guessg

I have a 2007 suburban! I know wrong forum! But this one has more info on the 2007s. It has 700 miles on it and recently I have been experiencing a strange vibration in the driver side floor board area, pedals, and in the steering wheel at around 1500rpms. Shifting into second gear also causes this to happen. Somebody else in this forum also had this problem. In the Edmunds forum a post mentioned this problem and they said the dealer replaced the torque conveter. Hence the recall question. Any advice?

ZX1100F1

Correct, this is a well documented problem that effects a few vehicles here is the TSB for this:


Document ID# 1855881
Subject: 4L60-E, 4L65-E, 4L70-E, Automatic Transmission High Pitched Whine, Whistle, Chirp or Buzz Type Noise at 1,500-1,800 RPM (replace with Updated Torque Converter) #06-07-30-017A - (08/16/2006)

Condition
Some customers may comment on a high pitched whistle or whine type noise at approximately 1,500-1,800 rpm while in any forward gear with the torque converter clutch (TCC) disengaged. This noise is typically easier to duplicate when driving up a slight grade when accelerating. This noise will stop when the TCC is engaged. Some 2007 vehicles have been reported to exhibit this noise in 1st gear at approximately 16 km/h (10 mph) with 30-50% TPS on a launch from a stop.

Cause
The torque converter pump blade may cause this condition. A torque converter pump blade revision is expected in production by the end of July, 2006.

Correction
To determine the location of the noise, use the chassis ears with a small acoustic clip-on microphone (such as Radio Shack P/N 33-3013) plugged into the chassis ear amplifier. Drive the vehicle to duplicate the concern using the chassis ears and the Tech 2 to apply and release the TCC. If the noise is coming from the bell housing area only, when the TCC is commanded off, replace the torque converter. If the noise is present with the TCC commanded on, this noise is not caused by the torque converter and torque converter replacement will not correct the condition.

New part #17803805
Torque Converter (4L60-E)
model year: 2007
Platform: C/K
Engines: LC9, LH6, LMG, LY2, LY5
Trans Code: M30

jlenkows

Hmmmm. so much for the GM Company Line "It's operating as designed". I'll be calling my service writer tomorrow!!!

As always, thanks for the info ZX!!

guessg

Well my dealer was able to duplicate the problem, but said theTSB addresses a noise not a vibration. The technician said thet when he took it out with the tech 2 device to engage and disengage the torque converter it didn't make a difference. Any other ideas?!

jlenkows

Luckily, my dealer (who's probably sick of me already) ordered a replacement converter based on the TSB and subsequent test results. I'm just waiting for it to come in.

This may sound like a bit of a reach, but try a different dealer. Let them test it and run teh TSB - maybe they'll determine that it's the same thing.