I have experience repairing these Hydro Gear's, so here's my 2.5 cents....
A. Changing the oil and filter will do you little to no improvement, and if any, it will be temporary.
B. Changing the filter will require complete removal and disassembly of the transmission.
C. If you are determined to go that far, the cause of your problem is worn parts,
specifically those named "center section" and "block assemblies", so those need to be replaced along with the filter.
D. Purchasing parts will take you north of 200 dollars.
(i.e. block assemblies, center section, filter, seal kit, oil)
Hope that helps.
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