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Hey new to the forum. My 2003 lb7 was bone stock up Untill a month ago I installed a 5 inch straight pipe and flashed ppei custom tunes. I had the tunes for not even 24 hours and had it on time 4 + 100 hp and at wide open throttle 85mph it shifted very hard and went into limp mode threw code p0735. I got it out of limp mode and put it back to tune 1. What’s my next step build the trans? I heard it it could of happend because it wasn’t getting fuel due to the harsh tune. Did I damage the transmission?
 

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it could be your transfer case(if you have 4WD) or a transmission issue. Quite common to get limp mode on the 5 speed Allison after tunes are installed and usually means that the transmission needs rebuilt/upgraded. Issues with the transfer case(4WD trucks only) can also cause this code to set so check your case fluid to see how much metal there is in it.
 
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