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Discussion Starter #1
found on GM site HD trucks,


Reduced front 8.25 4WD axle lube levels from 1600 mL to 1430 mL (testing has verified reduction will not affect performance)
 

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if my math is correct, they went from 1.69 US quarts to 1.51 US quarts....seems I put 2 full quarts in mine. Wonder if that is bad?
 

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GM doesn't put the 8.25" IFS on HD trucks so how is that possible? Am I missing something here? BTW GM puts the AAM 9.25" front axle on all HD trucks.
 

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I just changed mine. 2 full qts.
 

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Mine took just a hair over 2 quarts...... I thought it was on level ground... I guess i will check it... thanks
 

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Discussion Starter #6
I wasn't sure what size front we have but this spec is listed under all the pick up trucks even the 3500 ?


How about this change,


Reduce diameter of propshaft from 5.75" to 5.00" on K25/35 with M74 transmission.
 

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I've always added fluid until it started coming out of the inlet hole. Once it stopped seeping out then I put the plug back in and was good to go.
 

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JimWilson said:
I've always added fluid until it started coming out of the inlet hole. Once it stopped seeping out then I put the plug back in and was good to go.




This is what I did, and it held 2 full quarts.
 
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