I recently changed the tranny filter in my '90 LS, and used the Type T. I had put in dextron III before, and had some funny-feeling shudders, poor shifting. Toyota parts guy said Type IV is for newer transmissions, and the T was what I should use. Owners manual said type II.
Anyway, the shudder is gone, and shifts feel great!
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Tranny filter ? I am under the impression that there is a screen...............