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gear oil???

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ok, instead of using 80/90 like i know your supposed to in the tranny, i used what we had lying around..... 75/90 synthetic........ is this going to seriously screw my tranny? its a d/r in an 89 wagon.....

You could prolly throw half sand in there and that tranny would be okay :) Run it and find out. If it shifts poorly or just 'feels' bad to you, drain it and put in the right stuff.

75w-90 is spec for the D/R trannies in all conditions, so you are probably going to improve it

I've been running 75w90 synthetic for three years with tremendous success. It's still as clear as the day it went in.

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