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1/2-ton is a TH700, technically 4L60 (no 'E' until '93).
For '91 the 4L80E replaced the TH400 in 3/4-tons.
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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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