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Discussion Starter · #1 ·
See my original thread here:

Long story short - used 6MT - notchy since day one. Installed shift skip eliminator, replaced trans fluid and removed clutch delay valve. Dealership found a missing pin from one of the shafts going into the gearbox, so it was lopsided but still felt notchy. Just got my car back again from the dealer who found gunked up input shaft. Removed, cleaned, lubricated. Chrysler rep says "it drives as designed". Would they need to open up the trans to find that out? Now I'm wondering if they actually looked at the synchros or if they were like yeah this is fine and are kind of avoiding going that route.

Shifts do feel smoother. Reverse and first are better. Second is still wonky. Sometimes it slides right down perfectly. Other teams I'm pushing past one and two notches to get it into gear. Sometimes if I don't get it all the way, it will not engage at all, slip out of gear or grind.

So people have mentioned these types of things with TREMEC 6060s. I can live with it, but I'll do whatever I can to make it as smooth as possible since it's my daily driver. My next step is to try royal purple trans fluid, but I'm guessing that would only make it feel a little smoother but it would probably still be notchy.

Want to try to get this resolved or as smooth as possible before putting my barton shifter back in, since that seemed to make the problem and more noticeable as the shifts are stiffer if you will.

So, is this normal? Should I continue trying to get to the bottom of it? Maybe have a challenger owner drive it and tell me if that's just the way it is? Do they need to get in there and look at the synchros after all if they didn't already?

Just looking for the experience of other 6MT drivers and their day-to-day experience.
 

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I recently found out about the sticky input shaft issues, so as I'm a little far away from the nearest dealer, I took a look myself last weekend, cleaned and lubed the input shaft splines.

It has certainly helped. I'm using a Barton shifter (with original level) with one of the 6th gear springs removed, having already removed the delay valve.

It's not a light weight shift as say my Caterham is, but considering its a reasonably heavy duty box (compared to my usual cars) I don't think it's too bad.
 

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Discussion Starter · #3 ·
Thanks for the info. Do you think the synchros need a look or is this kind of a standard thing on this transmission that people have worked around? I guess I'm still figuring out if this is kinda normal for this trans or if I should keep digging to make it perfect. Sounds like it's somewhat the norm and you can just grease things up to make it smoother.

Cool that you have the experience to pull apart the tranny yourself. I'm still a noob so I wouldn't feel comfortable going to that length without a professional.
 

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if i remember right guys were changing the syncros out to carbon fiber ones and then it shifts like butter. mt 2012 rt shifted like crap. i did the cvd,skipshift,redline fluid, nothing really helped. i traded it on a 16 srt 392 and that one shifts much better. the 3-4 shift is the worst one and sometimes its fine.
 

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Discussion Starter · #5 ·
if i remember right guys were changing the syncros out to carbon fiber ones and then it shifts like butter. mt 2012 rt shifted like crap. i did the cvd,skipshift,redline fluid, nothing really helped. i traded it on a 16 srt 392 and that one shifts much better. the 3-4 shift is the worst one and sometimes its fine.
Did the SRT have the carbon fiber syncros? Is it not something where you think warranty could cover it and I'd have to go aftermarket to make it shift smoothly??
 

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Notchy TremecTR6060s are well known across the boards. Every car that I've had with one has had notchy 2nd gear shifts. The current car I have does it from 3rd to 4th.
 

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if i remember right guys were changing the syncros out to carbon fiber ones and then it shifts like butter. mt 2012 rt shifted like crap. i did the cvd,skipshift,redline fluid, nothing really helped. i traded it on a 16 srt 392 and that one shifts much better. the 3-4 shift is the worst one and sometimes its fine.
Im going to go ahead and mention I believe all the tremec tr-6060’s including those in the older camaro’s as well came with semi-metallic outter rings and carbon lined inner rings. Guys switch out the carbon for 100% semi-metallic to improve the shift feel as the metallic surface provides better lubricity over the organic material. There is a video of a spry old man with a gt500 on youtube that details and goes through the entire process with a shop, that is also familiar with the problem. It’s a little bit of work, but seems to be all the worthwhile if you are living with a manual car
 

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Tremec now makes their own trans fluid. That's going in my 2019 Shaker after 1000 miles. Changing fluid and removing the clutch delay valve restriction should make it shift like butter. These were designed to work with Dexron III, not the factory ATF+4. This came from a very nice/honest Tremec tech, who at first said he had to recommend the factory juice, but that using DEX III or their oil was the correct way to go............and I am.
 

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Tremec now makes their own trans fluid. That's going in my 2019 Shaker after 1000 miles. Changing fluid and removing the clutch delay valve restriction should make it shift like butter. These were designed to work with Dexron III, not the factory ATF+4. This came from a very nice/honest Tremec tech, who at first said he had to recommend the factory juice, but that using DEX III or their oil was the correct way to go............and I am.
Is this the fluid you're talking about?
 

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Discussion Starter · #12 ·
For those following along, the car was taken to a different dodge dealer. Service manager could feel the problem when I let him drive. Chrysler trans specialist said he could not feel it and they're not willing to go in "looking for trouble" if they can't feel that there's an issue. They asked that I keep an eye on it and see if it gets worth over the cost of my factory warranty (2015 vehicle). I asked if they would open up the trans and I would pay the bill if they didn't find an issue and they are getting back to me. It's starting to feel like this "issue" may be an improvement to the transmission rather than considered an issue, so I may have to pay out of picket to get it the way I like it. I can live with that but I'll do my best to get Chrysler to pay to give me the car I want!
 

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Discussion Starter · #14 ·
So I would just need to figure out how to put them in myself? Or find a body shop not associated with Chrysler/Dodge? I'm wondering if I should just try changing to the Tremec high performance manual fluid and see how it is.. if things are still crappy once I put the barton back in, I go the replacing synchros route.
 
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