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This past weekend I looked over a number of Chevy, Ford and Dodge trucks that all towed 30'+ travel trailers or fifth wheels. They all had one thing in common...they were all running 35" or larger tires. Some lifted, others not but all of them had larger tires. I use to never be concerned about wheel/tires loads but I have been thinking about it more and more.

So my question is this: If on a 2500HD the truck comes with 245 E rated @ 3042lbs and you replace them with a set of 315s that are D rated @ 3195lbs you are still okay right? Taking my question a step further when people replace the factory wheels with aftermarket wheels they aren't always rated to hold what the tires can. Some wheels are rated at 2700lbs and others go up to 3200-3400. Again on a truck with 315s rated @ 3195lbs but the wheels are only rated @ 2800 lbs your load/towing capacity is decreased correct?

Does anyone know what the factory wheels are rated at and what the minimum load rating capacity in lbs is for tires on a 2500HD or 3500 truck?
 

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It's like a chain, the strength of the weakest link is as much as you can pull( or carry).


Steve
 

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The rear axle spring cap is 6084# (axle is 6900#) so the rims and tires need to be over that.
 

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Dmax Tim said:
The rear axle spring cap is 6084# (axle is 6900#) so the rims and tires need to be over that.

Where did you get the info that the rear axle is only rated for 6900 lbs?


The 2500HD and the 3500 share the same axle, which I understood was an AAM 1150, rated for 10,890 pounds. The tires are the limiting factor for the rear weight rating of the 2500HD's, being that the combined capacity of the OEM pair is exactly the 6084 pounds of the published rating.
 

