Sounds reasonable......I know the 4L60s do have line pressure issues - which is ONE of the reasons they are a weak unit. I have burned through many 4l60E's and 700's but I dont think it was from downshifting - just regular old upshifting with lots of power. Actually, I built a 700R4 a few years back with a full manual valve body and it still lives (upshifting and downshifting) to this day. Of course, the governor was modified wide open and we added a bunch of other mods to the internals to make it a bit beafier and boost line pressure, but nothing crazy.
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96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
11.6 @ 123mph (1.6 60' - getting there
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