I believe you are making your problem harder than necessary. Your 70 Standard transmission either has the 5/6 gear installed and is blocked out or if it does not have the 5/6 gear,it will accept a 5/6 gear. Find a late model 70 in salvage and get the 5/6 gear and install it in your tractor. In the 1940s Oliver had a Kit to add the 5/6 gear to early 70s, including the Hart Parr 70s. In addition to the gear, the kit included the parts to ad a master brake pedal. Does your 70 Standard have a master brake? It will be more difficult to find a salvaged Std 70. I believe an Industrial 70 master brake will also bolt onto your Std 70.
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