in the rear, and change the trans for a T-56 wide ratio double overdrive. The top gear is 0.51, cutting rpms in half. Gearing is pretty close to our 5 spd for the first five gear sets. Tremec designates trans models as "TUET"s TUET 5044 (Cadillac 04-07 CSTV) 2.97 2.07 1.43 1.000 0.84 0.56 TUET11009 2.66 1.78 1.30 1.00 0.80 0.64 2.90 R TUET11012 2.97 2.10 1.46 1.00 0.74 0.50 2.90 (R) For comparison, Z32 5-speed: 1st - 3.214 2nd - 1.925 3rd - 1.302 4th - 1.000 5th - .752 Final: 3.69 TT or 4.08 NA With a 3.54 diff, at expressway speeds of say 65-80 mph; the engine rpm in my cars stays between 2100-2300 rpm depending on tire size. Basically loafing just under the torque curve. There was a guy here who was selling bellhousing adaptor kits, but as I recall the price was prohibitive. LOJ, the LS swap guru, was interested in developing an adaptor, but not sure if the project even got off the ground.
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