Thread: New Member - 1988 IROC

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If you want to simply lower cruising or highway rpm's perhaps changing the rear axle ratio would be easier.?
Maybe something in the 3.7 to 3.9 ratio would be better suited? Just a thought.

Originally Posted by 34_40

If you want to simply lower cruising or highway rpm's perhaps changing the rear axle ratio would be easier.?
Maybe something in the 3.7 to 3.9 ratio would be better suited? Just a thought.

I hear ya, I just want to keep the strip performance of the 4.1 gears. I figure with the OD transmission I could get the best of both worlds. It is mostly a track car but I do like to drive it a little around town and to the strip. The 3.73 gears wouldn't really drop the RPM that much but they would hurt my track times.

I do plan to eventually do a major change to the car and stuff a 572 in there with EFI, with a little less radical hydraulic cam and I kinda want the TCI 6x transmission with trans brake. Winter time project. The 572 may have enough HP to push it down the track with some higher gears, according to my numbers it would like something around the 3.73 range due to the extra HP, vehicle weight and finish line RPM of 6k. As it stands with the current motor the 4.1 gears get me across the finish line at just over 6k RPM.