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leadfoot33

By leadfoot33
in Ask A GM Technician

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leadfoot33 Enthusiast

leadfoot33

Posted
Posted

hello everyone. i recently picked up a 2002 gmc sierra 1500 z71 5.3l it is a beautiful truck and runs great but i have a question just before it shifts into 3rd gear it seems like it does a surge of power then shift and even then the shift seems almost slow and has excessive amounts of rev in between like i would say by about 200 rpm or somthing in that area. it only does it when your applying the throttle a little harder and running the motor to shift around 3000 or when its wide open its more noticeable. does it in to/haul mode does not seem to matter. i recently did the tune up (plugs wires) i also went and cleaned the mass air flow sensor and the tps sensosr along with the sensor above th tps it seems way better but still there. how do you test the tps sensor for the proper voltage it should be like .4v to 5v isnt it? . sorry for the long post.

rodram Enthusiast

rodram

Posted
Posted

You did not say which transmission you have ... if it is a 4-sp then you likely have the 4L60E.

... these slow shifts are likely an indication of transmission wear

... take it to a transmission shop or a mechanic that you trust for an opinion

... it is possible that you might get some more life out of it if the mechanic suggests changing shift solenoids, but this is likely only a short term fix

... how many miles on this transmission.... the 4L60E's often need rebuild attention somewhere around 120,000 to 140,000 miles, depending on how hard they have had to work during their lifetime.... and you just got it so, you likely do not know how it was driven or taken care of over the past 7 or 8 years.

 

Mine needed a total transmission and torque converter rebuild this past summer... and now it works great.

leadfoot33 Enthusiast

leadfoot33

Posted
  • Author
Posted

sorry truck has a 4l60e like you said. the truck has 147000 kms on it so i think thats 90000miles. i took it to the tranny guy today had the scanner hooked up. all the electronics are working correctly he believes that the check ball in the valve body wore a funny hole or somthing like that. it goes in next week for the valve body to be checked and fixed for around $300. how much was a total rebuild just so i know? anything else i should keep an eye on? also i get a low grown when i turn right i am low on power steering fluid. and i did hit some muddy trails just before it started happening( had to dump some leaves) :lol:

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted
sorry truck has a 4l60e like you said. the truck has 147000 kms on it so i think thats 90000miles. i took it to the tranny guy today had the scanner hooked up. all the electronics are working correctly he believes that the check ball in the valve body wore a funny hole or somthing like that. it goes in next week for the valve body to be checked and fixed for around $300. how much was a total rebuild just so i know? anything else i should keep an eye on? also i get a low grown when i turn right i am low on power steering fluid. and i did hit some muddy trails just before it started happening( had to dump some leaves) :lol:

 

 

please do not get the valve body done ,you have a worn out 3-4 clutch and you are wasting your money,the valve body spacer plate will get replaced during the rebuild,if it needs it ,you can buy a GM rebuild for more money and has a nice 3 yrs warranty for $2400 CDN plus labour(est of course) if your gonna keep the truck ,do it ,rebuilds work but have a 1 yr warranty ,dealers have a dedicated tranny guy and is an EXPERT on these trannies 'cause that is what they do all day every day,

 

what happens is you take your trk in and say ,"I need an estimate for rebuilding my tranny" ,it then gets removed and torn to bits and the tech gets a parts list together and presents that to the advisor and calls you,you can then ask what a SRTA costs installed as a comparison, SRTA (service replacement transmission assembly)

 

 

the above is what happens in a warranty situation every time

 

you can look at both estimates and make an informed decision.

 

and with every tranny job the the cooler gets flushed and flow checked for warranty purposes for you and the dealer .

 

this is what I did for many years and I hope it helps

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