Re: pinion angle question
Yes that is the question I was asking. I haven't read Jolly's write up about 250's in the 1965 but I have seen several ads showing 250's were new in GMC for 1966.
My frame part number is 1965 according to other threads. My 250 is casted as Sept 1965 which is correct for a Sept built 1966. To make a long story short, I'm ruling out vibration issue which could be related to pinion angle, engine aligment, motor mounts, drive shaft components, etc. So, if 250 was used in 65 and 66 there shouldn't be any engine alignment concerns.
Update: yoke, ujoints, and drive shaft balancing in progress. I will update with news on vibration.
Thanks for response. Like I said, this is the first time Ive heard anyone say that 250 were used in '65 gmc's.
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