Gear Ratios yet to be confirmed
Hi Bob
As the NOS and one of the others have the same open drive shaft rear out put housing I suspect that they will be the same gear ratio as the CMP because the open rear drive shaft was used on the bigger trucks and the closed torque tube drive shaft on the smaller trucks. I'm trying to find which gear ratios actually were different as offered by GM at the time. Know that 3rd is one of the gears the was different because most parts sources are specific about the number of teeth my CMP is 33 teeth on third gear, well more exactly it is 32 and 1/4 teeth.
One tip I have heard for telling the different lower clusters apart is that the big truck lower cluster has two groves machined in to the shaft see photo. I have not found how to determine which gears goes with what on the upper cluster.
One bit of information about both Jim Carter Parts and Obsolete Chevy they both will ship world wide I asked and they confirmed.
As to being in New Hampshire and not stopping by we would loved to see you and Joyce. But it would have added at least another 3 hours to your driving time plus however long we would have spent catching up. Just catching up could take a couple of days. Maybe next time we could plan a stop over. I'll take a picture of the view from the quest room and send it. Tell Joyce we have owls.
Cheers Phil
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