Delving into the 4:3 axle issue, I noted this.
My LX470 develops 320 lbs-ft torque @ 3,400 RPMs.
I'm not sure but I assume the Engine develops its maximum torque at this RPM.
I read a lot that one should tow with Over Drive OFF - and 3-rd gear ratio in
my LX470 is 1.000
I found a website that shows my 275/16 R70 tires are 31.157" -- BUT, I
measured them and they are actually 29" in diameter.
Went to this calculator which calculates Engine RPM based on tire diameter,
Axle Ratio, and Transmission Ratio ...
http://www.crawlpedia.com/rpm_gear_calculator.htm
... and find that with Over Drive OFF at 3,400 RPMs that vehicle speed is
just over 68 mph.
With OD ON, the same RPMs should be 2559 - 840 higher RPMs with OD OFF. 33% more Engine RPMs, so I assume 33% less MPG. I typically
get 14-15 MPG - so I should expect approx 10MPG towing.
I'll have to take my LX470 out and verify that 3,400 is at 68 with OD off.
Is this the reason for the towing performance of the 4:3 axle?
