Just finished a 800 mile tow with a 2008 RX350. I used a Cary-on 4X8' trailer. It was loaded to around 1 ton, with 230 lbs on the ball.

I would say that the brakes and suspension did wonderfully well. I had no trouble at all driving up to 65 mph, and at times edged up over 70 but there was a little rumbling and a little sway, so I kept it around 66 the whole way.

No trouble accelerating or stopping.

The only trouble I did have was with the transmission. If I left it in overdrive, when I tried to go up a hill it would sometimes get stuck halfway between 4th and 5th gear (cruise control on)! By "stuck" I mean the following. At 66 the RPM was around 2000 in 5th, and around 2800 in 4th. Sometimes going up hill it would be running at 66 mph, but the RPM would hover around 2400! In other words, it was like it was in 4 1/2th gear. Since this seemed like it would be a bad thing, I pretty much shifted it manually to 4th every time I saw a hill coming.

I am not sure I saw a meaningful difference in the gas mileage between leaving it in 4th, or manually shifting from 4th to 5th depending on terrain, so next time I will probably just leave it in 4th unless I am drving thru very level terrain.

 

thats common for gears to not be in the right power band if its on D. they are not that smart to know what your conditions are.
for trucks they have the haul mode so they can stay in a gear longer.

having the tranny shift automatically to a lower gear to be in the right powerband is the same thing as you shifting it down manually. it only hurts your vehicle if you shift down at high rpm and making it jerk back.

 

This was not it shifting from one gear to the other. This was it getting stuck in between gears for something like 40 seconds.

 

I have the '08 RX350 w/towing prep pkg... though I don't think I can tow anything what just that... can you shed some light on what to purchase so I can tow stuff?

Tnx.

 

you applied more gas and it still was stuck?

 

We have been successfully towing our 2600-2800 lb boat/trailer on our family RX330 AWD. No real struggles, tranny will downshift when needed, just keep it around legal speed limit.

 

It was in cruise control when it did this, so it was applying more gas automatically as it started up the hill.

I do not remember exactly what it did if I manually applied more gas.

What I do remember is that if I tapped the brakes to get it out of cruise control then it would shift into one gear or the other.

 

I just got an 05 RX330 with factory tow package. I towed by 19' skiboat fine. Not issues. It is 3000 Lbs and does not have trailer brakes.

 

The difference is engine speed is likely the torque converter clutch (TCC) which drops the engine speed by about 200-250 RPM when engaged. Therefore 4th with and without TCC would make it feel like 4 and 1/2.

 

I'm asking the same question. Got the tow prep pkg but need to purchase the tow hitch and ball. Did 'yall buy your RX ready to tow or did you purchase the tow hitch later? Did you have Lexus install it or an independent ? I assume they synchronized your lights with your trailer too ?

 

The towing package is a transmition cooler and heavy duty radiator. The hitch package when purchased from the dealer includes the wiring harness. I got a quote of $350 for parts and $650 for parts and install. I bought my car pre-owned with the hitch already installed. I saw a post somewhere on install, seemed very easy. Good luck!

 

Did some research last night. Several web sites sell the hitch for $250-300 and the wiring harness around $45. Install is a simple remove bolts that are all ready in frame holding tow rings and remove a couple of rubber gromets and then bolt the hitch to frame through existing holes and torque to 36 ft lbs. Also the tow prep pck also includes a heavy duty alternator. This will save you the $300 plus in labor charges. Supposed to be a 35 minute job which translates for me about 2 hours

 

I just bought a hitch from Lexus which came with a harness.. I plugged it into the socket in the back in one of those storage compartments.. but nothing happens..

any ideas where it supposed to plug into? i have a 2004 RX330 non towing package