Not Ranked
If drive shaft it would do it all the time. U-joints and rear are fine. It's definitely trans. It's only done it in fourth gear at cruise speed (60-70mph) 2600-3000rpm range.
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FFR MarkIII,FE,toploader,IRS,3.27,Vintage pin's SOLD!
68 F100 Custom Cab 418 cube FE/auto
99 SuperDuty Tuner/chipped/4" Banks TOTALED!!
02 Super Duty 7.3L
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