RPMs would be higher at same speed as 3.73's at say, 65 mph. Might be able to go off that for sure.
I also have a jlu sport altitude haven't had the splines counted. To the best of my knowledge all diesel rubicon's come with the same 373 gears. And thats for all diesels regardless of trim level. I'm on a similar path of wanting lockers my JLUAD. Most likely go ARB air lockers but if it's cost-effective I would consider the OEM electronic. If it's the Rubicon Dana 44 axle I believe it should have the pre-cut access hole for the electronic Locker wire? I've already checked mine and I don't but now you got me wondering could it be 4:10s. And how many more of us might have the same if we were to count our splines. There seems to be some contradictions when people like myself put the larger tires on and are able to achieve 8th gear on the highway and others are not without regearing. You opened up a Pandora's Box can't wait to find out more.
So the postulation is that Jeep accidentally put 4.10's in your 3.0L Wrangler? They also accidentally got both axle ratios to match, and they purposefully ignored that 3.73's were called for. And your mechanic/s counted splines and came up with this fantasy? LOL. I mean, I suppose it's possible.
What I have done is tape a string to the bottom of the drive shaft and mark the side of the tire at the bottom. Move the vehicle exactly one tire revolution and then look at the string. You should be able to tell if it is more or less than four revolutions.
I am not saying they accidently did that at the factory, I am suggesting they may have run out of the spec parts and used what they had which may have been the Rubicon parts. Pandemic and all.
Thanks for the correction
STOP STEALING MY PARTS!
Interesting I have a 2020 JLU Altitude diesel, with the tow package. I called Dana, a few weeks ago to try and determine if I had limited slip as indicated on my window sticker. They had me look for identification badging on the axle I cannot find one anywhere they said on the JK's they use to have a tab that hung off one of the housing bolts. I literally looked everywhere all over the housing and could not find any number that correlated with anything they could identify with. When I gave them the VIN number they also stated I have the 373 gearing. I'm running 17" Icon's with 37's. I have yet to flash anything at the dealer and do not have the Tazer JL since I run the Banks setup. I'm able to run 8th gear on the highway in most cases when exceeding 65 mph depending on the grade. Tons of power and torque so you got me wondering ??. Wasn't sure of the Altitude Edition at the time. It was very limited just as the pandemic hit and the production line got shut down but I don't regret the Altitude Edition at all I would probably do it again.
