bad tranny synchro? - Toyota Nation Forum : Toyota Car and Truck Forums

Drifty_Mc_Deuce · 03-29-2005, 11:55 AM

I've heard that the tranny sychros often wear out or go bad in the MR2. My '91 N/A does not seem to want to downshift into second without me rev-matching to around 4 1/2 - 5k or more, else I get a wicked grind. Is this possibly a synchro issue? If so how much of a pain is it to fix this? I haven't changed the fluid yet so I may start with that. Any advice would be greatly appreciated. Thanks.

JekylandHyde · 03-29-2005, 01:08 PM

If you are grinding gears, it is most likely the syncros.
Unfortunately, the tranny needs to be pulled and opened up to fix them.

billhamilton002 · 03-29-2005, 03:12 PM

I had the same problem when I got my '91 N/A that I could not downshift from 3rd to 2nd or even all time shift from 1st to 2nd with out hearing a little grinding sound. You said you have not changed the tranny fluid, that's what I did to fix my problem. I Put in Pennzoil Syncromesh I got it from Autozone for about 4 bucks a qt. I only put 1Qt of this stuff and the rest with regular tranny fluid, and my upshifts and downshifts are smooth now...

JekylandHyde · 03-30-2005, 05:28 AM

Using Syncromesh after your gears have already started to grind is a band aid. It will help get some more distance out of your tranny, but ultimately it is going to need to be replaced.

I highly recommend using a good tranny fluid right from the start. I use the Redline MTL. I have also used the GM Syncromesh. Both are a bit pricey at around $10/quart.