
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I own a 2000 cavalier 2.2 base model with a THM125C Transmisson florida car very good shape 60,000 miles I do alot of highway driving and want to swap to a 4 speed 4T40-E. I am buying a 2000 cavalier 2.2 with a 4 speed trans in it for parts but its a LS model, also has low miles. What do I have to do to be able to swap the trans and make everything to work properly. 3 speed is not electronic controlled like the 4 speed. but they both use the same ECM and BCM. Can anyone help
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