transmission?

leadfoot33 · 11-05-2009, 11:37 PM

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. sorry for the long post. i am still learning about these new trucks give me my old 94 i can fix it lol this not as much :P

pearsont74 · 11-06-2009, 11:17 AM

sounds like a sensor on this one....cheap to replace instead of takin it to a tranny shop IMO
Im replacing my TPS on my 96 5.7 in hopes to resolve some of my odd behavor to...NAPA has it for $37 but im new on these too.

leadfoot33 · 11-06-2009, 01:17 PM

ya i was hearing that these things have like a servos in them or somtheing so i was wondering if that thign was actingf slow or somthing. lol

scavanger · 11-06-2009, 03:06 PM

Quote:

Originally Posted by pearsont74

sounds like a sensor on this one....cheap to replace instead of takin it to a tranny shop IMO
Im replacing my TPS on my 96 5.7 in hopes to resolve some of my odd behavor to...NAPA has it for $37 but im new on these too.

You can check the TPS with a volt meter.. think it is .5 volts with throttle closed and about 5 wide open.. Attach the meter and slowly open the throttle and watch the voltage, should be a smooth increase any sudden drops or increases replace it.
I base the voltages on my vette manual and on the voltage on my 95 GMC 5.7 if I am way off on the voltage someone jump in and correct me.

Scav.

bradrhale · 11-06-2009, 03:09 PM

http://www.truckforum.org/forums/gen...tml#post131055

how to test

leadfoot33 · 11-06-2009, 07:29 PM

so i took it to the tranny shop because in town they do free test drives. he thinks it might be alittle ball that falls into a hole in the tranny that causes it to shift or somthign like that. he thinks that the whole the ball falls into is oblonged or somthing. i go back in on monday for him to hook up the scanner at no charge. its just so weird lol

Crmzendrgone · 11-06-2009, 07:41 PM

I would think not for sure but by 2002 the computer does all the shifting with solenoids I dont think there are check balls any more but I could and probably am way wrong.

leadfoot33 · 11-06-2009, 07:50 PM

i appreciate the info. all the info is helpful for me lol

11-05-2009, 11:37 PM	#1
leadfoot33 Junior Member Join Date: Nov 2009 Posts: 4	transmission? 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. sorry for the long post. i am still learning about these new trucks give me my old 94 i can fix it lol this not as much :P

11-06-2009, 07:41 PM	#7
Crmzendrgone Senior Member Join Date: Apr 2009 Location: Arizona Posts: 1,420	I would think not for sure but by 2002 the computer does all the shifting with solenoids I dont think there are check balls any more but I could and probably am way wrong. __________________ ENGINES PRODUCE POWER. MOTORS RECEIVE POWER. https://lastroundbestround.com/Home_Page.html

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11-06-2009, 11:17 AM	#2
pearsont74 Full Member Join Date: Oct 2009 Location: St Pete, Fla Posts: 96	sounds like a sensor on this one....cheap to replace instead of takin it to a tranny shop IMO Im replacing my TPS on my 96 5.7 in hopes to resolve some of my odd behavor to...NAPA has it for $37 but im new on these too.

11-06-2009, 01:17 PM	#3
leadfoot33 Junior Member Join Date: Nov 2009 Posts: 4	ya i was hearing that these things have like a servos in them or somtheing so i was wondering if that thign was actingf slow or somthing. lol

11-06-2009, 03:09 PM	#5
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 8,024	http://www.truckforum.org/forums/gen...tml#post131055 how to test

11-06-2009, 07:29 PM	#6
leadfoot33 Junior Member Join Date: Nov 2009 Posts: 4	so i took it to the tranny shop because in town they do free test drives. he thinks it might be alittle ball that falls into a hole in the tranny that causes it to shift or somthign like that. he thinks that the whole the ball falls into is oblonged or somthing. i go back in on monday for him to hook up the scanner at no charge. its just so weird lol

11-06-2009, 07:50 PM	#8
leadfoot33 Junior Member Join Date: Nov 2009 Posts: 4	i appreciate the info. all the info is helpful for me lol