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1991 Mercury Cougar LS 5.0 in restoration
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Stock 5.0? Or modified? If modified, how much? Hard to answer a trans question without knowing what it has to deal with for power ?
 

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1991 Mercury Cougar LS 5.0 in restoration
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971 Posts
Honestly if it's just weak, I'd probably go with a basic rebuild kit form Summit Racing. You could add a shift kit to this is you want a little firmer shift. The other item, to check is the valve body if you're having shifting issues that isn't your normal "slipping". Otherwise get a fairly standard torque converter with this kit and go. Link below is to a rebuild without shift kit, valve body or converter - $180.

https://www.summitracing.com/parts/sum-705011/overview/
 
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