I have a 06 Grand Prix and the trans will slip at 70mph and above should i try to change fluid or what??
Thanks Brian
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Is the fluid low or miscolored?
A fluid and filter change (don't flush) might be good for it, but I don't think it's going to solve your issue.
It sounds like you may have a problem with line pressure or the torque converter maybe?
how do you know its slipping?
Torque converter problems?
From the description it sounds like the converter isn't locking up.
I'd ensure everything igniton wise is good first. Check tps and maf.
All that will contribute to TCC lockup kicking in and out etc. High load, low rpm at 70 on our setup. Which means ignition is important.
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