Fresh T-5 pops out of 5th gear only

Each synchro assbly has 3 "keys" that serve to hold the syncro in the engaged position. The "keys" look like small metal
boxes and are held in place by a wire spring inside the synchro assembly. My guess is that the spring has slipped out of
place and the "keys" no longer have spring tension on them to hold the synchro assembly in the engaged position.



46 is the spring
47 is the sleeve
48 is the "key"
49 is the sychnro hub

See TTC: Product Literature to download a
FREE service manual for T5 or Tremec 3550/TKO
You will need the Adobe Acrobat viewer which is also a free download – Adobe - Adobe Reader Download - All versions

See Hanlon Motorsports - T5 and Tremec parts, sales and service or
D & D Performance for parts

A T5 rebuild kit with syncros, bearings and other small parts costs about $160. It does not include any gears or shafts.

Hanlon Motorsports - T5 and Tremec parts, sales and service also has a
video on how to rebuild your T5 or Tremec. It costs about $20, and is worth every penny of it.

I did a Tremec 3550 rebuild, and it wasn't that difficult. The video was an immense help, and I would recommend viewing it.
At $20, it will give you an opportunity to look and decide for yourself if you think that it is something you want to try to do.