Originally Posted by JIMBOX
Those are all recommendations for --STOCK---conditions counslor-
All graphs/files/folders/lists are data compiled for SPECIFIC reasons and we couldn't care less about SPECIFIC reasons, cause we own JEEPS-
How about- Chrysler-produces the 3.8L v6 (jeep) and recommends 5w-20 oil--now they produce the 3.6L Jesus engine, with TWICE the rotating parts and recommend 5w-30-gofigure !
A thoughtful observation that no doubt holds some truth.
For example, stating a needlessly low "limit" will allow Auburn to deny warranty coverage if your D30 locker busts while spinning 35s (or 33s, or 32s). That means they essentially no warranty liability even though they get to sell lockers to folks who didn't bother to read the chart and have upsized tires on their D30s. A savvy (if not really ethical) way for Auburn to keep costs down.
On the other hand, surely there's something to it? Auburn is no doubt losing sales as a result of the low stated limit. How many people really buy something like this without even reading the tire size chart that Auburn itself provided to Q-tec as one of only three digital images to post online associated with the product?? And if the locker in a D30 can in reality easily handle 31" tires, why not at least bump up the recommended "limit" to 32" tires so as to scoop up the stock
JK market? I can't believe that 32" tires would open a whole lot of warranty liability if the locker really is far sturdier than would be required for 31s.
And even then, I dunno . . . . It just seems very low to me--I mean good Lord, 31"??? Any JK that installs aftermarket lockers is almost certainly going to have at least 33s. So Auburn's own documents essentially exclude any JK sales of a front locker. I just can't see a really good reason for that unless there was at least some legitimate mechanical concern.
Originally Posted by 3JKs1H1
MTH, that problem might be that the locker will put quite a bit of stress on the axles and ring and pinion. 100% lockup on a rocky surface will put the driveline under quite a bit of strain.
This is a good counterargument to what I just stated above to Jimbo. So perhaps the recommended "limit" has less to do with the locker and more to do with the R&P and the axle? In other words, Auburn isn't saying their D30 locker can't handle bigger tires and offroading, but that the D30 axle or R&P might not. Does Auburn make other more traditional lockers? If so, I suppose further research into those products would show whether Auburn always recommends a limit of 31" tires on a D30 regardless of what type of locker you use. A look at other manufacturer's recommended limits might also be instructive.
Still . . . if I were Auburn I wouldn't want to leave this ambiguity in my own documents. I'd change my chart to make clear that while the lockers themselves can handle huge forces, Auburn recommends limiting certain axles to certain tire sizes because it is Auburn's opinion that those axles and matching R&Ps can only handle being locked up to particular tire sizes.