[oletrucks] rear gears and swap

[mark <ccpanel@jps.net>]

try 73-81 GM 10 bolt corporate which comes in gears from 2:38 or lower to
3:90 or higher. posi/non... comes in 
camaro/TA/nova/skylark/caddy.... etc. holds my 4000# panel up just fine with
700R4 and huffed 305 with a lead foot. 3.42 gears and 255/60-15 tires...
nothin broken so far after 85,000 nasty miles!
mark

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