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Transmission Problems On 4l60e Equipped GMC Truck

Mike Diaz
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zxcv Enthusiast

zxcv

Posted
Posted

Doesn't "Tow/Haul" mode disable OD? Wouldn't it be smart to use that for towing?

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Mike Diaz
Mike Diaz

I've been in the repair business for the past 7 years, including almost 3 years as manager at a specialty transmission repair facility. I thought I would share a few of my experiences with the GM dri

mike.nelson007@yahoo.com
[email protected]

Well this vendor that didn't radius the splines forgot to do it as far back as 1995/1996 on 4l65e's too. It sounds like to me this sun shell problem has been going on in GM's for nearly 20 years!!!!

Willshire
Willshire

i read many posts on this site that say 175-200 is norm op temp 260 is danger zone. external trans cooler if you need to cool it down. better and less expensive than bigger rad.

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dlstewart01 Senior Enthusiast

dlstewart01

Posted
Posted
Doesn't "Tow/Haul" mode disable OD? Wouldn't it be smart to use that for towing?

 

 

No I don't believe it does, it just goes into over drive at a higher RPM.

 

Don

dlstewart01 Senior Enthusiast

dlstewart01

Posted
Posted
I was talking to my local tranny shop about tranny temps when towing, noting that mine climbs to about 195-205 degrees when going up hill, and then leveling out about 186 during steady towing, and he told me that was acceptable. I then asked about synthetic oil in the tranny and would it help. He told me that he has not been sold on the synthetic oil as he has not seen enough evidence where it should be switched from dino oil. He also recommended a oil change yearly in the tranny if towing on a regular basis. I think that when I do take it in, I will most likely switch to Mobil syn oil in there. Any thoughts?

 

you already have synthetic in your tranny.

 

I do? Sweet. Not to be rude, but how can I confirm that? How do I know for a fact that it is Syn oil in there (other then tasting it)?

 

And what style of tranny cooler would come in the GMT900?

 

Thanks.

 

 

Starting in 2006 GM went to Dextron V1 which is a simi synthetic and backwards compatable for older transmissions.

 

Don

dlstewart01 Senior Enthusiast

dlstewart01

Posted
Posted (edited)
Don, how fast is your truck??

 

 

That would be hard to say. I have never timed it, but I will say it seems to be faster than the average 5.3. Ive had a couple of people kick it to the floor when I was passing them. I passed them any way. Who knows???

 

Don

Edited by dlstewart01
Mikeee Enthusiast

Mikeee

Posted
Posted
Welcome Mike !

 

Where ya been ???

We've been waitin' years for a trans guy.

 

Now we need a:

motor guy

A/C guy

'puter guy

steering wheel guy

front end guy

brakes guy

rear end guy

tires guy

electrical guy

truck wash guy

body guy

paint guy

fuel system guy

 

Who else do we not have?

 

 

 

 

uhhhhh a BEER GUY!!! :uhoh::D:D:D:crazy:

 

 

pizza and wings guy

 

 

I'll be the "awesome" guy. :lol:

 

 

 

 

Awesome topic man! It's really nice to have someone post valuable information for a change....unlike some other "6 wrench" members. :D Ahahah Just joking!

 

But seriously, good topic!

 

Unless you are in San Fransisco, I don't think we are "looking" for that "kind" of guy.

compulynx Enthusiast

compulynx

Posted
Posted
Ok, one more question.

 

In reference to the "Tow in 3 or D" question, you stated to run up speed enough for converter lockup. That I understand, but will the coverter lock up in 3 also, or only in D.

 

C

 

 

My question never got an answer.... :lol:

Mike Diaz Enthusiast

Mike Diaz

Posted
  • Author
Posted
Ok, one more question.

 

In reference to the "Tow in 3 or D" question, you stated to run up speed enough for converter lockup. That I understand, but will the coverter lock up in 3 also, or only in D.

 

C

 

Sorry for not getting to this question earlier. I would have to connect the scanner to your truck and find out if the torque converter clutch solenoid is activating in 3rd gear. You might be able to watch to see if there's an RPM drop at partial throttle, but that might be hard to detect. I tried to look it up on alldatapro and I'm not finding any good info.

Mike Diaz Enthusiast

Mike Diaz

Posted
  • Author
Posted
About 4600 pounds all over the country.

 

That's not too bad, I haul 5500 pounds about 120 miles every saturday night for stock car racing.

Tucson_02Silverado Senior Enthusiast

Tucson_02Silverado

Posted
Posted (edited)

I've had 2 failures, one at 34K and again at 80K. Both times was the Sun Shell busting apart. Both times on a 1-2 shift, one on a freeway on-ramp, second pulling out of a shopping mall. Neither time was I towing. Both times, there was a stall in forward movement then a "slam" shift into 2nd, with resulting no 2,4,R. The first repair was under warranty by dealer. The second repair I had a non-dealer repair shop use the Beast Sun Shell and the 3-4 clutch pack changed to Alto.

 

I do have a Wester's 91 Hot tune with the majority of TQM removed during both instances.

Edited by Tucson_02Silverado
wlvrn1215 Senior Enthusiast

wlvrn1215

Posted
Posted

they must have beefed them up or something cause my 07 has TM removed , a vette servo and if your WOT and the conditions are right it'll bark the tires from 1st-2nd. Now I don't drive like a maniac but its nice to know the power is there when I need it :lol:

Mike Diaz Enthusiast

Mike Diaz

Posted
  • Author
Posted
I've had 2 failures, one at 34K and again at 80K. Both times was the Sun Shell busting apart. Both times on a 1-2 shift, one on a freeway on-ramp, second pulling out of a shopping mall. Neither time was I towing. Both times, there was a stall in forward movement then a "slam" shift into 2nd, with resulting no 2,4,R. The first repair was under warranty by dealer. The second repair I had a non-dealer repair shop use the Beast Sun Shell and the 3-4 clutch pack changed to Alto.

 

I do have a Wester's 91 Hot tune with the majority of TQM removed during both instances.

 

I don't remember how much the Beast sun shell was, like $80? Probably well worth it. How's it been since the new shell and 3-4 clutch pack?

neto1978 Enthusiast

neto1978

Posted
Posted

Mike ,what about the NBS 4L60E 2-1 downshifiting bump ,when stopping at the light?

I had that problem in my 2007 ,but my 2008 is perfect...

 

BTW my name's Luiz Diaz...

VMax2007 Senior Enthusiast

VMax2007

Posted
Posted
Jeff can be the rear end guy :thumbs::lol::D:crackup:

 

Thanks for asking, but I think I'll decline. Maybe you should ask daddy? Or maybe try the gay internet sites? Good luck in your search. :D

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