The factory front apply arm-ratio runs from the high 2s to to the high 3s. I did once see a 4.2 (I think it was), which I snapped up and stuck into my 904 winter package back in yr2000.
But you can get a 5.xx from the aftermarket, like A&A Transmission, This arm will multiply the apply force coming from the front servo, and if your problem is slippage due to insufficient clamping, this will solve it.The tranny has to come down tho to install it, and the pan off, and probably the VB too,IIRC.
