After filling, as soon as wash cycle starts, a loud screeching sound begins. wash still seems to agitate normally but sounds like belt or something binding binding.

SOURCE: Screeching Noise From Fisher & Paykel GWL115 Washer While Filling

if its while filling may be water pressure try turning tap down (hot)

SOURCE: Thumping/knocking/rattles during wash agitation cycle

Mine is doing the same thing. I opened it up to see what was happening and it was the drive belt tension arm bumping around. Soon, the belt started slipping during the spin cycle. Now it won't spin and the belt starts to smolder from the friction of the drive motor. If you haven't checked your belt, that's a good place to start.

SOURCE: screeching noise in maytag topload washer

The following link explains the problem you are having with your Maytag:

http://www.fixya.com/support/r387833-maytag_washer_squeaking_problem

It is common for the brakes on Maytag top loaders to wear and make noise, as well, as the snubber. There is a helpful tip that you can try to quieten the noise if it is the snubber. DO NOT oil it, or lubricate with any petroleum based products! This will ruin the unit and actually make the problem worse. NOTE: If the snubber is excessively worn, it was also cause vibration on the spin cycle.

If the brakes are worn, however, you can put a light film of oil on the brake pad. It is common for the pad to collect moisture in humid and damp climates and start to squeak against the brake stator. The brake pad consists of a rotor with a leather edge (pad). The leather can absorb moisture and begin to squeak against the brake stator. Oiling it slightly will get rid of the noise.

Confused? If you have questions, please let me know. I hope you find this information useful.

NOTE: There is a follow-up comment at the bottom of the link I provided from another user. The method this person used to release the tension on the brake can save you from having to purchase the brake release tool.

SOURCE: Washer won't agitate or spin out.

Well it is ethier Belt, Cluch ,motor ,Or transmission. But it does sound like your transmission . The loud clunk is the brake in the gear case ( Trans.). It might have broken off.

SOURCE: Knocking noise during agitation cycle - GE WNSR2100T8WW

I believe you must have one of the bottom of the line cheapo washers, as I do--the one with the plastic, rather than steel wash tub and basket? These are pretty poor machines. They cut corners drastically in every part of the design. I've replaced the aluminum hub that supports the spin basket ( the hub is bare aluminum and corrodes within about 5 years use from the highly alkaline detergent, then it fractures under mechanical stress. Then the motor burned out. I was able to get a nearly new motor on ebay for $90 incl. shipping. (BTW, if you need appliance parts try GOOD Appliance on ebay for new and salvaged parts--they're excellent! 100% feedback rating) However, I now have the same problem--a fairly loud knocking noise during the agitation phases of the cycle. This is cause by a really crappy transmission design that does not wear well. My advice is just ignore it as long as it works and isn't leaking oil and the tub seal is still good. If it does finally go to pieces get one on ebay--that is if you feel up to doing the job yourself since a repair person would charge more than it's worth to install it. I believe new ones can be had on ebay for about $80, some are sold with seal kits. Bottom line is--if you want a machine that will last you for 15-20 years--don't buy a cheapo model. The front loaders are better as they use far less hot water (energy and water savings) but a good one is going to be anywhere from about $800 to $1600.