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Which Redline GL-4?

Redline lists 2 GL-4 trans fluids. Does anyone have any input or
recommendations on which I shloud use for my 87 5kcsTQ? At 190k miles, the
synchros ain't whaty they used to be. Very hard to shift when cold. Although
the manual states GL 4, my mechanic recently talked me into synth. Agip GL-5.
Don't know what was in it previously, but the Agip offered no improvement.
I'd like to try the Redline GL-4.

I'd appreciate any comments/recommends on which GL-4 and any "additives" that
anyone has found useful in high milage transmissions.

Mike Aiello