Can these tables(H0135, H0136) be used to correct the Allison's speed reading for larger tires?

the speedo calibration is in the ECM tune. The TCM uses those tables for internal calculations, and should be changed to match what the ECM says.

Unless your trying to make it shift at a higher RPM than stock, or lower for economy. Leave the TCM alone. It doesn't need to be changed when the gears or tires are changed like the ECM does to correct for the speedo..

Unless your trying to make it shift at a higher RPM than stock, or lower for economy. Leave the TCM alone. It doesn't need to be changed when the gears or tires are changed like the ECM does to correct for the speedo..

Incorrect. I may have left that reply a little vague though. H0136 in the ECM and TCM should match not the rest...

Incorrect. I may have left that reply a little vague though. H0136 in the ECM and TCM should match not the rest...
"H0136" does not exist in my 01 ECM, your 03 might not have it either.

I would like to raise the WOT shifts to 3400-3500 to help out my stock trans a little.

I would like to raise the WOT shifts to 3400-3500 to help out my stock trans a little.

Unless your heads have been ported, likely you'll see a loss of power. The stock LB7 heads choke around the redline is what I was told. I know I didn't get any improvement by raising mine, but actually made it stronger when I made it to keep it right at 3200-3250(this was done in the ECM, not the TCM). And there is NO reason to alter ANYTHING in the TCM unless you want to raise or lower shift points. Tuning the speedo in the TCM will just cause you to have to change all the other tables to match, and we can only see a small portion of what is in the TCM via EFILIVE(maybe 1-2% of what is in it).

So when changing tire size to make the speedo read correctly, you should only do the speedo table in the ecm?

So when changing tire size to make the speedo read correctly, you should only do the speedo table in the ecm?

That's the only one that needs to be changed. The TCM has no input at all on the speedo read-out, and it's settings are strictly for internal calculations. If you change gear ratios or tire sizes, for the most part you still want the truck to shift at the same RPM's at the engine. To obtain this you leave the TCM settings alone. The TCM uses 3 speed signals for shift calculations(engine or turbine speed, input shaft speed, and output shaft), and none of them are changed when you change gears or tires.

Thats why I want to raise the shift points, to get it out of the peak torque to make the shifts a little easier.

Thats why I want to raise the shift points, to get it out of the peak torque to make the shifts a little easier.

That can easily be adjusted out in the ECM using table B0741. Otherwise you will have to make ALOT of changes to your ECM OS to make it wind up higher and not shut-off and hang the gears.

That can easily be adjusted out in the ECM using table B0741. Otherwise you will have to make ALOT of changes to your ECM OS to make it wind up higher and not shut-off and hang the gears.

What do you mean by using the B0741 table? Do you mean that you can raise shift points in this table or that I can reduce fuel to make it shift easier?

What do you mean by using the B0741 table? Do you mean that you can raise shift points in this table or that I can reduce fuel to make it shift easier?

You can custom tailor exactly how it will fuel on the shifts with B0741. Also make sure that your pulse width tables are set-up progressive with the changes getting bigger as you go to the bottom right of the table. The ECM tuning controls how it will shift, the TCM just makes a torque request based off of it's programmed parametrs.