Jump to content

Transmission Overheating?

jro909

By jro909
in Ask A GM Technician

Recommended Posts

jro909 Senior Enthusiast

jro909

Posted
Posted

after i drive my 04 1500(z85) for long periods of time it almost feels like it revs for a long time in first then finally shifts, i'm not sure if its overheating or what? i drove today for a good hour and a half straight, stopped and took off again and it just reved with no power then finally went into 2nd and moved and ran fine...am i crazy?

Nytemare Senior Enthusiast

Nytemare

Posted
Posted

Flush the trans and replace the fluid with synthetic...it handles heat way better.

Smell the fluid, and see if it has a burnt smell to it....if your not sure what ATF is supposed to smell like go get a quart and sniff it.

 

And yes you are crazy...but that has nothing to do with your trans :P:cool::eek::lol::P

jro909 Senior Enthusiast

jro909

Posted
  • Author
Posted

its fairly new fluid, and no its not burnt..it has this thing too where the first inital shift frn 1st to 2nd when cold, where it gets ready to shift then just goes blank, if i roll into the throttle a little more it shifts and after that everythings kosher

Nytemare Senior Enthusiast

Nytemare

Posted
Posted

Sounds like a fully functioning stock tuned 4L60E to me.

 

As fluid heats up shifting takes longer...mine acted the same way until I switched to RP Synthetic, it improved by a lot...than I got it tuned...now its shifts are crisp.

rodram Enthusiast

rodram

Posted
Posted

... sounds like your 4L60E transmission is wearing out.... you are in good company... it has happening to many of us .... what's on your odometer ... my guess is somewhere between 100,000 and 140,000 miles

 

... take it to a good transmission shop... they may tell you some shift sensors are going bad... (that would be the good news...) or they may tell you your clutches or shift bands are worn out.... (then it's time for a total transmission and torque converter rebuild.)

 

... a performance tune won't help if the transmission is worn out

 

Good Luck

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted
... sounds like your 4L60E transmission is wearing out.... you are in good company... it has happening to many of us .... what's on your odometer ... my guess is somewhere between 100,000 and 140,000 miles

 

... take it to a good transmission shop... they may tell you some shift sensors are going bad... (that would be the good news...) or they may tell you your clutches or shift bands are worn out.... (then it's time for a total transmission and torque converter rebuild.)

 

... a performance tune won't help if the transmission is worn out

 

Good Luck

 

+1 ,is the engine light on by chance,.

 

transmissions should never rev up ,even electrical fault will be a higher gear on some ,but it won't slip.

 

changing oil does not make the clutches thicker and restore function,lol,though alot of peoplle think to do that ,right Rod?

Nytemare Senior Enthusiast

Nytemare

Posted
Posted
... sounds like your 4L60E transmission is wearing out.... you are in good company... it has happening to many of us .... what's on your odometer ... my guess is somewhere between 100,000 and 140,000 miles

 

... take it to a good transmission shop... they may tell you some shift sensors are going bad... (that would be the good news...) or they may tell you your clutches or shift bands are worn out.... (then it's time for a total transmission and torque converter rebuild.)

 

... a performance tune won't help if the transmission is worn out

 

Good Luck

 

+1 ,is the engine light on by chance,.

 

transmissions should never rev up ,even electrical fault will be a higher gear on some ,but it won't slip.

 

changing oil does not make the clutches thicker and restore function,lol,though alot of peoplle think to do that ,right Rod?

 

Depends on whats going on. If he means it takes longer to shift when its hot...That use to be my problem before I got a tune and switched to Synth. ATF.

If its just Reving...AKA slipping and not going anywhere...than yeah its done.

Taking a long time to shift to second is, from what I have read on various boards, normal operation of a Stock hot trans.

 

But I beat the piss out of my 4L60E...and its fine...I have 70K on my truck...and I don't exactly treat it nice all the time. Why would I baby a trans that I can replace with one that can handle 600ft-lbs of torque for 2500 bones.

zaac Enthusiast

zaac

Posted
Posted
it has this thing too where the first inital shift frn 1st to 2nd when cold, where it gets ready to shift then just goes blank, if i roll into the throttle a little more it shifts and after that everythings kosher

The reason for that is to warm up the engine faster and get the heater blowing warm air. It explains in the owner's manual.

jro909 Senior Enthusiast

jro909

Posted
  • Author
Posted

i have 98k on the clock, tranny has been well taken care of and babied, it only happens if i drive for very long periods of time, i average 30 miles one way a day to work and it shifts fine, yesterday i drive 60 miles with 600 pounds of concrete and after that is when it started, no lights and no codes..truck shifts like a dream most of the time, in the summer when driving alot and such in the heat is when it does it so i pinned it to the transmission fluid being thin like you guys said, i have dexron 3 in there or maybe 4..whatever the dealership put in when i got my transmission dropped last month for a new front seal, 3k miles before that or so i had the filter and pan dropped and new fluid was added then too so the fluid should be in good shape..pretty much all the fluid in the truck is new lol

Nytemare Senior Enthusiast

Nytemare

Posted
Posted
Nytemare, the trans you are talking about for 2500, do you have a manufacture and or part number? Will it fit a 5.3?

I'll do you one better...heres the website

 

http://www.transmissioncenter.net/4l60e.htm#Price%20Chart

 

Sorry though...to make it handle 600ft-lbs its 2800 bucks....it needs the raptor drive package that's 300 bones.

 

It will fit ls style engines....so yes 5.3 is included in that and you can tow up to 6000lbs in 4th gear with this trans.

Nytemare Senior Enthusiast

Nytemare

Posted
Posted
i have 98k on the clock, tranny has been well taken care of and babied, it only happens if i drive for very long periods of time, i average 30 miles one way a day to work and it shifts fine, yesterday i drive 60 miles with 600 pounds of concrete and after that is when it started, no lights and no codes..truck shifts like a dream most of the time, in the summer when driving alot and such in the heat is when it does it so i pinned it to the transmission fluid being thin like you guys said, i have dexron 3 in there or maybe 4..whatever the dealership put in when i got my transmission dropped last month for a new front seal, 3k miles before that or so i had the filter and pan dropped and new fluid was added then too so the fluid should be in good shape..pretty much all the fluid in the truck is new lol

Do you use the tow/haul button when you have loads in the bed, as well as when you tow? That's what its for you know.

jro909 Senior Enthusiast

jro909

Posted
  • Author
Posted

i do not use tow mode, as i do not hit the 75% weight mark and the tranny dosen't hunt so i don't use it

Archived

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

Go to topic listing

  • Latest Articles

  • Posts

    • newdude
      2 speed transfer case optional now?

      By newdude · Posted

      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.  
    • newdude
      Different requirements for oil filters?

      By newdude · Posted

      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.  
    • Grumpy Bear
      Different requirements for oil filters?

      By Grumpy Bear · Posted

      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. 😉
    • Coastie05
      give me some tips to make my truck look better

      By Coastie05 · Posted

      Go back to OEM wheels. 
    • newdude
      2020 Trailboss 6.2 replacement

      By newdude · Posted

      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...