I should mention that around 81-82 they eliminated the removable tunnel, but still carried on with a high and low hump profile. I have trucks with all three types.
I'll see if I can get a pic of that '78 tunnel posted tonight.
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'66 C10 longstep - Clifford equiped
'84 C20 Suburban 6.2L - awaiting 4x4 conversion
'91 V3500 Crewcab - awaiting diesel swap
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