ACDelco Gold 335-1086 (88877296) Alternator

Really nice looking alternator, very simple install. functional & good voltage power, worth the value. Kepps battery charged very well. Fits perfect on any Chevy with a 105amp alternator. ----2003 Silverado 1500 4x4, 5.3 LS---- 1 - Pop open beer... 2- remove air filter 3- loosen the belt ( belt tensioner ) ( 15mm ) 4- remove the 2 screws through the front ( 15mm ) 5- might need to use crowbar to lift out old alternator / put in new one 6- unplug the 2 plugs in back 7- replace with new alternator ( might need some massaging to put in ) 8- do step 6 -through 1 to finish install

Like others mentioned, this new alternator does NOT have the raised “Delco” casting. It’s just how things are anymore. Most everything I buy, minus belts, seem to be made wherever anymore. So I don’t know how you guarantee build quality. Having said all that…here’s what I know. Local part houses have house brand reman alternators for $40-110 MORE than this NEW alternator. No core charge online. Local parts ranged in country of origin vary too….even within the same brand! So I bet on new AC Delco. Figure it’s a crap shoot so why not save some cash on a “traditionally solid” brand instead of reman house brand. Worked right away. No noises, 14.4 volts. I am satisfied with this purchase. No comment on longevity…my 2003 Suburban 5.3 got 201,000 out of the original Delco!!! I love my truck. If this gives me trouble I’ll update my post. Just really don’t like house brand remanufacturing Hope this helps others out. I don’t see parts suppliers improving…so this is my logic for keeping my truck on the road.. Pics of new one, pics of old one. For perfectly. Never grind ears down. Tap the spacers towards the front of the truck once you pry old alt out. Then new alt slips in easy. Tightening the two bolts will bring spacers back tight against alt. It’s a great system! Chevy built great drivelines in 2000-2006.

Fit and worked perfectly. My old one was only outputting about 13.6v where the new one outputs 14.2v. My local NAPA wanted $170 for a REMAN and in the past I have had bad luck with REMAN's lasting less than a year and then they wanted over $300 for a NEW one. This may be more expensive then most of the other alternators here on Amazon for the 5.3 vortec but take it this way, its a OEM replacement part, its new, and it beats all auto parts stores prices. If your in a pinch for a alternator your better off getting a used one from a salvage yard or a pick n pull over the cheapest REMAN's, which are just cleaned up, sometimes spray painted, and the voltage regulator replaced with a cheap fragile one. Get NEW quality parts when you can! Not REMAN spray painted parts!

I bought this to replace mine (120,000 miles) which had developed an intermittent whining noise from the bearings. It arrived flopping around inside a beat up ACDelco box and the desiccant packet they included to absorb moisture had ruptured so the desiccant beads had found their way into the alternator. I had to shake it all around to get all the silica gel beads to come out of the unit. You'd think they could solidly pack it into the box so that it doesn't roll around and tear up the cardboard and explode the desiccant. Otherwise, I had no issues with installation or startup. It appears to be functioning normally and you can't beat the price for a brand new OEM part, which cost less than half of the rebuilt version at the local parts stores. EDIT: Voltage regulator flaked out quickly during warranty. The lights are flickering and I just didn't realize the alternator was causing this. I blamed a loose ground, and when I finally figured it out it was the alternator, it was out of warranty.

Straight drop in for my 2005 Duramax diesel. Immediately was charging at 14.4 volts. Keep in mind there are bushings that the mounting bolts go through and they will most likely need to be pushed back out to make room for the new alternator to drop right in. If you go to drop in your new alternator and it appears too tight or won't fit in - DO NOT HAMMER IT OR FILE DOWN THE ALTERNATOR... just make a little press. Take a look at my pictures above, I just used a long spare bolt & nut and found a socket large enough to fit over the outside of the bushing but small enough to rest on the mounting cradle. I then pushed the bolt though the socket and attached the nut on the other end (see pics). I then took an open ended wrench on each end and tightened the bolt until the bushing moved forward and was flush with the mounting cradle. There are only two bushings and they are both up front. After this the alternator dropped right in and I bolted it up. When you tighten the bolts on the new alternator, the bushings will move forward and fit snug on the new alternator making a tight and aligned fit. I hope this helps!

