Maytag top load has very loud noise when it goes to spin cycle. the whole tub bangs into the side and back cabinate of the washer

Replace all four struts

If it's a roaring noise, the tub bearing is probably wearing out. Spin the tub a little with your hand, if you hear a little of the roar, that's it.

The spin cycle is used to rid the water by centrifugal force. As the tub spins, the water iis forced out of the clothes. The banging noise comes from the weight of clothes being on one side making the load unbalanced. The machine will absorb some minor unbalancing. If it gets real loud & the machine starts dancing, shut the machine off by raising the lid, when tub stops, rearrange clothes.
Louie Almond

either unit is unlevel or one of the tub supports has come disconnected .... these washers have a slanted top lid so you must put level at side of washer on front and both sides and check front to back with level at side cabine seam as your leveling point

YOU MEAN LOUD DURING SPIN CYCLE? IF THAT SO, WHAT KIND OF NOISE? BANGING NOISE MEANS YOU HAVE UNBALANCED LOAD OR ONE OF THE SUSPENSION IS BAD OR FELL OFF. GRINDING NOISE MEANS YOU HAVE A BAD TUB BEARING, TO REPLACE THAT, YOU HAVE TO REPLACE THE WHOLE REAR TUB ASSEMBLY, VERY COSTLY. MEANS YOU PROBABLY BE BUYING A NEW WASHER.

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ok open the door
make sure the thing is empty
try to move the inner tub
if you can shke it side to side anything but around
you have a broken spinner support

check the counter balance weight

pull hoses off the pump and see if there is anything stuck in it

First plug off the wall. Open the machine from behind to examine if any shock-absorbers(known as dampers) or springs have come off or broken. Your dealer could help with spares. But you could do the job yourself.

For spares:
RepairClinic.com (which is good)
espares.co.uk
AppliancePartsPros.com

A loud banging sound in the pipes is usually caused by a water hammer effect. Water hammer sounds are caused by a valve closing in the system, and yet the water in the pipe is still flowing because of its kinetic energy. The banging happens as the water hits the valve that prevents it from going any further. If the kinetic energy is great enough, it can actually cause a pipe to burst or explode at the end. If a valve is closed near the beginning or in the middle of a system, the water keeps flowing after that point, and it can actually create a vacuum. This vacuum can cause a pipe to implode if the stress is too great. Roaring type noises may be coming from a spin bearing. This bearing probably had the grease washed from it because of a tub seal leak.
Squeaking sounds in a new washer are usually caused by the new parts getting broken in, and will usually go away after several washes.
The sounds of water gurgling, slurping, or sloshing during a spin cycle are usually caused by the drain pump pushing the water out of the washer tub.
Too much water pressure can cause a whistling or squealing sound. Adjust the hot and cold intake water valves to relieve this sound.
Metallic clinking sounds during spin or agitation may be the result of drive train components meshing during speed changes or after a pause.
Swishing or swooshing type of sounds may be caused by water and suds trapped between the tub and basket during a spin cycle, and will usually clear up as the water is drained from the washer