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2005 gmc envoy_slt
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95 Posts
Discussion Starter · #1 ·
Hey guys, quick couple questions. I have a 05 envoy w/65K miles. Planning on going on a trip here soon and I wanted to change the serpentine belt before I go. Parts store told me that the v6 has two different belts depending on which alternator you have. Without having to take off the belt, is there anyway of knowing which belt and alternator I have. I guess, my last question is....if I have the lower output alternator, will the higher output alternator fit in my envoy using the same mounting points....so if I wanted to upgrade it, would I have to buy any extra parts to get it too fit?
Last thing...I see a lot of threads talking about dimming headlights. Has anyone put a grounding kit on too see if it works...it did work in my 03 Nissan...it was having the same problem. I have the dimming issue in my Envoy but I haven't tried the grouding kit...and it's never really given me problems. Just a thought....Thanks

:confused:
 

· Banned
2004 gmc
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26,436 Posts
If the parts store also thinks you have a V6, they're totally wrong instead of only being half wrong. :D

Seriously, we have an I6. AFAIK, all vehicles have the 150A alternator, and the only belt difference is that the belt for the EXT/XL long wheelbase version has a shorter belt due to a difference in the power steering pump.

Gatorback belts are recommended, and the part number you need is 4060915. Part # 4060905 is the shorter belt used on the EXT and XL vehicles.

Feel free to argue with the parts folks if they claim their data base has different info. Many of the parts chains DO have bad data in their computers for this particular part. Trailvoy knows better. :tiphat
 

· Registered
2009 chevy
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6,513 Posts
The roadie is completely correct on this subject :thumbsup:.

I just bought a belt for an 05 Envoy XL (long wheel base). The Canadian data bases are the same (probably all sourced for the same supplier). They claim the difference is alternator based. WRONG. It is wheel base length dependent.
The lwb trucks use the short belt, the swb trucks use the long belt. Go figure :undecided
 

· Registered
2005 gmc envoy_slt
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95 Posts
Discussion Starter · #4 ·
Sweetness...I'll go down tommorrow and get the belt...Gatorback huh?? Roadie...ya that was me saying V6...still not used to have to say I6...sounds awkward. I'm curious about the the other alternator they were talking about...i'll ask what the difference between the two just out of curiousity. Thanks
 

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2004 gmc
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26,436 Posts
There's an RPO code for 145 Amp alternators, and 150 Amp. I've never heard of a 145 Amp version being installed. For that small a difference, they shouldn't have even bothered to design it into the logistics chain. With all the electronic control modules, it IS a heavy power-using vehicle. And they still managed to allow the voltage to droop when things like the secondary air injector turbine spins up.
 

· Banned
2003 gmc envoy_slt
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8,149 Posts
I'm sure Roadie and RayVoy are correct, but if you want to check, the RPO code for the 150 amp alternator is KG4. The 130 amp is KG3.
 

· Banned
2004 gmc
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26,436 Posts
I'm sure Roadie and RayVoy are correct, but if you want to check, the RPO code for the 150 amp alternator is KG4. The 130 amp is KG3.
Hmmmmm, in 2003-2004, KG3 referred to a 145 Amp option. There was no option other than KG4 in the RPO codes for 2002 (At least the ones on this site.)

Is your 130 Amp a typo, or do you have another list that says it's 130 instead of 145? Yeah, I know it's irrelevant since I don't think any trailvoys shipped with smaller alternators, but debating the minutia is such a traditional pastime here. :yes:
 

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2003 gmc envoy_slt
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8,149 Posts
You are correct sir. I just checked my service manual and KG3=145 amp. The 130 amp was from a posting on TV, that I had written on a list I keep for gen info. That's what happens when I don't verify. I will change the list. :eek:fftopic: Why the h**l would they waste the money on a 5 amp difference?
 

· Western Canada Chapter
2003
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6,421 Posts
So I got my belt the other day from my local parts store. The guy across the street comes over to give me a hand because I can't get the tensioner out of the way and remove the belt at the same time.

I take the old belt and the new belt and stretch them out between my arms hooked on my thumbs and I think ... ok close enough. Well I got it on but is was soooooo tight.

So masterminds and gurus ...... do I leave it or spend more money and buy the right one? It seems to work fine but will the extra tension blow out the idler and or tensioner pulleys?

