Will it work and fit alternator upgrade

[Sloverado]

I have a 150a (84143544) alternator I believe on my 17 6.2. I’m wanting to upgrade to the 17 Silverado 2500 snow prep 220a (84143539) one. My dealer can’t help me as there picture don’t show any different. Yes I can get an aftermarket one for 130 more than I can buy an oem one but don’t need that large of one. Let me know your findings

[Sloverado]

Other than one being a late case and other being a small case I think they are the same

[green02crew]

Did you ever try this?


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[davester]

I know for my truck, I upgraded from a 105A to 145A alternator, it just bolted & plugged right in, but I also needed a new belt, as the 145A alternator pulley was slightly larger.  However, the 145A alternator was also for the 6.0L engine.

 

From looking at rockauto, only the 1500 has the 6.2, with 150A or 170A alternators, with the 2500 getting the 6.0 w 150A or 220A alternators, and the alternators have different part numbers for the same size alternator.  I expect you'll find the alternators are slightly different in some way, and you'll need to figure out what's different on your own.  For example, it could be one or more of: offset of pulley from mount, electrical connector, how the alternator is controlled (as I know my alternator output is controlled by one of the computers, likely the same for yours), pulley diameter or width, or something else.

[green02crew]

I know for my truck, I upgraded from a 105A to 145A alternator, it just bolted & plugged right in, but I also needed a new belt, as the 145A alternator pulley was slightly larger.  However, the 145A alternator was also for the 6.0L engine.
 
From looking at rockauto, only the 1500 has the 6.2, with 150A or 170A alternators, with the 2500 getting the 6.0 w 150A or 220A alternators, and the alternators have different part numbers for the same size alternator.  I expect you'll find the alternators are slightly different in some way, and you'll need to figure out what's different on your own.  For example, it could be one or more of: offset of pulley from mount, electrical connector, how the alternator is controlled (as I know my alternator output is controlled by one of the computers, likely the same for yours), pulley diameter or width, or something else.

I have a 2018 6.2 so I’m assuming from what you said I likely already have a higher output alternator.


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[davester]

7 hours ago, green02crew said:

I have a 2018 6.2 so I’m assuming from what you said I likely already have a higher output alternator.

 

From what I saw on rockauto, you could have either the 150A or 170A alternator.  You should be able to figure out which you have from the rpo codes/build sheet for your truck, or possibly the part number on the alternator if you can see it.