68rfe shifting hard

[CBricker]

Hello all,

Recently added a ATS co-pilot and the full pressure enable kit to boost line pressure. I had the TCM tuned by Dave, which we all know hes good at what he does. My transmission shifts hard especially for the 3-4 shift, wanted to know if this hard shifting will damage anything, was told it isnt good for the drums. transmission is stock besides these mods with 103k on the clock. Thanks! truck is an 08 ram 3500 SRW.

 

[transe]

Did you have the TCM quicklearned after the new tuning and line pressure boost? If not, then I suspect that is what it needs. A dealer (or shop with an appropriate scan tool) can run the quicklearn for you.

 

[CBricker]

Did you have the TCM quicklearned after the new tuning and line pressure boost? If not, then I suspect that is what it needs. A dealer (or shop with an appropriate scan tool) can run the quicklearn for you.

Thanks for replying transengineer, i was told by dave to just drive it easy for 20 to 30 miles with no more then 40 to 50% throttle and i did do that, truck shifts really good, but just wanted to be sure it can take the firm shifts

 

[transe]

If the shift is firm, and the kick you feel is in the forward direction, that should generally be OK. If you feel a momentary jerk, as if you quickly stabbed the brakes (a kick in the reverse direction), that would indicate overlap (three clutches applied at once during the shift), so in that case you would want to do a re-learn.

If you can monitor the TCC state, see if the firm shift is actually the TCC engaging (just after the 3-4 upshift) rather than the 3-4 shift itself. The TCC engagement can be pretty firm sometimes (and again, this is typically not a problem).

 

[CBricker]

If the shift is firm, and the kick you feel is in the forward direction, that should generally be OK. If you feel a momentary jerk, as if you quickly stabbed the brakes (a kick in the reverse direction), that would indicate overlap (three clutches applied at once during the shift), so in that case you would want to do a re-learn.

If you can monitor the TCC state, see if the firm shift is actually the TCC engaging (just after the 3-4 upshift) rather than the 3-4 shift itself. The TCC engagement can be pretty firm sometimes (and again, this is typically not a problem).

Yes it is a foward momentarily foward jerk, and rhe tc locks right before the 3 to 4 shift