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SO i have decided to sell my truck and get an 8.1l big block. but as I was doing research on performance upgrades for the future I realized only the Duramax guys know anything about the Allison..this one guy on a gto forum I think installed a whipple supercharger okay cool this is an increase in more than 90 hp on a stock Allison so he limped it. he calls whipple and they tell him its a problem with his headers BS so he replaces them. same problem... calls whipple back they tell him its his catalytic converter replaces them..same problem calls whipple back they cant figure it out ( BS ) so he says he will just pull the codes and drive it everyday what can happen.. no he needs a new tranny and wants whipple to pay for it...all he had to do was search LIMP MODE and could have saved quite a bit of money.
Just thought I'd share that with you
Just thought I'd share that with you