Recent Topics
Ghetto testing a wheel speed sensor
by Nayov
06/24/18 06:23 AM
dash cam
by DAC2018
06/24/18 05:08 AM
WoO driver Jason Johnson injured
by bdcardinal
06/24/18 01:08 AM
Plastic burning smell when WOT
by Jaha24k
06/24/18 12:57 AM
Duckham's 15w50 Oil 12 one liter bottles
by Lolvoguy
06/24/18 12:00 AM
Ruger LCP .380
by PW01
06/23/18 11:24 PM
Launching boat with stick shift
by troutfisher
06/23/18 11:22 PM
Free oil
by Spitter
06/23/18 10:53 PM
Porsche Panamera buying advice
by CharlieBauer
06/23/18 10:04 PM
RC cars
by red7404
06/23/18 09:36 PM
Any Good 4K Movies ?
by Warstud
06/23/18 09:06 PM
Gray on Oil Dipstick?
by chinee
06/23/18 08:41 PM
Clear plastic scratch remover?
by Quattro Pete
06/23/18 08:15 PM
Parking wars show.
by Chris142
06/23/18 08:15 PM
set for years
by 93cruiser
06/23/18 08:07 PM
Looking to replace 2005 Sienna with SUV
by i6pwr
06/23/18 07:26 PM
Trying to fix chainsaw
by turtlevette
06/23/18 06:48 PM
tire rotation
by marine65
06/23/18 06:48 PM
Reese hitch $30 Walmart YMMV
by pda1122
06/23/18 06:14 PM
Managing Anger During Unexpected Tire Change
by TheLawnRanger
06/23/18 06:14 PM
Newest Members
bwechols, bowupid, pod423, lemaitrix, azzid0906
65303 Registered Users
Who's Online
73 registered (Astro14, andyd, 2009Edge, 1foxracing, 4WD, 5 invisible), 1129 Guests and 69 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65303 Members
67 Forums
285891 Topics
4771074 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#4688632 - 03/08/18 11:23 AM Suburban shifting/rear end issue
HawkeyeScott Offline


Registered: 01/11/07
Posts: 785
Loc: 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.

Top
#4688644 - 03/08/18 11:40 AM Re: Suburban shifting/rear end issue [Re: HawkeyeScott]
gman2304 Offline


Registered: 08/11/11
Posts: 3057
Loc: n.c.
My 2005 1500 Avalanche had similar issues a year or so ago. Replaced the drive shaft U joints and all is good.

Top
#4688674 - 03/08/18 12:05 PM Re: Suburban shifting/rear end issue [Re: HawkeyeScott]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1763
Loc: Alberta
What transmission fluid is in the tranny?

Top
#4688684 - 03/08/18 12:14 PM Re: Suburban shifting/rear end issue [Re: Snagglefoot]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1763
Loc: Alberta
Your transmission came with Dexron III but is superseded by Dexron VI.

Top
#4688687 - 03/08/18 12:19 PM Re: Suburban shifting/rear end issue [Re: HawkeyeScott]
HawkeyeScott Offline


Registered: 01/11/07
Posts: 785
Loc: 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.


Edited by HawkeyeScott (03/08/18 12:20 PM)

Top
#4688690 - 03/08/18 12:20 PM Re: Suburban shifting/rear end issue [Re: HawkeyeScott]
mrsilv04 Offline


Registered: 12/08/06
Posts: 8275
Loc: Illinois
Have the u-joints checked for play.
_________________________
2004 Silverado - on its 3rd Jasper engine in less than one year.

Top
#4688717 - 03/08/18 01:00 PM Re: Suburban shifting/rear end issue [Re: HawkeyeScott]
WyrTwister Offline


Registered: 01/13/13
Posts: 1532
Loc: 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

Top
#4688818 - 03/08/18 03:00 PM Re: Suburban shifting/rear end issue [Re: HawkeyeScott]
HawkeyeScott Offline


Registered: 01/11/07
Posts: 785
Loc: El Oeste
Thanks, everyone. U joints had crossed my mind when this first started. I'd love it if that's the issue.

Top
#4688997 - 03/08/18 06:30 PM Re: Suburban shifting/rear end issue [Re: HawkeyeScott]
Rhymingmechanic Offline


Registered: 08/13/04
Posts: 1327
Loc: 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.

Top
#4709634 - 03/28/18 01:32 PM Re: Suburban shifting/rear end issue [Re: HawkeyeScott]
HawkeyeScott Offline


Registered: 01/11/07
Posts: 785
Loc: 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.

Top
#4709910 - 03/28/18 06:28 PM Re: Suburban shifting/rear end issue [Re: HawkeyeScott]
WyrTwister Offline


Registered: 01/13/13
Posts: 1532
Loc: Texas
Good to hear you got it fixes . :-)

Congrats !
_________________________
Wyr
God bless

Top