I think that was true for older 70's-80's tranny's. ( not 100% sure )
If it was me i would drain, replace filter and buy and new pan with drain plug.
https://www.dormanproducts.com/gsearch.aspx?year=2007&make=GMC&model=Yukon&origin=YMM&parttype=Transmission%2520Pan
After you drain install new...
I just priced the one i like. $68,000
Doesn't come in siren red.:argue:
So if i want red, I have to get the denali which is about $2000 more. :flipthebird:
But the GMC grill is ugly.
I would rather spend $ 200 on new fluid,filter, and new pan with drain plug, rather than do nothing, And wait till it blows up on you. now your out a few $ thousand.
Yesterday i did a power steering flush. pulled the hose off the reservoir and let it drain.Got both wheels off the ground so i could turn them and get as much fluid out as possible.
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