4th Gear Synchro Problem

[Canman2531]

I switched from the 10-spline to a 26-spline input shaft when I changed my clutch. I spent a lot of time making sure the shims and end play were perfect, but now the trans grinds anytime I try to shift into 4th gear other than from a very slow speed.

I talked to Tremec--and a shop that Tremec recommended--and they both guessed it was a problem with the 4th gear synchro. As it turns out, 4th gear is right where I was messing with the input shaft, so this makes sense.

Once the transmission is out, what do I need to do (if the synchro is the problem)? Is this something I can address without taking the whole transmission apart? Can I work from just the open end where the input shaft is? What parts do you think I need to get? I’ve included a diagram from Tremec.

Thanks again everyone.

 

[Four Door SVT]

You must start at the tail shaft and you need some special tools

Looong pullers and press

 

[Canman2531]

When I changed input shafts, the 4th gear blocker ring did fall out. I didn't think much of it at the time, but I put it back how it fell out (I think). Should that have been able to happen? Could I have reinstalled it wrong? Would that create the problems I'm having?

 

[Canman2531]

You must start at the tail shaft and you need some special tools

Looong pullers and press

I'm guessing this means that I can't just switch the 4th gear synchro from the big opening?

 

[Four Door SVT]

No. Everything pulls off the other end. You can replace the bearing and input tube from the end you pulled