Steve66 Posted October 26, 2021 Share Posted October 26, 2021 Working my way through HPDE with the goal of getting into SM. At the track this weekend someone mentioned that I would need to remove the 6-speed transmission in my car and replace it with a 5-speed. Is this right???? Reading through the rules it doesn’t appear to say that but I’m only just starting so maybe there’s something I’m missing? 14. Transmission / Clutch & Flywheel / Differential 14.1 Transmission Transmission must be unmodified other than updating or backdating replacement parts. Gear ratios must remain stock for the year of car. Shifters may also be updated or backdated but must remain OE (90-05). Shifter bushing may be replaced with alternative materials not to differ in function of OEM plastic shifter bushing. However, Appendix A only shows 5 gear ratios for each car. Do I need to change my transmission or is Section 14 right and the Appendix is wrong? Quote Link to comment Share on other sites More sharing options...
Rick Worth Posted November 12, 2021 Share Posted November 12, 2021 I'm sure you've figured it out by now but it is 5-speed with 4.3 diff. Quote Link to comment Share on other sites More sharing options...
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