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Originally Posted by neigh421
91 s-10 blazer rwd auto transmission makes a whining noise when changing gears.when i drive it real easy it doesnt make the sound but if i get on it a little it does.it does it in every gear and only when i reach around 2400 rpm.once it changes gears its quiet again. any advice would help. thanks in advance.
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Replace the fluids and filter on the transmission.
This is done from underneath the truck by removing the transmission pan. Check the colour of the fluid ... if it is pink (or light purple) then tha transmission should be OK, if it is brown or black, then the transmission is on its way to breaking (possible worn out clutches). If it is black then you will need to have it re-built or replaced (it is probably cheaper to replace it with a transmission from a junkyard).