Is the screech when you let the clutch out (what you wrote) or when you try to do the downshift (seems more likely)? And does it occur on both downshifts or is it just the 5-4? And does it not happen on a regular 5-4 only downshift? If it happens pretty much all the time, and with multiple transmissions, it's more likely a problem with the clutch not releasing completely. Either the hydraulics are leaking, or you just aren't depressing the pedal enough (I've done it myself).
I'd also vote for what Steve said, and recommend a straight 5-3 downshift where needed. It's all I ever use and I end up with a 5-5 about once a year.
Tom Lyttle
Decatur, GA
IT7 Mazda - 2006, 2008 SARRC Champion
ITS Nissan 200SX - finally running correctly
FP Ford Capri - waiting for a comp adjustment
GT3 Dodge Daytona - what was I thinking?
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