How do I take out the themalstat with out breaking the seal

you may have to break the adhesive seal around the flange . Rem,ember that you will also have to pull the drive shaft (axles) to the diff. To break the adhesive seal you may use a jack and lift a bit under the pinion flange while using something like a chisel to help break the seal

Likely a broken rear retention seal or a leaky break cylinder or caliper if so equieped.

You have a bad seal in your break booster unit,, just behind your master break cylinder is a big roung doughnut looking thing, this unit works off vacume from the engine, it helps you push down on the break peddle so its not so tuff to stop! well on that booster unit there is a seal that keeps the unit from loosing vacume past the rod leading into your break peddle, sounds like this seal is leaking vacume .. you can replace this unit your self if you want to tackle it, its going to be some work to replace and you should probley have the manual on this truck to do the work.
Hope this helps! Good Luck!

Possible when the HUB was changed that the sensor connection was damaged or was not taken care off . So please recheck with your work and the fault will be seen.

IS the clutch plate in backwards ?????????????????????????????????????

As long as you have all the bolts removed that hold the pan to the bottom of the block. Just make sure you drained all the oil and when you have all the bolts off, lightly tap the oil pan with a rubber mallet to break the seal that makes it stick to the block. If you need to use it, use a puddy knife to break the seal if the mallet isn't working. Just remember to scrap away pieces of the seal that stayed on the block or oil pan before putting the new seal on. It will save you heartache in the long run. Hope this helps.

if hermatite was used to help seal the pump it will need a helping hand(hammer)to break the seal.or a more gentle screwdriver in the flange gap to break it.

Are you sure the filter is actually breaking? It sounds to me like the wrong oil filter for your engine, and it is pushing the seal on the filter away or loosening up because it is not a proper fit for your engine, or maybe there is still an old seal from the old filter still stuck up on the oil filter adapter and the new one is trying to seal on that.

use 5w30 or synthetic oil. also more antifreeze and less water. NO more that 60/40

Sienna is like Previa... If the rubber seal around the Rt or Left read window is hardened, closing it will feel like this and 'may' break.
Use ArmorAll and hit it a couple 3-4x to soften the rubber seal all the way around (both sides too, front and back) and make the seals supple and pliable again. Should close OK now ;-)