Can't Downshift from 5th to 4th.

Like it says...

I built a T5 today based on a 86 transmission. I used parts from 4 different T5's spanning 3 revisions. Used 3rd from one, OD from another, the best syncro's from another, see where I am going here... reason is I have less then $100 in all of them, and I have many many spare parts.

But my problem is I can not downshift from 5th to 4th. I can go from 5th to 3rd, then to 4th, but not directly. Throttle does not help. I am also getting a gring going into 3rd, but I know that is syncro related.

Any ideas?

Charlie

It in my 93 in the sig...
 
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My 3550, every once in a while after driving it really hard, will NOT shift into 4th from 5th no matter what you do. The funny thing is, it almost acts like a heat problem, because it usually happens at the track after a pass, and i'll let the engine cool down and then it'll shift just fine.