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Mike, This past season I replaced the 468 BBC engine with a 565 engine. We took out the 4.88 gear set and installed a 4.56 coupled with the 1.76 glide. I now have a compound 8.02 low gear. We also replaced the 8-inch (6000 rpm) converter with a 9-inch unit (5400 rpm). The issue is that the car feels like it has a huge anchor tied to the rear bumper. It went from a major wheel standing car to one that hits about as hard as my motor home. The thing runs well, 8.50s at 160+ (sea level) in a 2581-lb car, but it looks and feels like a 15-second street car, ah make that a 20-second street car. Where did we miss the boat? The lights went from .380's to .430's. Is it time for a 1.89 gear set? Rprogas That is a great question. It pertains to the age-old search for that elusive combination torque converter stall, trans gear and rear end gear. First, you need to know the peak torque rpm of the new motor and how broad the torque band is to set the stall. The max T.C. flash should be in that area. Second, the gear ratio should be enough to run the engine through the finish line lights at or just above peak horsepower. Third, you need enough low gear to launch the car for good reaction and 60-ft times. Usually, if needed we will use a 1.96 first gear ratio. That is enough to make a noticeable difference. The starting line ratio would equal 8.94 with the lower gear set which is a pretty serious jump from 8.02 without changing finish line rpm. Things to note: You need a good gear set 1.76 style carrier with all billet gears. Some sets are half OEM and half aftermarket. That's not good. You need to use high quality fluid for the long life of those gears. Many of our customers in .990 and .890 racing use 1.96 sets along with our 4340 shaft planet carrier and our bolt in pins with great success. This set-up can wake up your combo or take that motor home soft hit and put it back into race trim. Thanks for you inquiry. Mike
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