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 Gen 1 SWB shudder noise at take off when wheels turned.
#1006612
08/20/10 06:18 PM
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Joined: Jul 2010
Posts: 7
OP
Need a Spot
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I perused the archives but could not find out what might be causing my problem. Truck: 88 Montero, SWB 2.6L I4 144K miles and all stock and just about everything works including power windows. Problem: When I first start driving from a cold start there are no issues. After it warms up or after a few miles when I get on pavement and from a stop... when I go forward with the wheels turned in either direction there is a very obvious shudder towards what feels like the rear of the truck. The sticker says it does have a LSD. Not sure if that matters. If I start from a stop with the wheels straight I do not experience the shudder. Truck has auto locking hubs and is set in 2wd. any ideas? <img src="/forums/images/graemlins/zombie.gif" alt="" />
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Re: Gen 1 SWB shudder noise at take off when wheels turned.
[Re: madtabula]
#1006613
08/20/10 07:00 PM
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Joined: Apr 2006
Posts: 1,193
Body Damage is Cool
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change the rear axle oil and put in posi additive
it dosent have to be surrounded by water to be an island
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Re: Gen 1 SWB shudder noise at take off when wheels turned.
[Re: mxmikie]
#1006614
08/20/10 07:44 PM
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Joined: Jan 2001
Posts: 13,649
Web Wheeler
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Yup, that's the lsd clutches grabbing because you don't have the lsd friction modifier in the gear lube. It reduces the friction and lets the clutches slip in normal driving. It's worse in the swb because the short wheelbase makes the torque differences greater side to side.
Not responsible for advice not taken...
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Re: Gen 1 SWB shudder noise at take off when wheels turned.
[Re: madtabula]
#1006615
08/20/10 08:05 PM
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Joined: Jul 2010
Posts: 7
OP
Need a Spot
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Thanks.... sounds like there is a consensus... I'll change the gear oil.... but could someone tell me where to get the posi additive... do I ask for posi additive or LSD additive? Can you get this from like Auto Zone? pardon my ignorance...
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Re: Gen 1 SWB shudder noise at take off when wheels turned.
[Re: madtabula]
#1006616
08/20/10 08:46 PM
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Joined: Feb 2004
Posts: 10,238
Web Wheeler
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Can you get this from like Auto Zone? Yes, that's where I get the additive that I use. Frank
'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
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Re: Gen 1 SWB shudder noise at take off when wheels turned.
[Re: FrankR]
#1006617
08/21/10 06:01 PM
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Joined: Aug 2008
Posts: 530
Rock Warrior
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How often should I change the oil?
Thanks
HUMMER .25: No need to compensate.
1989 Dodge Raider: 3.0/5
1992 Chrysler LeBaron Convertible: 3.0/A
1994 GMC Safari: 4.3/A
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Re: Gen 1 SWB shudder noise at take off when wheels turned.
[Re: WagonMaster]
#1006618
08/21/10 06:07 PM
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Joined: Jan 2001
Posts: 13,649
Web Wheeler
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The book says every 30k, unless you go wading a lot, and axle deep.
Not responsible for advice not taken...
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Re: Gen 1 SWB shudder noise at take off when wheels turned.
[Re: WagonMaster]
#1006619
08/21/10 06:14 PM
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Joined: Feb 2004
Posts: 10,238
Web Wheeler
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I don't know what the recommended interval is, but I just change mine once every year or two. 30,000 miles is probably about as long as you want to go between changes, but since the level should be checked periodically, it's not much more difficult to go ahead and change it while you're checking.
Frank
'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
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Re: Gen 1 SWB shudder noise at take off when wheels turned.
[Re: FrankR]
#1006620
08/22/10 03:56 AM
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Joined: Feb 2001
Posts: 2,356
Body Damage is Cool
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Be sure to remove the fill plug first. You want to be sure you can refill the diff before you remove the drain plug. <img src="/forums/images/graemlins/kewl.gif" alt="" />
Mitsu # 6 - 98 6G72 Montero Sport, Locking Rear Diff, Aisin Manual Hubs, 31x10.5
Mitsu # 7 - 02 6G74 Montero Limited
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Re: Gen 1 SWB shudder noise at take off when wheels turned.
[Re: FrankR]
#1006621
08/22/10 03:11 PM
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Joined: Apr 2007
Posts: 49
Getting the Wheeling Fever
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Frank,
Thanks for all your info on the SWA post as well. Concerning the posi-additive, I just went to Autozone and bought some, but the guy warned that it could ruin my LSD. The brand is Trans-X Posi-Trac and it says its for GM #1052358, Ford #M2C118-A, Chrysler #4318060 and "most imports". Should I worry about putting this stuff in? Is this the same stuff that Mitsu uses?
Thanks!
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