Legacy wagon , shaking when hot

hi im presuming your old car is non turbo if so you will have to change a lot of parts over to make it work, you will have to replace entire engine loom, the ecu will need changed over then the fuel pump and all of the fuel lines will need to be replaced with the bigger turbo model ones to keep up also the trans will bolt strait up but will be the major weak point so swap over if possible.

Hi turbo or non turbo models?

hi the temp gauge should sit in the lower quarter of the gauge, it has to be a faulty water temp sensor as anything else would cause it to over heat badly

A bad CV shaft can cause the vibration while accelerating and a warped brake rotor can cause shaking or vibration while braking.

It is safe. the manufacturer would tell you to do it if it wasn't (unless it was toyota). any way it is better to run in two wheel than four. will save you money. it's less wear and tear on the system.

Hi,
The 1st>>2nd shift on the Subaru 4EAT automatic transmission can be more abrupt, but 3500 is too high.
Is there any delay when shifting from Park to Drive?
Does the Power light flash on startup? If it does, you can pull the codes by following these instructions.

This trans has 'bands' that can be adjusted. I'm not 100% sure they affect the 1st>2nd gear shift, but maybe they need adjusted.

Take a look @ ultimatesubaru.org/forum and http://bbs.legacycentral.org. 2 sites dedicated to Subarus.

Good luck,
Td

Hi,
WOW... It'd take a book's worth of instructions on here to answer your question. Which is why I would recommend that you purchase a repair manual specific to your model. It should give you all the info you need for these jobs and for future jobs as well. I always buy one for each vehicle that I plan to keep a while... they aren't that expensive and really pay for themselves in the long haul.
Hope this helps... Good luck with your project!

buy an engine set up for turbo as theres so many internal differences

pay close attention to the fuel filter as this is a common symptom and sign of blockage and poor fuel delivery....replace fuel filter

replace the wastegate vacum lines or wastegate acuator. if they leak it raises the boost. Let me know if its not that.