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Contact Vengeance Racing in Georgia. They have done (3) high HP M6 to TH400 swaps in the past year. All three are now high 9, low 9, and one 8 sec ZL1 I believe.
I personally would never do it. You now have a dedicated drag car IMO with a TH400. You can play with transmission and rear end gear ratios for the 1/2 mile. Then swap them out again for the 1/4 mile. Low cost and high strength swap option is TH400 hands down.
VR can probably do what ever you desire and make it work with 4l80E. I’m sure the price difference is significant vs TH400.
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15' Ashen Gray Metallic Z/28
14' Crystal Red Tintcoat ZL1 6M, 9.62 at 150.75 MPH
12' Opulent Blue Metallic CTS-V Sedan, 10.690 at 129.60 MPH - SOLD
06' LeMans Blue Metallic Z06, 11.726 at 127.80 MPH Motor - SOLD.
96' Impala SS LTx, 11.397 at 118.10 MPH Motor, 1st stage 10.526 at 127.46 MPH
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