2500 Rear Leaf Spring Pack Differences

[Epsilon Plus]

Perhaps @newdude can shed some light on the differences in rate between the (3) leaf spring packs shown in online GM parts catalogs.

 

Referencing a 2022 2500 HD, we have

 

87838965 Code 8am/9am (the ones I have listed in my RPO codes for my gas 4x4 crew)

 

87838966 Code 8an/9an

 

87838967 Code 8ap/9ap

 

I can't find any info on which one is listed at which rate. Interestingly enough, General Spring sells three different spring packs marketed as OE replacements that are 2700#, 3400#, and 4500#. I wonder if these correspond? I also have a suspicion that the lightest rated pack is going to be the Cognito Comfort Ride pack just bought from GM and marked up 100%

 

 

Any thoughts? 

 

Thanks.

Edited June 6, 2025 by Epsilon Plus

[revrnd]

23 hours ago, Epsilon Plus said:

 

Referencing a 2022 2500 HD, we have

 

87838965 Code 8am/9am (the ones I have listed in my RPO codes for my gas 4x4 crew)

Same RPOs on my 2024 gasser.

Edited June 7, 2025 by revrnd

[kylant]

i am pretty sure the Cognito comfort ride leafs are made by Deaver and are not OEM

[Pryme]

On 6/6/2025 at 10:30 AM, Epsilon Plus said:

Perhaps @newdude can shed some light on the differences in rate between the (3) leaf spring packs shown in online GM parts catalogs.

 

Referencing a 2022 2500 HD, we have

 

87838965 Code 8am/9am (the ones I have listed in my RPO codes for my gas 4x4 crew)

 

87838966 Code 8an/9an

 

87838967 Code 8ap/9ap

 

I can't find any info on which one is listed at which rate. Interestingly enough, General Spring sells three different spring packs marketed as OE replacements that are 2700#, 3400#, and 4500#. I wonder if these correspond? I also have a suspicion that the lightest rated pack is going to be the Cognito Comfort Ride pack just bought from GM and marked up 100%

 

 

Any thoughts? 

 

Thanks.

Was just searching the springs they just installed in my truck due to the creaking rear suspension and this thread came up because they are the 965’s 

 

I did notice the new springs have some chipping of the paint on the leaves. Hopefully that’s not cause for concern. 

Edited August 8, 2025 by Pryme