Hard downshift from 2nd gear to first. A-833 4-speed.

So I parked my 68 Barracuda last fall but before I did, I was experiencing difficulty getting the transmission to shift back to first gear from 2nd gear.

New Brewer Transmission purchased as part of their 4-speed conversion kit.

Mcleod dual diaphragm clutch , over center spring removed.

I initially had synthetic fluid in it but removed it and replaced with regular gear oil. 75/90 oil in both cases.

No difference.

Transmission has 7000 miles on it since install.

What adjustments would correct this or are there any?

I've read about mixing synthetics and regular petroleum products but that doesn't explain why the trans worked perfectly before with synthetic oil.

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