60' gone away (repost)

Reposting this because the other one disappeared. Friends 60' has slowed up and it's allover the place, and now so is his et. Usually 1.64 now it's 1.70il ish. No changes to the car and in some of the best weather we had year.
727 with turbo action rmvb w/o low band apply. Turbo cation 8" converter. Mph on the big end hasn't really changed much. Something on the trans? Converter messed up? Less then 100 passes on both
Maybe it's not the car......