Might just be the fan clutch
Replacing the fan clutch... was definitly bad and making the "roar", we'll seen if thats the cause of the power drop/acceleration!
Not sure ??? Just drove it again and is louder all the time.. when in drive, if I shift down to 2 it mimics the sound.... so it seems to not be shifting into its top gear?
No SES lights...yes it does have a TH400...havent heard this theory but could be...when it does this it feels like it looses a bit of power I would have thought if it was in a lower gear it would feel more responsive or "snappy" at the throttle.
My 87 454 TBI R20 Suburban with 57,000 miles, cruises along just fine at 70 mph then suddenly the engine gets louder/roars as if it downshifted. Still goes but lacks a bit if top end acceleration. And is loud.
Replaced throttle position sensor as well as egr. Even gave up and took it to a...
Just got into an 87 R20... Of course the ac doesn't work, blows but not cold. Is it worth making it work and is it even possible? At least for a reasonable cost?