I haven't ever reset my taps, but maybe you haven't given it time if you've been resetting them so much. Try running a stock tune an leaving it alone for a while. Time will tell you if it's tuning or trans.
really hard 3rd to 4th upshift
- Thread starter Chevy1925
- Start date
I haven't ever reset my taps, but maybe you haven't given it time if you've been resetting them so much. Try running a stock tune an leaving it alone for a while. Time will tell you if it's tuning or trans.
Pretty sure the ECM tune accounts for the tire size. We tried stock and actual tire sizes in the tune and made no difference. Tried same tune in a couple LB7s including one with pretty much same setup/tire size and the issue isnt there (however these are stock trans trucks). I am at a loss on this one.
James has been begging me for a TCM tune, but I am afraid that wont help either. Ill shoot you that TCM tune over tomorrow that adjust the shift points and lets see if that helps any (i doubt it, but..).
I think I sent you a med-hot single tune over before to check and the problem was still there correct? Let me put a ECM tune together also with something totally off the wall (I have an idea
) and see if the problem gets worse or stays the same.
James has been begging me for a TCM tune, but I am afraid that wont help either. Ill shoot you that TCM tune over tomorrow that adjust the shift points and lets see if that helps any (i doubt it, but..).
I think I sent you a med-hot single tune over before to check and the problem was still there correct? Let me put a ECM tune together also with something totally off the wall (I have an idea
) and see if the problem gets worse or stays the same.
sorry i if miss lead you, i only clear the 3-4th up shift. i dont clear all of them. Ive done it probably 5 times in 15k
yeah i know about eh rail pressure, mike sent me a new tune that brought it back up but shifts never got better.
trust me, i put plenty of time on the TCM to relearn the 3rd-4th up shift (only tap i clear, sorry if i mis lead that). i put close to 3-5k each time (kinda why i had not posted in a while in this thread). Ill run it easy for a day or so, then run a few weeks hard, and drive it hard on the highway when i can. i know its not straight driving it hard all the time but i cant and i know lots of guys that drive them easy for weeks, get on it hard and have a bad shift but right after, they get back on it hard it shifts nice
Pretty sure the ECM tune accounts for the tire size. We tried stock and actual tire sizes in the tune and made no difference. Tried same tune in a couple LB7s including one with pretty much same setup/tire size and the issue isnt there (however these are stock trans trucks). I am at a loss on this one.
James has been begging me for a TCM tune, but I am afraid that wont help either. Ill shoot you that TCM tune over tomorrow that adjust the shift points and lets see if that helps any (i doubt it, but..).
I think I sent you a med-hot single tune over before to check and the problem was still there correct? Let me put a ECM tune together also with something totally off the wall (I have an idea
Na, i know you built it but i never got an email from you to try loadin it up and runnin it. i think it was the one you tried in your buddies truck that you took to mike L. when he had the tranny built. Let me know what you got, im jsut out of ideas now.
yeah, i jsut wish i understood the tranny and tuning more. i hate feeling like i cant fix my truck and depend on other (absolutly nothing against you mike or mike L.), im jsut one of those that likes to know exactly what i can or cant do to figure it out. im out of knowledge but i know being on this forum, im surrounded by many guys who can teach me that information
yeah, i jsut wish i understood the tranny and tuning more. i hate feeling like i cant fix my truck and depend on other (absolutly nothing against you mike or mike L.), im jsut one of those that likes to know exactly what i can or cant do to figure it out. im out of knowledge but i know being on this forum, im surrounded by many guys who can teach me that information
We will get to the bottom of this.
If it were my truck, and I were running a stock tune and my trans was shifting weird with new filters, Id suspect it were the transmission itself. Seems to be the most simple answer is usually the one to look to. Only bad part is that you have to pull the trans out to really see
i know mike, i have lots of faith in you and mike m. :happy2:
If it were my truck, and I were running a stock tune and my trans was shifting weird with new filters, Id suspect it were the transmission itself. Seems to be the most simple answer is usually the one to look to. Only bad part is that you have to pull the trans out to really see
i agree and thats the first thing i thought way back when as it started right after i had the trans built but mike said my trans was so trashed, its not worth comparing too lol. Id bring it back to mike before i pulled the trans, im like a retard with his first boner, i aint a damn clue what to do :spit:
I just meant it needs to be dropped in general. Not you have to do it yourself haha. I'm sure it'd get figured out if you pulled it apart. Either way somethings not right in there. That conclusion is easyto reach.
Unfortuneatley this is often what is needed to find the issue. One little spring or valve could be in wrong or a tolerance could be off just a little bit. Ive learned it the hard way myself many times.
I think I posted in the other thread but I've ran my stock TCM tune for a week now and all's well, still not sure why w/o a change to the tune why it started this.
I think its a duramax thing. I know of a few trucks that with no change to the tune, simply reflashing them makes them run good again.
i agree but mike L. seems to think different. I had him build the trans. Im not sure if i have gone through all the proper diags. to say for sure i would be something in the trans but Mike M. has some things he wants to try first i think. I need to call mike L. monday and pick his brain on it.
Ive tried reflashing and a totally different TCM to see if it would change it but nothing changed
i agree but mike L. seems to think different. I had him build the trans. Im not sure if i have gone through all the proper diags. to say for sure i would be something in the trans but Mike M. has some things he wants to try first i think. I need to call mike L. monday and pick his brain on it.
/QUOTE]
If there is one thing i know about Mike, it is that he never runs from a problem he enjoys a challenge
i agree but mike L. seems to think different. I had him build the trans. Im not sure if i have gone through all the proper diags. to say for sure i would be something in the trans but Mike M. has some things he wants to try first i think. I need to call mike L. monday and pick his brain on it.
/QUOTE]
If there is one thing i know about Mike, it is that he never runs from a problem he enjoys a challenge
Exactly. Mike and his crew do top notch work. Some of the best around. But everyone is human, maybe something wasnt right, who knows.
it seems like all built allisons have a rough 3-4 upshift. If its not too much work for you maybe drive back over to inglewood trans and have mike take it for a spin with you to see if he thinks it is abnormal. hes not a crooked guy he will tell you if its not right.
Good luck.
did you do a full flash ? If so it will reset the taps.
And to the OP I can let you try an ECM / TCM combo to test , as long as i can trust the tune being kept private, i don't mind helping , with as many problems as you have had trying to solve this .
Have you been checking your spin on filter for debris? Have you dropped your pan to check for debris? The only time I've ever had an issue that had erratic shifting there was a lot of debris on the magnet of the spin on and on my pan magnet. It ended up be a failed bearing that took out quite a few parts. Suncoast did take care of the problem though.
