Need to hold 4th gear for dyno

Unless you went over 4000 RPM then you should be able to hold it in 4th as long as you want.

Quote:

---

Originally Posted by GMPX

Phil,

Not sure why you can't see the other parameters, however, what you can simply do on the dyno is run the truck up 1st through to 3rd then activate the 4th gear hold once it's up to speed.

Cheers,
Ross

---

Just an FYI, I don't have D5040 or D5041 either, and I'm on the latest build.

Right :unsure:

Quote:

---

Originally Posted by GMPX

Unless you went over 4000 RPM then you should be able to hold it in 4th as long as you want.

---

No sir. All my runs were only to 3500 RPM's. It would shift just like normal if I didn't have the OD button on. Thank's for the help. I too am running the newest version.

Phil

I had an 08 LMM with Allison 6 spd on the dyne today and am having the same problems. I do not have any of B5040 to 45. I did not try OD button. I found the most effective was to manually shift, with DVT, to 4th then lock the TCC but it still was shifting at 3200 (dropping to 2400). Then at 2700 it started dropping RPM again although gradually like the converter is locking and unlocking through the gear changes. Is there a way to have the trans stay in direct with the converter locked.

max out D5003
max out D5023
max out D5028
that should do the trick if you need any more help let me know, Loren

So the only way to holdva gear is by flashing the PCM. The Bidi won't hold it?

this is the only way that i have tried and can honestly say works , just a couple of minutes to flash in and a couple minutes to reflash in your regular tcm tune,Loren

It would sure be nice to use BIDI in the scanner!

yeah the dvt's dont work like they should... i had o make a dyno tune and flash