2-3 shift flare

[henery97]

Built my Allison in my LBZ this spring, along with twins, mild motor build, etc. The build consisted of suncoast raybestos clutches in c2-c4 and alto carbonites in the c1, mikeL pressure spring with no shim, mikeL shift & trim valve springs, & an ML-G converter. The trans shifts AMAZING at full throttle. The only problem I seem to have with it is a 200or so rpm flare on light throttle 2-3 shift. ECM tunes are by Kory & and tcm tune is stock except Tcc tables for slip.

 

[onebaddmaxxx]

Is it something that started recently or done it the whole time? And have you tried resetting the 2-3 tap?

 

[henery97]

It doesn't seem to do it all the time, much more noticeable when it's cold.

 

[Mike L.]

Try going back to stock on the TCM.

 

[henery97]

Try going back to stock on the TCM.

I'll try it but I ran the same TCM tune with my stock trans & had no problems.

 

[king44481]

Built my Allison in my LBZ this spring, along with twins, mild motor build, etc. The build consisted of suncoast raybestos clutches in c2-c4 and alto carbonites in the c1, mikeL pressure spring with no shim, mikeL shift & trim valve springs, & an ML-G converter. The trans shifts AMAZING at full throttle. The only problem I seem to have with it is a 200or so rpm flare on light throttle 2-3 shift. ECM tunes are by Kory & and tcm tune is stock except Tcc tables for slip.

Off topic but, how much did the trans mods and converter run you?

 

[Rancelot211]

Subd

 

[CaptPhil]

is it a flare or is it a surge? I have had some tunes that had a part throttle surge right before the shift, you could feel the truck lunge forward. A flare would be a rapid rise in rpm in between shifts.

 

[WolfLMM]

Hows your fluid level? Mine was doing the same thing 2-3 flare, fluid was right at the low hash on the HOT side. I put about 3/4 quart in and got it on the high side of the HOT hash marks. Shift flare went away.