I just took out a 10 bolt from my 67 and put in a 12 bolt from a 70.Bolted right in. But, like Aug98 suggested I needed a new u-joint. P.S. nows a great time to install all new bushings in the trailing arms
It will be a 100% bolt in swap. I just finished installing a 12bolt from a 69 350 Malibu into my wife's 70 Malibu conv. TOO EASY! The u-joints were the same, but as I understand, once in a while they are a different size. I had just put new brakes on the 10bolt and they swapped right over to the 12bolt. Also, 5 of the 6 bearings in the 12bolt had to be replaced.
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