Its an '89 700R4 with 60K miles?? Thrans in good working order with new fluid and filter.

 

nobody????????

 

I would say that it is that way to keep it from breaking. At higher RPM's, you produce more power, and therefore ran a higher chance of breaking things when it shifts solidly.

Another reason is that there is more power, and that will cause it to be more difficult to stop components from spinning (when clutches and bands apply), sort of like when you mash the brake pedal at 80 MPH versus 25 MPH.



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Working on:
'84 Z28 LG4 305 with 200,000 original miles!
Added dual elec fans.
145 MPH IROC Speedo
Building 430 HP 350 (ZZ430)
using primarily GMPP parts.
Short block sitting on a stand. (Man, those Fast-Burn heads sitting on it look good!)

Starting to look like the Kicker poster child!

ASE Certified Master Tech

 

Improper calibration and/or the band is buned.

 

I had the same prob, nice firm part throttle shifts and 1-2 flare at wot. The band was severly burned/pitted and wore right into the rivets holding the friction paper on.