Just a quick note.
The 78 Z28 came from the factory with 3.42 gears for the TH350 trans
And 3.73 gears for the 4 speed manual.
I owned one with the th350 and it tach 3000rpm at 70mph with 255/60/15 BFG radials
Apparently GM thought 3 grand was fine for long trips with a stock motor.
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