looking for poor boy way to stop slippage in past on gm trans i would boost line presure with spring and or shims at pump what works on these allision ?
NOT happening. You've already hurt it so your only choice is to rebuild it.
With 20 years of data on what causes a trans limp in a Dmax truck, you'd think people would be smarter about this and know beforehand what not to do.....but no.