Question about 1998 GMC Sierra

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1988 GMC Sierra shifts strange when cold normal when warm

When driving my 1988 GMC Sierra is doesn't shift well and sometimes is very sluggish until it is warmed up. I would like to try something simpe like add transmission fluid. But I'm not sure if I should add its running or when its cold.

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You always add transmission fluid while the car is at running temps because transmission fluid expands when it's hot.

Posted on Jul 15, 2009

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I see if it need any add when the truck is warm and see were at on the dipstick i guess and then add

Posted on Jul 22, 2009

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