Hmm...no shift relay?? Th400 Downshift Switch

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HotRodPC

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HotRod
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85 K20 LWB
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454 - Turbo 400 - 3.73
Yes, I believe this is the case.

Also, I noticed something at work today. On the wall, I have a Snap-on tranny ID chart, showing the shapes of the pans. According to the chart, the th400 was used through '93.

Yes, I was aware it was used later than what most people think. I am thinking it was used in things like the P Vans or Step Vans but fairly certain it was done in Pickups, Burbs and Blazers by 90.
 

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