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02' Tranny Question

snkbitten6

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snkbitten6 Enthusiast

snkbitten6

Posted
Posted

So bought this truck from my dad, the truck at about 50k blew the transmition, ended up in a recall... well rebuilt, at 80k blown tranny again, dealer fixed the recall with the recalled parts.... SO at 80k its fixed, truck now has 180k on it, this time it did nothing like it did the times when I was with my dad when it blew, it blew out pulling up a hill both time, and both times it was fine in drive, just no reverse... BUT, Maintained perfect and fluids are perfect... Driving home today from class go from a stop light very light, gets to the top of 1st, acts like its a stick car and the clutch is slipping and truck revs up "it's an auto truck." Come up to the next red light come to a stop. Check engine light comes on... I look at oil pressure thinking something went wrong. Guages look good besides check engine, take off soft again, no power, was in 2nd gear it felt like off the line, just bogged. drove it home got it up to about 45 to 50 never shifted..... Well parked it, just took it out, put it in 1st,2nd,3rd, manually, worked perfect, back in drive, went to pull out of my street, no power felt like it was slipping again, and then caught and drove fine, till 3rd, it slipped again, then shifted.... Well then drove it back after turning about it drove fine for 1-2nd then did it again.... So it has done it in all the gears, and reverse is perfectly fine btw.... So question, whats going on, i know nothing about chevy transmitions... Is this thing fried? if it is junk yard pull? or rebuilt it heavier? its my Daily driver, and car/boat hauler, Thanks in advance guys! Dan.

Nytemare Senior Enthusiast

Nytemare

Posted
Posted

First off....what year, make and model is your truck?

What engine ( this will tell us what trans you have)

 

 

If its an older truck...to me it sounds like a sticking modulator valve...but that's old school.

 

Could be your pump, could be a lot of things.

snkbitten6 Enthusiast

snkbitten6

Posted
  • Author
Posted
First off....what year, make and model is your truck?

What engine ( this will tell us what trans you have)

 

 

If its an older truck...to me it sounds like a sticking modulator valve...but that's old school.

 

Could be your pump, could be a lot of things.

Sorry, it's an 02' silverado extended cab, 1500 with the 5.3 in it

Nytemare Senior Enthusiast

Nytemare

Posted
Posted

Ok so you have a 4L60E trans.

 

Some simple things to try...check the fluid...for color...smell and amount...it could just have a leak, and the trans is low.

 

you have to have the truck running and in park to check it. Run it through the gears holding in each gear for about 5-10 secs with your foot on the brake, put it in park and check the level.

 

If its brownish in color its burnt....and your trans is probably toast...also if it smells burnt...same deal.

 

 

If everything checks out fine there, you probably have a bad sequencing valve. It shifts fine when you shift it your self...but not on its own.

Or your bands are done. The best bet if everything checks out with the fluid...Bring it to a good trans shop and have those guys take it for a drive. They will tell you in a heartbeat what needs to be done.

snkbitten6 Enthusiast

snkbitten6

Posted
  • Author
Posted
Ok so you have a 4L60E trans.

 

Some simple things to try...check the fluid...for color...smell and amount...it could just have a leak, and the trans is low.

 

you have to have the truck running and in park to check it. Run it through the gears holding in each gear for about 5-10 secs with your foot on the brake, put it in park and check the level.

 

If its brownish in color its burnt....and your trans is probably toast...also if it smells burnt...same deal.

 

 

If everything checks out fine there, you probably have a bad sequencing valve. It shifts fine when you shift it your self...but not on its own.

Or your bands are done. The best bet if everything checks out with the fluid...Bring it to a good trans shop and have those guys take it for a drive. They will tell you in a heartbeat what needs to be done.

 

 

So levels are all pefect, color is perfect.... Start it up this morning, check engine light is still on, drive it to class thinking i can't hurt it any more, it drives ok, but still a little stumbling on itself. but its fine, get to class, leave it for an hour and a half, come back start it up check engine light is off, drives perfect all the way home, shifts perfect.........

 

 

Soooo whats the deal?! should i put some kind of additive in it or something of the sort?!

 

Thanks!

rodram Enthusiast

rodram

Posted
Posted

like Nytemare says ... it needs to go to a good transmission shop for diagnosis ....

 

.. but, because it is a 4L60E and the age of it...... count on it needing a total transmission and torque converter rebuild.... anything less will just be a temporary band-aid at best

 

.. don't bother with any additive ... if you are going to keep the truck then just get the transmission fixed

minibike132 Senior Enthusiast

minibike132

Posted
Posted

Scan it and get the code. It may not be the trans at all, a plugged converter will feel alot like this sounds. In either case the code can tell us alot.

snkbitten6 Enthusiast

snkbitten6

Posted
  • Author
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Scan it and get the code. It may not be the trans at all, a plugged converter will feel alot like this sounds. In either case the code can tell us alot.

 

 

problem is now, is that it is not throwing a code, check engine light is now gone?! I don't know if thats a good thing or a bad thing.... Ive been around cars alot, and messed around with some pretty high performance cars and never seen this happen. Check engine light come on, drives like crap, won't shift, then next day perfect, no check engine... possible the computer just freaked out!?

jrod332 Enthusiast

jrod332

Posted
Posted

regardless if the light is on or off the code will stay in there until its cleared. It should still be there. If you dont have a scanner then just go to autozone they can do it for free and fast.

snkbitten6 Enthusiast

snkbitten6

Posted
  • Author
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regardless if the light is on or off the code will stay in there until its cleared. It should still be there. If you dont have a scanner then just go to autozone they can do it for free and fast.

Cool, I didn't know if it would still be there without the check engine light on... thanks for the help!

alwcurlz Enthusiast

alwcurlz

Posted
Posted

I've heard that the TPS (Throttle Position Sensor) can go bad and cause these issues as well. If the PCM does not get correct throttle input readings it will be confused as what to tell the transmission to do.

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