T45 problem - Please Help diagnose

I was accelerating up an onramp and grabbed for 2nd gear. Obviously, something broke at that moment. Here is what I know so far:

The car is completely stuck in 1st gear. I can move the shifter to any position freely at a stop. If I let the clutch out in 1st 2nd or neutral, I get 1st gear (always in 1st, even in neutral). If I try to move to 3, 4 5 or r, the car won't budge... probably because 1st and the other gear are both engaged and working against each other inside the transmission.

The clutch and cable still work fine. I pulled the shift boot off and the linkage attached to the exterior of the transmission is still in place.

So what is the likely problem? I am guessing either syncro/blocking ring or shift fork. The forks are suppose to be the upgraded hanlin forks and the car is acting differently than when I broke a fork before. With the broken fork, I could choose any gear except that of the broken fork.

I was trying to make a quick 1-2 shift when it happen. The car has 185k miles, so the syncros weren't exactly in good condition.

My plan is to buy a replacement, either stock rebuilt unit or a 'performance' transmission from D&D, hanlon, or someone else. I just want to confirm it is something very deep inside, like a fork or syncro before spending the money. If it is something near the surface or that is easily replaced, then I would rather do that of course.

Who rebuilt your transmission? A local company or sent it off?

midnightdriver said:

I got my T45 rebuilt with HD parts for $900 out the door. It shifts differently though then before it was rebuilt, much more positive gear changes. It has gotten easier to shift over time (reduced stiffness) as I put more miles on the car (about 3500 since rebuild).

I wanted to rebuild it so i could pick the parts going into it, but its up to you. Just make sure if you buy a reman, get a good one from a reputable company. Also good time to check the clutch & components and the flywheel.

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I talked to one guy who said it might be a lock in key, because that can prevent the trans from coming out of gear. Sounds likely to me since I had upgraded forks already.