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I wonder what the danger might be of adding a lockup switch to my car? I would probably only use it in third gear, and sometimes fourth to keep it from unlocking itself. But why isn't it enabled for third gear from the factory? Am I risking damage by forcing lockup in third?
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Not sure why it was not done from the factory, except like Christ was saying, maybe it is designed to not spend a lot of time in 3rd. All my vehicles lock the TCC in both 3rd and 4th.
The only drawback I can think of is if the ECM considers it an error, and dumps you back to warmup mode. My van does that if it senses anything out of factory spec, and you have to pull over and restart (since it won't restart in N). Then it would certainly not be worth it with the fuel wasted in warmup mode.