Jump to content

Binding transmission???


Recommended Posts

Posted

My brother has an 05' 2500HD with the Duramax/Allison auto combo. He has less than 6000 miles on the truck and over the last couple of days he has noticed a "binding" sound coming from the trans. only when he is backing up. I have not heard the noise as he lives in Fl. and I am in virginia, but I thought I would jump on here and see if you guys would have any ideas of what the problems could be. The truck is 4x4 crew cab and he has put slightly larger tires on. I believe 295's if I'm not mistaken. He has also turned the front up about an inch to try to level it out a bit.

 

let me know if you have any ideas.

 

much appreciated!

 

Alan

Posted

one idea....

 

Ask him if he only hear's it when backing up and turning. If so, he may need to trim the corner edge of the plastic air dam in front of his 295's.

 

DEWFPO

Posted
one idea....

 

Ask him if he only hear's it when backing up and turning.  If so, he may need to trim the corner edge of the plastic air dam in front of his 295's.

 

DEWFPO

 

 

 

 

Yea, already thought of that. He said that's not the case, that he is not rubbing. He is taking it to the dealer as we speak and leaving it with them. I just know dealers nowadays, and the chance of them actually finding anything wrong is practically zero...so I thought I would give you guys a shot.

 

I did just speak with him while driving and he said the dealer said something about a "load motor" possibly being bad? Would that make sense? I do not speak Chevy language as I have an 06' F350, but you guys seem to be alright :banghead:

Archived

This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts
  • Member Statistics

    342,840
    Total Members
    8,960
    Most Online
    appletrav
    Newest Member
    appletrav
    Joined
  • Who's Online   0 Members, 1 Anonymous, 450 Guests (See full list)

    • There are no registered users currently online
  • Latest Articles

  • Posts

    • This is a 1/2 ton thing ONLY.  All HDs 2020-2026 have the two speed transfer case, with Autotrac as an option.     1/2 tons 2019-2026, regular 4x4s come with a single speed case (no 4LO!), and trucks with Z71 ordered, or all Trail Boss trucks come with the 2 speed case.  2 speed case is also an option on WT, and is also standard on High Country.  
    • 2013 5.3 still to this day calls for the PF48 filter.  Which as a 15psi bypass pressure.     There is a TSB, 17-NA-157 that talks about the PF-63 and PF-64 filters which have a higher bypass rating of 22psi.    TSB HERE - temp.xml   "Beginning in 2012, the oil pumps began to regulate main gallery feedback instead of pump out pressure. This means that the oil pump now does not begin to regulate until pressure is built up to the main gallery. This change reduces the amount of time it takes to provide oil to the engine bearing and lifters during extreme cold start conditions.  Main gallery feedback oil pump control systems are present on the following engine families which use Spin-on oil filters: Small Gas Engine (SGE), Large Gas Engine (LGE), High Feature (HFV6) Gen2 and Small Block Gen5 gasoline engines. These engines with the main gallery feedback oil pump control systems are factory built with an ACDelco® oil filters"   It also calls out what engines use those filters.  The gen 4 small blocks were not on that list (LMG, LC9, L9H, L92, L94, L20, L96).  Gen 5 small blocks use the higher pressure filter.          That all said...   Your 7045 Napa filter is the PF63 equivalent, with 22psi bypass.  You are already using the higher bypass pressure filter.  You CAN keep using it, you don't technically have to use it though.  
    • Do you know WHY the filter relief setting was increased to 22 psig?    When the new system goes into the second stage the pump volume ramps up considerably. It was found that the 15 psi filter bypass setting put the filter in bypass on a warm engine when the second stage was activated. Raising the filter bypass setting forced the filter to do what it designed to do. Filter. Preventing debris from circulating during high load, high rpm operation.    So next question is how did GM find this out? VLOM/lifter failures and a deep dive by Melling Corp.    Last question. Is it required? Look at it like this; a motor may be equipped with a rev limiter. But it only works if the set point in reached. That 22 psig setting only matters if the pressure differential across the filter media exceeds 15 psig during normal warm operation. Second stage kicks in around 3000-3500 rpm.    I can't answer your question because I don't know you and how you use the truck. But I think there is enough information here to let you decide for yourself. 😉
    • Probably not their first rodeo, so it should go as planned most likely.  Typically the service manager or tech doing the swap will put some seat time to shake it down after they get it all put back together.  We usually put 50-100mi before we hand them back so if something happens, its not after you get it.  A coolant leaks, oil leaks, a ground left off or loose, vibration, etc.     The new engines so far have been good?  There's been a couple that have popped out there again (the replacement engine) but most have been okay.  
  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...