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how about this HD 2500



<TABLE borderColor=#999999 cellSpacing=0 cellPadding=2 width="95%" border=1>
<T>
<TR>
<TD class=content> </TD>
<TD class=content>Crew Cab - Short Box
2WD
TC25743</TD>
<TD class=content>Crew Cab - Short Box
4WD
TK25743</TD>
<TD class=content>Crew Cab - Long Box
2WD
TC25943</TD>
<TD class=content>Crew Cab - Long Box
4WD
TK25943</TD></TR>
<TR>
<TD colSpan=5>Specifications</TD></TR>
<TR>
<TD>Front shock absorber diameter, in. (mm) </TD>
<TD align=middle>1.38 (35) </TD>
<TD align=middle>1.38 (35) </TD>
<TD align=middle>1.38 (35) </TD>
<TD align=middle>1.38 (35) </TD></TR>
<TR>
<TD>Front stabilizer bar diameter, in. (mm) </TD>
<TD align=middle>1.25 (32) </TD>
<TD align=middle>1.25 (32) </TD>
<TD align=middle>1.25 (32) </TD>
<TD align=middle>1.25 (32) </TD></TR>
<TR>
<TD>Rear shock absorber diameter, in. (mm) </TD>
<TD align=middle>1.38 (35) </TD>
<TD align=middle>1.38 (35) </TD>
<TD align=middle>1.38 (35) </TD>
<TD align=middle>1.38 (35) </TD></TR>
<TR>
<TD>Rear stabilizer bar diameter, in. (mm) </TD>
<TD align=middle>TBD</TD>
<TD align=middle>TBD</TD>
<TD align=middle>TBD</TD>
<TD align=middle>TBD</TD></TR>
<TR>
<TD>Turning diameter, curb-to-curb, ft. (m) </TD>
<TD align=middle>49.6 (15.1) </TD>
<TD align=middle>49.6 (15.1) </TD>
<TD align=middle>53.6 (16.3) </TD>
<TD align=middle>53.6 (16.3) </TD></TR>
<TR>
<TD colSpan=5>Capacities</TD></TR>
<TR>
<TD>Front axle, lbs. (kg) </TD>
<TD align=middle>4800 (2177) </TD>
<TD align=middle>4800 (2177) </TD>
<TD align=middle>4800 (2177) </TD>
<TD align=middle>4800 (2177) </TD></TR>
<TR>
<TD>Front spring capacity, lbs. (kg) </TD>
<TD align=middle>4500 (2041) </TD>
<TD align=middle>4800 (2177) </TD>
<TD align=middle>4800 (2177) </TD>
<TD align=middle>4800 (2177) </TD></TR>
<TR>
<TD>Rear axle, lbs. (kg) </TD>
<TD align=middle>6900 (3130) </TD>
<TD align=middle>6900 (3130) </TD>
<TD align=middle>6900 (3130) </TD>
<TD align=middle>6900 (3130) </TD></TR>
<TR>
<TD>Rear spring capacity, lbs. (kg) </TD>
<TD align=middle>6084 (2760) </TD>
<TD align=middle>6084 (2760) </TD>
<TD align=middle>6084 (2760) </TD>
<TD align=middle>6084 (2760) </TD></TR>
<TR>
<TD>Curb weight, lbs. (kg) </TD>
<TD align=middle>5578 (2530) </TD>
<TD align=middle>5858 (2657) </TD>
<TD align=middle>5738 (2603) </TD>
<TD align=middle>6019 (2730) </TD></TR>
<TR>
<TD>Cargo volume, cargo box, cu. ft. (liters) </TD>
<TD align=middle>56.9 (1611.4) </TD>
<TD align=middle>56.9 (1611.4) </TD>
<TD align=middle>70.7 (2002.2) </TD>
<TD align=middle>70.7 (2002.2) </TD></TR>
<TR>
<TD>Payload<SUP>1</SUP>, lbs. (kg) </TD>
<TD align=middle>3622 (1643) </TD>
<TD align=middle>3342 (1516) </TD>
<TD align=middle>3462 (1570) </TD>
<TD align=middle>3181 (1443) </TD></TR>
<TR>
<TD>Gross Vehicle Weight Rating (GVWR), lbs. (kg) </TD>
<TD align=middle>9200 (4173) </TD>
<TD align=middle>9200 (4173) </TD>
<TD align=middle>9200 (4173) </TD>
<TD align=middle>9200 (4173) </TD></TR>
<TR>
<TD>Front Gross Axle Weight Rating (GAWR), lbs. (kg) </TD>
<TD align=middle>4410 (2000) </TD>
<TD align=middle>4670 (2118) </TD>
<TD align=middle>4670 (2118) </TD>
<TD align=middle>4800 (2177) </TD></TR>
<TR>
<TD>Rear Gross Axle Weight Rating (GAWR), lbs. (kg) </TD>
<TD align=middle>6084 (2760) </TD>
<TD align=middle>6084 (2760) </TD>
<TD align=middle>6084 (2760) </TD>
<TD align=middle>6084 (2760) </TD></TR>
<TR>
<TD>Fuel capacity, approximate, gallon (liters) </TD>
<TD align=middle>26 (98) </TD>
<TD align=middle>26 (98) </TD>
<TD align=middle>34 (129) </TD>
<TD align=middle>34 (129) </TD></TR>
<TR>
<TD>Seating capacity (front/rear)</TD>
<TD align=middle>3/3</TD>
<TD align=middle>3/3</TD>
<TD align=middle>3/3</TD>
<TD align=middle>3/3</TD></TR></T></TABLE>





3500



<TABLE borderColor=#999999 cellSpacing=0 cellPadding=2 width="95%" border=1>
<T>
 

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Dmax Tim-


I can see why you would think the rear axle is only rated for 6900 pounds based on this GM information chart. However, the 2500HD's do have the same AAM 1150 rear axle as the 3500's. The AAM 1150 axle is rated at 10,890 pounds capacity, per the manufacturer. Check out the following link, which lists specs for various AAM axles. Scroll down to the 1150 and convert the 4950kg rating they show to pounds to arrive at 10,890.


http://www.aam.com/technology/tech_prod_dl_rearaxle.html


GM probably published the 2500HD specs this way to avoid liability if someone beefed up the rear tires and springs, had a problem and then used the excuse that the axle was rated for almost 11K from GM.
 

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Dmax Tim said:

For 2500HD and 3500 trucks, I might be wrong, but I think Eaton G80 http://www.automotive.eaton.com/product/traction_stability/lockingdiff.html is the same as AAM TracRite LK http://www.aam.com/technology/tech_prod_dl_diff.html#TRLK





Anyway, to answer the other question, yes, the front "axle" is AAM925 http://www.aam.com/technology/tech_prod_dl_frontaxle925.html


All the old GM "Corporate" axles are now AAM.
 
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