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Discussion Starter · #1 ·
Well, I can't find the chart now but I bought the highest rate OEM front springs and finally got around to installing them.

Getting efficient at spring and shock swaps as this is my 3rd iteration.

The springs are obviously larger wire diameter but surprisingly have one more active coil. The wire diameter apparently more than offsets the extra coil as I gained a bit more than an inch in ride height over the stock springs.

Wanted to do this because:
-We camp often and are right at max GVWR when loaded up.
-I prefer a stiffer ride as in I much prefer the ride in my older K2500 to the wallowing cushy ride of some newer K1500's. I know some like the floating on a pillow ride, but I don't.
-There have been a few times when we ran into freeway undulations while towing that caused some minor "porpoising" so hoping this helps. Pretty rare but annoying when it happens.
-There is added weight in the front from the supercharger, intercooler, and coolant as well as a larger battery.

EDIT: Found it, here is where I got the part number https://static.nhtsa.gov/odi/tsbs/2019/MC-10166646-9999.pdf


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Interesting. Never knew there was such a chart. And now it's searchable.



Front Coil Spring Selection Chart (2WD)
GASOLINE LFX / LGZSWB / LWB
Front Left RPOFront Right RPOCheck LOADSpring RATEPart Number
&6B4.&7B4.933978.3(kg/cm)23426901
&6B1..&7B1.8680438(lb/in)23426900
&6A9.&7A9.802223426899
&6A8.&7A8.736323426898
GASOLINE LCV / LFXSWB / LWB
Front Left RPOFront Right RPOCheck LOADSpring RATEPart Number
&6D5.&7D5.933978.3(kg/cm)23426901
&6D4.&7D4.8680438(lb/in)23426900
&6D3.&7D3.802223426899
DIESEL LWNSWB / LWB
Front Left RPOFront Right RPOCheck LOADSpring RATEPart Number
&6XL.&7XL.1017190.4(kg/cm)23426905
&6XU.&7XU.9504506(lb/in)23426904
&6XT.&7XT.883723426903
&6XS.&7XS.816923426902
Front Coil Spring Selection Chart (4WD)
GASOLINE LCV / LFXSWB
Front Left RPOFront Right RPOCheck LOADSpring RATEPart Number
&6EQ.&7EQ.1017190.4(kg/cm)23426905
&6EM.&7EM.9504506(lb/in)23426904
&6EB.&7EB.883723426903
&6EA.&7EA.816923426902
GASOLINE LCV / LFXLWB
Front Left RPOFront Right RPOCheck LOADSpring RATEPart Number
&6D1.&7D1.1017190.4(kg/cm)23426905
&6C6.&7C6.9504506(lb/in)23426904
&6C3.&7C3.883723426903
&6CS.&7CS.816923426902
GASOLINE LFX / LGZSWB / LWB
Front Left RPOFront Right RPOCheck LOADSpring RATEPart Number
&6XL.&7XL.1017190.4(kg/cm)23426905
&6XU.&7XU.9504506(lb/in)23426904
&6XT.&7XT.883723426903
&6XS.&7XS.816923426902
DIESEL LWNSWB / LWB
Front Left RPOFront Right RPOCheck LOADSpring RATEPart Number
&6D8.&7D8.10856103.4(kg/cm)23141686
&6CY.&7CY.10026579(lb/in)23141685
&6CW.&7CW.919623141684
 
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