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Hello, so i need a new tranny for my b308 V6.

It came with a 4 gear automatic which ended its life.

I was offered a 5 gear automatic gearbox out of a b235r. Is it possible to install it in my car?

I know a b235e gearbox sits like a glove on a b308, but i dont know about the 235r.

Any help is appreciated!
 

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Unless my searching has been inadequate, no one has figured out how to replace a 4-speed auto with a 5-speed auto on a 9-5. Something to do with wiring harness being different and the software not knowing how to handle the extra gear.

Most likely that 5-speed auto will bolt right on (later b308e used it). But your transmission computer won't know how to talk to it.

I'd love to hear if someone has done this swap successfully and gotten all the gears working.
 

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Nope. 5 speed gearbox will not work. TCM is totally different and you can not swap them.
You need 4 speed gearbox.
 
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