The auto trans will handle alot more abuse than the T-45. I would definitely add a trans cooler as one of the first mods. I just had mine completely rebuilt and can tell you the weak areas. If you plan on racing it, definitely turn off the O/D. The Borg-Warner clutches used in the 4R70W are rated for over 400+ hp & 400+ lb-ft. I'm currently using Raybestos Blue plates which are rated for more than double that amount. It will definitely be able to handle the power from a blower. You might want to make some mild mods to it if you plan to spray it or use a turbo since they make more torque.
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99 Silver GT Auto
DTA Built Engine w/P&P heads, TDC Turbo (T-76), Built 4R70W, PI Multi-Disc 3200 T/C, Eaton 31 Spline Carrier, Strange 31 Spline Axles, Aeromotive 1000 HP fuel system, 66lb injectors, MSD DIS4, Accel DFI Gen VII & Mac 3" cat-back.
Built by Jade Performance
Best on Nitto D/Rs
11.698 @ 120.898 @ 12 psi (built block)
Best on Slicks
10.922 @ 122.95 (stock longblock)
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