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Specs - 07 Tundra, 5,7L V8 regular cab regular bed, 4x4, 4,88 gears, 40x13,50R17 tyres (two on front newer, two on back about to go), 12" Bulletproof lift, 3" body lift, Icon coilovers add 2"

Lifted March 2013, coil-overs added around May.

Soon after the coil-overs were added, I started hearing a grinding sound on deceleration or going downhill. I was told that this was the ABS going off, and to keep an eye on the brakes.

This month, I found out otherwise. I took the truck to an automotive electrician to find out if there was a work-around so I didn't have to hear the noise. It turns out the noise was being caused by the drive shaft, likely a bearing or something of that nature. He said the pinion angle was likely the cause as the truck is lifted.

I went back to the specialist mechanic who works with lifted trucks and he is saying that the entire drive shaft has to be replaced. He says that the pinion angle is not an issue, and that there is a TSB out on certain 07 drive shafts, mine included.

Obviously, I will have to replace the drive shaft and whatever electronic nonsense is associated with it, but what should I do from here:

A) Keep truck as is
buy two new 40" tyres

B) Lower truck 2" by setting coil-overs to 0" instaed of 2"
buy two 40" tyres

C) Lower truck by 5" by getting rid of body lift and setting coil-overs to 0"
buy four new 37" or 38" tyres

D) Lower truck by 12" by getting rid of the 12" lift
buy four new 35" tyres and whatever else needed to get it back to near-stock, and sell it

Thanks for the input
 

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Taking out the body lift does nothing for the pinion angle because it is just a bunch of spacers between the body and the frame. I doubt that it is the whole driveshaft but much more likely the u joints needing replaced.
 
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