Slight shutter......

AFM blows anyway. Saving gas at the cost of oil consumption

I was wondering if there was any updates/fixes for this issue?

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I think I have this issue. If you put the truck in tow mode it goes away...Must be afm related?

When you are pulling up to a light, shift the gear selector into neutral as you slow to a stop. That'll tell you if the issue is in the transmission.

It stops...but it also stops when in tow mode and also does not do it if i slow down gently and hit idle speeds and it is in v8 mode. I just ordered a Range V8 to disable AFM. I wanted one anyway and I found the info in this thread made me pull the trigger

I did have the transmission folks replace the filter and fluid...They reported the transmission fluid was fine, just old and found nothing in the pan to report. When they checked the converter they said it looked fine. It's not that noticeable unless you are braking from a top speed of 50-60mph. Thanks for the info

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Didn't mean to threadjack here -> http://www.tahoeyukonforum.com/forum/showthread.php?p=841440#post841440

Since the guys in the thread reported AFM del stops the shudder, I went ahead and ordered a Range V8 AFM Disable. I have a slight oil consumption issue and hope it slows if not cures that issue as well. Plus, driving in tow mode appears to be better performing. I will report what happens after the V8 gets here.

I don't think disabling DOD/AFM eliminates the shudder, it does however stop your oil consumption.
Driving in Tow mode takes it out of OD, is this correct?
I do not have Tow mode in my PPV. If I drop mine down to third, it drives like it would in Tow mode.

My understanding is tow mode can still lock up. If I put it in tow mode, my hoe will be about 1900RPM on the highway at 70ish...same as if in D.

I will report what happens, but i really think this is an AFM issue. At least I hope it is.

goodinblack said:

AFM blows anyway. Saving gas at the cost of oil consumption

Click to expand...

Lol. So true.

Well, the Range stops the shuddering. I just had it delivered to the house, plugged it in and went for a 15 minute drive with about 10 full stops, speeds up to 70MPH. Not a single shudder. The blue light is annoying and the installation card says to pull the unit if it sits due to electrical draw...but it does keep it in V8 permanently. No codes.

Anectdotals:
- Appears to idle smoother
- Shifts a lot smoother
- Instant throttle

I will report later on mileage gains/losses. Also report on oil consumption. I am typically a pessimist...I don't always buy hype, but when you read reviews that this little box makes the truck a much better drive, in my case, it proved true. It feels like I am driving a 2006 Tahoe.

we notice the 4-8 shutter in our 08 and also the mysterious erratic idle / shake..If you can report back in a few days on the Range unit, please..
Thanks,