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Thanks for the responses guys I appreciate it. Bionic - I'll get in touch with Profile Auto Sports and go from there. Do you know if these guys are legit? I couldn't find a website but I found their FB page which isn't very popular. I'd really like to get an idea of pricing. My 6AT isn't slipping at the moment but I'm planning to add a lot more power very so I'll need a permanent solution to this problem. Vevapower - glad to hear the upgraded AT is still civilised and easy to live with as I'd rather not make any compromises in this area. I'm really impressed with the power you guys are extracting from your engines and running it through the ZF box. Great stuff!

Thanks for the reply mate. I would be willing to drive my car down to Sydney if there was no other local option available for a reasonable price. However, Brisbane/Gold Coast is my first preference so I can take my car back in the event that I have any issues later down the track. Hopefully a few other local guys can chime in with their experiences too. Does upgrading the transmission affect the drivability of the car in any way? Are you happy with your CMS Stage 2? Can I ask what cost and how long did it take? On a side note, I'm very impressed with the power you guys are getting from your engines and the high trap speeds reflect that. I joined this forum to find out a solution to our transmission problems and keep getting distracted with other threads. Some great builds in here.

New here.. Can anyone recommend any workshops in Brisbane/Gold Coast area that can rebuild transmissions? I own a BMW 135i which coincidentally has the same 6AT transmission that is used in some of the Falcon's. It is the ZF 6HP21. From what I understand the trans is only rated to 600nm. I want to be able to run between 300-360rwkw and upwards of 600nm daily without any issues. Also, can anyone give me some estimates of how much this would cost and how long my car will be in the shop? The slipping trans is a very common problem on our modded platform, particularly in the USA. Thanks in advance.