Will a 6 pinion planet gear work in 4L65E

[MyM8V8]

Hi,

We are building a new box for next year and are considering installing a new 6 pinion planet gear in place of the stock 5 gear one to even out the ratios.

Is it possible to reprogramme the gear ratios to suit this set up without any issues?

Thanks in anticipation. Gareth.

[joecar]

Gareth,

Do you mean the 6-pinion gearset from PATC (find "6 pinion" on this page): www.transmissioncenter.net/4l60e.htm

My understanding is that the gearset fits the 4L65E (4L65E is interchangeable with 4L60E)... but, to be sure contact PATC and ask them directly.

The PCM transmission calibration has editable gear ratios, see D1201-2 and D4601... set these to 1st=2.84 and 2nd=1.56.

I do like the closer ratios, you don't need as loose a stall converter as you do with the stock ratios.

[N0DIH]

$1100+....owch....

[MyM8V8]

Gareth,

Do you mean the 6-pinion gearset from PATC (find "6 pinion" on this page): www.transmissioncenter.net/4l60e.htm

My understanding is that the gearset fits the 4L65E (4L65E is interchangeable with 4L60E)... but, to be sure contact PATC and ask them directly.

The PCM transmission calibration has editable gear ratios, see D1201-2 and D4601... set these to 1st=2.84 and 2nd=1.56.

I do like the closer ratios, you don't need as loose a stall converter as you do with the stock ratios.

Yes, Joe, that's the one. I suppose the stall is also affected by where the cam is as well, but there is a definite advantage to having a tighter stall when you have a dual purpose truck, i.e. street/strip.


What I was really getting at was; with the gearbox ratio calibration applet, I recall vaguely there were some issues with the software and calculations and I did have problems using it to (unsuccessfuly) recalibrate my speedo from kmh to mph.

It would be handy to know if there are any guys who have used it to change the ratios successfully in similar circumstances. What worried me was on the PATC site it referred to certian setups throwing ratio codes. So I thought I'd just check here first.

As NOD1H has said, it's a lot of money if it don't work, but if it does, it could be the best upgrade in the box (Well apart from a 300m input drum).

[joecar]

You mean the Speedo Calculator... the speedo comes from the VSS signal which is taken from the reluctor on the trans output shaft... changing the trans internal gear ratios doesn't change VSS relationship to the output shaft...

I would just manually calculate and edit all the tables that are affected by a VSS relationship change.

Someone here (slow67) is running a 4L80E on a 4L60E calibration (to keep the TCC locked at zero throttle)... it seems he did not edit in the 4L80E gear ratios (2.48, 1.48, 1.00, 0.75) so he got some codes: showthread.php?t=11975

It will throw codes if the calibration is not edited with the new ratios... the PCM computes in each gear what the RPM:VSS ratio should be based on the current gear ratio and whether the TCC is locked... if it does not agree then a code is set.

You may have to edit the 1->2, 2->1, 2->3, 3->2 shift tables (PT and WOT) since 1st and 2nd gear are now numerically lower (the max (engine redline) MPH in 1st and 2nd is now higher).

It's a lot of money, but you get various benefits: it's stronger than the 4 or 5 pinion sets, it gives closer gear ratio spacing, allows you to use a tighter stall converter, and others.

[MyM8V8]

Hi Joe,

Wondered if you could help. I am trying to sort out a heavy duty input drum assembly from PATC and I'm not quite sure which one I need?

There are two available, one for 2007 up and one for before. The difference is the reluctor for the speed sensor on the shaft.

I have a 2005 in the ute and the one coming from Holmart is a 2006YOM.

They are asking which color case connector I have and I dont; know.

Cheers if you can help.

[ScarabEpic22]

Interesting, that 6 pinion gearset looks really promising. Im going to ask the guys in the TBSS world if it might be a better way to lower E.T.s. Wish it had a higher (numerically lower) OD gear than .70, Id love a .65 or .60 OD gear with these 4.10 gears. Kills the mileage on the hwy when you're spinning about 2600rpms going 75mph. My regular TB with 3.73s spins about 2300 at 75...

[MyM8V8]

Interesting, that 6 pinion gearset looks really promising. Im going to ask the guys in the TBSS world if it might be a better way to lower E.T.s. ...

They're claiming up to 3/10ths.

[joecar]

Hi Joe,

Wondered if you could help. I am trying to sort out a heavy duty input drum assembly from PATC and I'm not quite sure which one I need?

There are two available, one for 2007 up and one for before. The difference is the reluctor for the speed sensor on the shaft.

I have a 2005 in the ute and the one coming from Holmart is a 2006YOM.

They are asking which color case connector I have and I dont; know.

Cheers if you can help.

The input drum/shaft with the reluctor teeth is for the 4L65E/4L70E variants that have the ISS (input speed sensor)...

the stator support shaft has to allow space for the reluctor teeth;

If you don't have the ISS then you want the other input drum...

The electrical connector on the case...?
If you look at it you should be able to see what color it is...
(on RHS of case, on flat "wing" above the pan (rearward of where dipstick tube fits)...
it is most likely Grey... but I don't have any diagrams later than 2005.

[MyM8V8]

The input drum/shaft with the reluctor teeth is for the 4L65E/4L70E variants that have the ISS (input speed sensor)...

the stator support shaft has to allow space for the reluctor teeth;

If you don't have the ISS then you want the other input drum...

The electrical connector on the case...?
If you look at it you should be able to see what color it is...
(on RHS of case, on flat "wing" above the pan (rearward of where dipstick tube fits)...
it is most likely Grey... but I don't have any diagrams later than 2005.

You are right. It is grey. I just need to find out whether I have ISS.

Once again. Thanks Joe.