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Suburban shifting/rear end issue #4688632
03/08/18 11:23 AM
03/08/18 11:23 AM
Joined: Jan 2007
Posts: 806
El Oeste
HawkeyeScott Offline OP
HawkeyeScott  Offline OP
Joined: Jan 2007
Posts: 806
El Oeste
Iím trying to diagnose something Iíve noticed the last few months in my 2008 Suburban 1500. It may be one issue or a couple.

The 4L60E shifts perfectly from 1 to 2. 2 to 3, though, is almost always soft. Itís not a slip or hesitation as much as it is what Iíd describe a nosedive of momentum. 3 to 4 seems perfectly fine, FWIW. Both shift solenoids were replaced with OEM about 12,000 miles ago. If I accelerate a little more aggressively, the problem seems to subside. Some 2-3 shifts are just fine. I didnít really notice this when I bought it a year ago, but it may have been there.

Iíve also started to notice a small clunk or thunk that seems to coincide with shifts. It seems to be downstream of the transmission - maybe driveshaft or the rear end. (Itís not quite the same, but it reminds me of issues I had with a 2001 Jeep Cherokee. They were caused by an ungreased slip yoke.) Thereís also a little play in the driveline, a slight hesitation between acceleration and engagement in the differential. I call it slack. The same Jeep had this issue, albeit considerably more advanced, and it was solved by new spider gears.

The truck has 121,00 miles on it. Transmission fluid is good and at the correct level. The gear oil in the diff. is a synthetic with 12,000 miles on it.
FWIW, none of this is to the point that the average driver would notice any of this. Just being a car OCD BITOGer, itís bugging me.

Any ideas? I'd appreciate your thoughts.

Re: Suburban shifting/rear end issue [Re: HawkeyeScott] #4688644
03/08/18 11:40 AM
03/08/18 11:40 AM
Joined: Aug 2011
Posts: 3,264
n.c.
gman2304 Offline
gman2304  Offline
Joined: Aug 2011
Posts: 3,264
n.c.
My 2005 1500 Avalanche had similar issues a year or so ago. Replaced the drive shaft U joints and all is good.

Re: Suburban shifting/rear end issue [Re: HawkeyeScott] #4688674
03/08/18 12:05 PM
03/08/18 12:05 PM
Joined: Dec 2017
Posts: 2,990
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 2,990
SE British Columbia, Canada
What transmission fluid is in the tranny?


If you want the job done right......do it yourself.
Re: Suburban shifting/rear end issue [Re: Snagglefoot] #4688684
03/08/18 12:14 PM
03/08/18 12:14 PM
Joined: Dec 2017
Posts: 2,990
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 2,990
SE British Columbia, Canada
Your transmission came with Dexron III but is superseded by Dexron VI.


If you want the job done right......do it yourself.
Re: Suburban shifting/rear end issue [Re: HawkeyeScott] #4688687
03/08/18 12:19 PM
03/08/18 12:19 PM
Joined: Jan 2007
Posts: 806
El Oeste
HawkeyeScott Offline OP
HawkeyeScott  Offline OP
Joined: Jan 2007
Posts: 806
El Oeste
SuperTech Dexron VI. I dropped the pan last year when I first got it. Did the pan filter and the solenoids and then added a cooler and inline filter a few months later. Also a pan plug to make drains/refills 100X easier.

Last edited by HawkeyeScott; 03/08/18 12:20 PM.
Re: Suburban shifting/rear end issue [Re: HawkeyeScott] #4688690
03/08/18 12:20 PM
03/08/18 12:20 PM
Joined: Dec 2006
Posts: 8,450
Illinois
mrsilv04 Offline
mrsilv04  Offline
Joined: Dec 2006
Posts: 8,450
Illinois
Have the u-joints checked for play.


2004 Silverado - on its 3rd Jasper engine in less than one year.
Re: Suburban shifting/rear end issue [Re: HawkeyeScott] #4688717
03/08/18 01:00 PM
03/08/18 01:00 PM
Joined: Jan 2013
Posts: 2,084
Texas
WyrTwister Offline
WyrTwister  Offline
Joined: Jan 2013
Posts: 2,084
Texas
Originally Posted By: HawkeyeScott
SuperTech Dexron VI. I dropped the pan last year when I first got it. Did the pan filter and the solenoids and then added a cooler and inline filter a few months later. Also a pan plug to make drains/refills 100X easier.


Just a stab in the dark , temporarily take the inline filter out & test drive for a few days . When / if you put it back , make sure the filter is not directional . If it is , be sure to install it in the right orientation .

And , yes , while you are att it , check the u-joints .


Wyr
God bless
Re: Suburban shifting/rear end issue [Re: HawkeyeScott] #4688818
03/08/18 03:00 PM
03/08/18 03:00 PM
Joined: Jan 2007
Posts: 806
El Oeste
HawkeyeScott Offline OP
HawkeyeScott  Offline OP
Joined: Jan 2007
Posts: 806
El Oeste
Thanks, everyone. U joints had crossed my mind when this first started. I'd love it if that's the issue.

Re: Suburban shifting/rear end issue [Re: HawkeyeScott] #4688997
03/08/18 06:30 PM
03/08/18 06:30 PM
Joined: Aug 2004
Posts: 1,404
VA
Rhymingmechanic Offline
Rhymingmechanic  Offline
Joined: Aug 2004
Posts: 1,404
VA
There was a lot of talk about re-greasing a driveshaft yoke or slip joint in the early years of the new body style. I don't know how long that continued.

I bought a 2001 Silverado new, and would say the 2-3 shift has always been softer than 1-2. The 700R4 in my '87 Caprice acted the same way, even with a shift kit.

Re: Suburban shifting/rear end issue [Re: HawkeyeScott] #4709634
03/28/18 12:32 PM
03/28/18 12:32 PM
Joined: Jan 2007
Posts: 806
El Oeste
HawkeyeScott Offline OP
HawkeyeScott  Offline OP
Joined: Jan 2007
Posts: 806
El Oeste
Just to close the loop on this in case others find this thread. I finally figured out what was going on. After "greasing" the slip yoke (with ATF) and putting in new (greasable!) Spicer U-joints, nothing changed. I decided to replace the transmission mount. This actually helped, but didn't solve the problem. So I kept thinking and thinking and finally popped the hood and checked the motor mounts.

In the end, it was a broken driver's side motor mount. What I was feeling was the movement of the engine/tranny when it shifted. It wasn't completely torn, but it had failed enough that the driver's side of the engine was lifting an inch or so under heavier load.

I spent the money on new OEM, had it installed this morning and finally, she's fixed. Now, back to life.

Re: Suburban shifting/rear end issue [Re: HawkeyeScott] #4709910
03/28/18 05:28 PM
03/28/18 05:28 PM
Joined: Jan 2013
Posts: 2,084
Texas
WyrTwister Offline
WyrTwister  Offline
Joined: Jan 2013
Posts: 2,084
Texas
Good to hear you got it fixes . :-)

Congrats !


Wyr
God bless

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