Where was this thread at 10 am yesterday :duh:
 

· Registered
2004 gmc envoy_sle
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399 Posts
Hmmmmm, in 2003-2004, KG3 referred to a 145 Amp option. There was no option other than KG4 in the RPO codes for 2002 (At least the ones on this site.)

Is your 130 Amp a typo, or do you have another list that says it's 130 instead of 145? Yeah, I know it's irrelevant since I don't think any trailvoys shipped with smaller alternators, but debating the minutia is such a traditional pastime here. :yes:
Like you guys said, it's not a big deal, but I noticed on Napa's website, they list 130 and 150 when you're in the belts section. When you look for alternators, they only list the 150 and an optional 200 (nice upgrade). I did find on the web that the V8 trucks come with the KG3 (145 for 5.3 and 6.0). And that is probably b/c that motor is put into so many vehicles (tahoe, subs and silverado's) and uses that alternator.
 

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2004 gmc envoy_slt_xl
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1,393 Posts
So I got my belt the other day from my local parts store. The guy across the street comes over to give me a hand because I can't get the tensioner out of the way and remove the belt at the same time.

I take the old belt and the new belt and stretch them out between my arms hooked on my thumbs and I think ... ok close enough. Well I got it on but is was soooooo tight.

So masterminds and gurus ...... do I leave it or spend more money and buy the right one? It seems to work fine but will the extra tension blow out the idler and or tensioner pulleys?

Where was this thread at 10 am yesterday :duh:
Are any of the pulleys beings bent or strained? Is anything binding? Id say leave it on .. If it where too tight and or wrong, you would not have been able to get it on at all. It will loosen up slightly as it heats/ages. :m2:
 

· Registered
2005 chevy trailblazer_ls_ext
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2,671 Posts
If the parts store also thinks you have a V6, they're totally wrong instead of only being half wrong. :D

Seriously, we have an I6. AFAIK, all vehicles have the 150A alternator, and the only belt difference is that the belt for the EXT/XL long wheelbase version has a shorter belt due to a difference in the power steering pump.

Gatorback belts are recommended, and the part number you need is 4060915. Part # 4060905 is the shorter belt used on the EXT and XL vehicles.

Feel free to argue with the parts folks if they claim their data base has different info. Many of the parts chains DO have bad data in their computers for this particular part. Trailvoy knows better. :tiphat
Exactly. I did a lot of research on this. There is only one place that I have found that has the correct information. It is Dayco's web site:

http://www.mvreader.com/multiview/d...R&year=2005&year_from=&year_to=&engine=B2A&l=

If you have the EXT vehicle, you COULD use the longer belt (91.5") but your tensioner will be noisy and your belt may slip a little. Don't ask how I know this! :D

Frankly when I went to my local parts store, they asked which alternator I had and just to make life easier for all of us I told them "130 amp"
It wouldn't do any good for any of us to argue about it because:
a: Most of the employees could really care less and
b: There really isn't anything they can do about it anyhow.

Sometimes you have to choose your battles wisely!

So masterminds and gurus ...... do I leave it or spend more money and buy the right one? It seems to work fine but will the extra tension blow out the idler and or tensioner pulleys?

Where was this thread at 10 am yesterday :duh:
What is the part number of the belt you bought? I'm thinking you got the right one, it is tight just because it is a new belt!

BTW, I hate to be a stick in the mud, but this topic has been discussed several times already. Maybe we should make this (or one of the other ones) a sticky!
 

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2004 chevy trailblazer_ls_ext
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1,061 Posts
yeap i made the mistake in getting the longer belt and finding out the belt tensioner rattles to high hell with that belt. Kept the long belt and realized thats the exact belt for my grand prix and then bought the shorter belt. so it all worked out for me.
 

· Registered
2009 chevy
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6,513 Posts
For those of you that experienced a tight belt instal, and if you have the short wheel base trucks, you probably have the wrong belt.

There is only 1.5 or 2" difference in he belts.

I have the long wheel base truck, and I changed my belt 2 weeks ago. I used the small belt, and it installed very easily.

A belt that is too tight will cause a lot of strain on all/any of the bearings.

I would return the belt and tell the store they gave you the wrong belt, insist on a change.

BTW, the good news is that the longer belt is cheaper (about $15.00 in Canada).
 

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2004 chevy trailblazer_ls_ext
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1,061 Posts
just watch out on the belt exchange policy, i read somewhere (autozone) that if the belt is on it for 15 mins then its considered used and unreturnable.
 
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