Transmission wont shift, took it to shop and they said shift soilnoids are shot. 400$ to fix sound right?

Take it back the the transmission shop, it needs to be further diagnosed and probably rebuilt.

no transmission.
get the shop manual and read?
the trans has clutch pack for engine then a drive belt.
it is CVT drive, (the pulley magic box)
id check cables first for shifting not too much slack.
the CVT can not go in reverse. so the reverse /forward is downstream from the CVT.
and not wheel bearings, it is this shift box, issue. or just a bad cable, to it etc. are you really owning this> (400 only seems wrong)
2008 Suzuki LT-Z400 . eiger 400, or

if the clutch fails and drags it will not want to shift easy
or the cable is bad, or not adusted, right it can not shift right
look for simple things first
like this, if it does not go forward make sure FIRST the cable even goes to forward mode. (at the end of the cable)

I gather you had it in the shop for a shift cable on your transmission, and now either the transmission will not shift into gear or it does but the car doesn't move? I'd be having the shop tow it back at it's own expense and fix it it right. A reputable shop will have a 30 day warranty on parts and labor.

Check the linkages between gear shift and Box could be loose. If these are OK get a transmission service by a good Auto Transmission shop

it sounds like transmission trouble take it to a shop cause i dont think you wil have the tools to fix the trans at home

Sounds right Aamco is a good shop and they know transmission. Your Explorer transmission is a AODE this a electronic controlled transmission. I would be up set that who ever replaced the transmission before may have damaged the wiring to the transmission. Did you get a war. with the first repair.

there are no instructions and pictures wont tell you anything. Experience is what gets the job done. You can see what needs to come out. Now its up to you how you want to tackle it.

Check you oil level sounds like its low, other wise your looking for new transmission.

I have the same problem with my other car I went to a repair shop but they'r asking
for $ 2500. What I did? I replaced the transmission for guaranted working one from surplus
parts seller now it works perfect. $500 for the transmission about $400 for installation. I save a lot...

Sounds like a problem i had on my 96. but, check the muffler.If the KAT converter is pluged , it wont shift into 3rd, at 45mph. Witch the OBD and 3 techs couldnt find.This unit only cost me $100.00.Better than 2 grand. Let me know.