Acdelco 335-1086 Professional Alternator

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

OEM Fit perfect and I'm sure it works perfect, haven't run the truck yet it's still in the barn

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.

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.

What can I say? This oem part replaced the original alternator that finally burned up after 250K miles. It works great!