Allison shift quality

Looking for advise on some tans shift quality, specifically the Allison 6 speed. Im running a built trans with billet triple disk converter that stalls to 2300,and granted Im not sure what to expect as normal, or abnormal. This trans has a c1-c4 clutch set, transgo jr shift kit, radiotech regulator spring (no shims) and Mike L trim springs. 2k miles on trans relearn at rebuild. Day to day it shift great, converter lock is very firm and can kill boost at times depending on what rpm it locks. Secondly reverse to park and vise versa, it seems to stall for a brief second and then go into gear hard especially reverse. I have data logged on coming and off going clutch line pressure, and comparing a good transition to a laggy or harsh one, the pressure and timing all look very comparable. Anyways wondering if yall have any experience with a built Allision and what to expect as "normal". I have a popular TCM tune loaded, but wouldn't mind playing with some trans tuning at some point. As Im learning the "one size fits all" tuning approach doesn't necessarily fit all.

Thanks in advance.

Jake

Jake,

On occasion I've seen mismatched operating systems cause the issues you describe. If I were me I would first return six speed controller to the original O.S. for the truck and then apply changes from there.

My hunch is that'll clean up your harsh lockup and garage shift delays.

Nick

Hey Nick, thanks for the reply. So I have the OE file I read form the TCM before I loaded the aftermarket one. Your recommending I load a modified copy of my OE file back into the TCM correct? Would you have any advise on critical changes to a OE TCM file that would best suit my setup? (daily driver, tow pig, 30 overs stock turbo for now ect nothing crazy) Do you have any plans to teach a Allison class? The tables look fairly straight forward, but im sure there is a lot to uncover there.

Thanks

Jake

Simply loading the stock file will tell you a lot about if the O.S. is the issue. With a stock turbo it should drive decently on the stock shift points as long as the engine torque curve isn't full front loaded on the acc pedal.

I don't have plans to do an Allison class at this time, sorry Jake.

-Nick

I will give this a try and see if it improves. Shouldn't I be able to compare the OS info for verification?

Side note; In the trans tables there is a torque limit table that look like it is working in conjunction with the ecm. Will this table hold back my engine tuning as I think it might? Can I max out this table so its not affecting engine torque calls?