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Hello. due to legal reasons I am only able to drive my cobalt so i built a 4.5 x 10 trailer so i can haul some building materials. I was surprised at how well it handles it.my only concern is it would be nice to retard the shift points a little bit so is it possible. Please does anyone know if or how?
 

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No not possible. Not unless you can find someone to tune the pcm and tcm. You will spend upwards of $500 to do that. At that point you should be doing performance mods. But in reality, no it’s not something that can be done. The Cobalt is a compact economy car not made to haul or tow heavy loads. Light trailers are pushing its limits.

Not only that but the 05-06 Cobalt with a 2.2 is deemed untuneable. Nobody is willing to fool around with the 16bit pcm anyways. Later models with the 32bit pcm were easier to tune. Not so much for automatic cars though.
 
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