Good value for the money! I called around my local auto parts stores and they want $450 for the same exact part and it was remanufactured. This one is brand new. So it was a no-brainer to buy this instead of getting one from a local auto parts store and paying three times the price for it! Installation was very easy. You have to pry the original one out of the bracket with a small crowbar and then knock those bushings at the front of the bracket as far forward as you can so that the new one drops in easily or you will have one hell of a time getting it in there. It takes a few seconds to do that versus who knows how long doing it the hard way. Seems to be charging properly. I’m getting 14.6 to 14.7 on my multimeter at the alternator now. My original one lasted 162,750 miles but it was not charging properly and was looking like it was getting burned up. So it was time to put a new one on. Mine was the 105 A and that’s exactly what this replacement one is. When it comes to electrical parts I will not consider anything else other than AC/Delco parts for my GM truck. This went on my 2003 Silverado Z71 extended cab that I have owned since it was brand new. I will see how well it does over time and if I need to will update later.

For the price, you really can't beat this. I bought this for my '03 Chevy Silverado 2500HD w/ 6L (LQ4), which it fit as expected. Removal/install took me about 15 minutes, not including replacing the pulley (see below). Pros: Seems well built. Brand new-not a poorly re-manufactured unit like most other units at and above this price. Easily installed on the LQ4's accessory drive. Cons: Pulley was damaged upon arrival (one of the ridges was nicked, and unfortunately there was a slight bulge into one of the grooves, which would likely damage the serpentine belt) . Not wanting to go several more days without a working alternator, I decided to swap the pulley from my old alternator onto this unit instead of returning it. Given the price, I really can't complain too much on this issue. Alternator is assembled in Mexico. That's better than Made in China, but made in USA is always preferred if possible! Other thoughts: For those of you replacing one of these on the GM 6.0L truck engine, the following may prove helpful: You will likely need to pry the old one out. Just stick a prybar under the old alternator and pry it upward. (after removing the serpentine belt, of course!) Once you've worked it out, I found that it's easier to get the new one in if you take a hammer and gently work the little sleeves in the front holes of the mount towards the front of the truck (you just need a millimeter or so of movement. They'll snug back up to their original position when you install the new alternator). If you don't push these forward, the new alternator can be very hard to reinstall. (Of course, I'm not responsible if you break the mount or damage anything else while doing this!) Hopefully this helps someone.

So far, so goid. Truck runs great again

Perfect fit, worked right off thje bat ...longevity unknown.

As expected from ACDelco, this is a well made unit that fit exactly as a GMC replacement part. The wiring receptacle / connector was also an exact fit that meant it only had to be plugged into this new unit. The issue during removal of the original unit was that the two long bolts that hold the alternator in place had corroded on the far end hidden tips and they did not want to pull through the body of the alternator / engine mount. Spinning those bolts with a air gun for a minute removed the crud that was blocking their removal and they came out then with only using my fingers. As the engine mount tends to be very tight, it took some effort to spread its arms and slide and tap the alternator fully into place. Don't file it down as is suggested on websites. There were not any issues relating to the manufacture or sizing of the replacement alternator. I recommend this alternator.

works great, 3 years old still good

2001 Silverado, 5.3L. Fits perfect, quiet, and puts out 14.5 Volts. Driven with it about 200 miles, works like the original did. Good buy! 5/28/2023 - Update - Well I though the alternator was great, seems about a week ago whenever using signals, windows, brakes, almost any electical accessory, my voltmeter now bounces up and down in my guage cluster. I have load tested the battery, and checked voltage, which is bouncing up and down a few volts. I have check all grounds and bulbs, which are all good. Never had this with any other alternator. HMMMM maybe I should have bought at the local parts store, then I could get an exchange. Not even 6 months old.....not to impressed!

Works as new not reman alternater should Good value