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I have a bad 3rd gear synchro on my 2007 v6 6 speed manual Tacoma, which results in grinding when shifting 2nd->3rd gear if not done super carefully. As I feel confident in my mechanical aptitude, having completed many smaller jobs to this point, I am eying a complete tranny rebuild as my next challenge.

However, taking down a tranny and taking it apart is quite an ordeal so I might as well replace everything that should be replaced at that point rather than just the 3rd gear synchro. Can you help me identify a list of items that I should replace?

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I had the '05 version of your truck.

Here's my old list out of a notebook.

  • All synchro rings. 2nd, 3rd and 5th are multi piece. 1st to 2nd and 3rd to 4th are coil springs

  • Roller bearings (Input shaft and Main Shaft, Counter Shaft)

  • Front and rear seals

  • Pocket Bearing

  • ALL Gaskets

  • Shift fork inserts

I"m sure you were hoping for something more comprehensive but this is all I really have for you. Good luck. It's a fun job.

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    I would also suggest replacing the blocking ring and gear for the for the gear that's grinding. The teeth that make the engagement may be damaged or worn from the grinding. Just as a precaution. – vini_i Sep 28 '15 at 1:36

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