1300 mile tow report

JoeRacer302 · May 18, 2016

RobertHyatt said: ↑

I don't follow, only in a 1-1 (direct drive) gear do the input and output shafts spin at the same speed. In lower gears (1-2-3) the input shaft spins successively faster than the output shaft as you shift to a numerically lower gear. 5th is overdrive where the output shaft spins faster than the input shaft.

The main issue is to have the torque converter locked. If it is up-shifting and down-shifting this is not happening, and the TC really heats the oil due to the slippage it intentionally introduces to make shifting less damaging. If you want hot fluid, hold the brake and stamp on the accelerator to run the engine up to stall speed. Temps will climb _in a hurry_. And the output shaft is not moving at all. Another source of much heat is the bands used to shift the gears. Just like brake shoes. The bands have to clamp down on the ring gear to freeze it so that the planetary/sun gears are used to drive the output. More heat.

The part about the oil pump is spot on. The faster the input shaft spins, the higher the oil flow, which helps with cooling. But you don't want all the shifting as you get heat from multiple sources. And since everything is steel, it takes time to wick the heat away from the gears, through the fluid, and out into the air via the tranny oil cooler(s).
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See my follow up post after that where I explain that I was incorrect and only the single 1:1 gear has input/output speeds the same. Just a mistake on my part that I tried to clarify later on in the thread.

bigfoote13 · Jun 27, 2016

Great write up. I am surprised it didn't walk on you at 75 with the single axel.

WOTaco · Jun 27, 2016

bigfoote13 said: ↑

Great write up. I am surprised it didn't walk on you at 75 with the single axel.
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Rock steady. Lots of tongue weight with the axle being where it is and the lack of a motor to counter balance it a little.

Pportera · Jun 27, 2016

why do yall think the auto is rated at 6800lb and the manual 6500lb?? seems backwards to me.

WOTaco · Jun 27, 2016

Pportera said: ↑

why do yall think the auto is rated at 6800lb and the manual 6500lb?? seems backwards to me.
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It varies across all the trim levelels, cab and drive train configurations. According to the brochure my TRD DC OR 4x4 MT is rated at 6400lbs and so is the same truck with an auto. The TRD DC OR 4x2 auto is rated at 6700lbs.

Found here. http://www.toyota.com/tacoma/ebrochure/ Scroll down to towing capacities.

moab4x432 · Jun 28, 2016

smmarine said: ↑

I tow in overdrive all the time. As long as your trans isn't gear hunting, it's not going to hurt the transmission. Heat kills transmissions
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The third gen automatics gear hunt going downhill with a tail wind....

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1300 mile tow report

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