Trans pops out of 3rd

[Marty Rogan]

I have an early 71, with the type A trans. The trans was rebuilt about 10k miles ago. One time it popped out of 3rd gear on me, and didn't happen again. I thought maybe I didn't engage it fully.

Well, the thow-out bearing had seized and was making noise, so I pulled it out and changed it last week. While I had the trans out, I replaced the shifter bushings with a NISMO bushing kit. It replaces the rubber bushings with aluminum ones and takes all the slop out of the type A trans. Replaced the inner shift boot as well, since it was ripped.

Saturday, I was a track day. Numerous times while declerating in 3rd (under hard braking) it kept popping out of gear. Not a very endearing quality while you are on the track!!! It doesn't pop out under accelleration thankfully. I got through the day by hold the shift lever.

Any ideas on why this could be occuring?

Marty

[gramercyjam]

That happens to my 5 speed at the track with an inner shift boot on. I took it off and the problem went away. There's probably a way to fix it internally in the tranny, but I'll live with it until I need to take it apart for a better reason.

[Marty Rogan]

My first thought was that the inner shift boot must have been pretty stiff. It would not be very practical to drive around without one, especially if you get caught in the rain!

Marty

[gramercyjam]

I use one of the rubber ZX shifter boots so nothing comes in. Besides, I'd more concerned about rain coming in the side windows since I have no glass there!

[beandip]

if the adjustments on the linkage is right and the boot or anything else is not preventing the trans form going into gear , then it is likely the sincromesh that is worn in the trans. If you are not familure with what that is , it's the ''cluch'' that slows the gears down when you shift and aligns them so everything meshes when you shift . Upon decelleration the trans will pop out of gear. Hope this helps. Gary

[Marty Rogan]

Beandip,

Is that the clutch slave cylinder adjustment that you are referring to. as "the linkage"?

It seems to go into gear fine. Especially with the NISMO busshings, it has a much more positive feel when going into gear.

I have had bad synchros on other 240's. It usually shows up as crunching while going into gear. I don't get that on this car. Would the sychros really go out on a trans with only 10K on it???

Marty