Towing with a R4 trans
#1
10-26-2018, 02:03 PM
#2
10-26-2018, 02:43 PM
Assuming you mean a 4R100, I don't think they ever offered a tow/haul mode. It won't let you tow over any kind of limit in OD, if there's enough load it will just downshift. I've towed 13k in OD, but it'll only engage on relatively flat land. As soon as a hill comes it'll downshift. I generally predict as I'm approaching a hill and downshift it manually rather than waiting for it to happen. If you have a tuner it'll probably allow more load being applied before downshifting than a stocker.
#3
10-26-2018, 04:51 PM
Lead Driver
As noted above the 4r100 doesn’t have a tow haul mode. The button on the stick is a overdrive off switch which you only need to use to hold 3rd gear if the trans is hunting 3-4, usually happens in rolling hills or slight incline depending on the load.
ypu can use it to hold speed down large grades as well.
Biggest concern with 4r100 is don’t overheat it. The 6.0 cooler swap does a great job.
also don’t back up until the fluid cools down after running at temps as it cools the pump seal.
perfect example is hard pull into the mountains with a camp trailer, and then back into a camp spot when the trans is still hot. You’ll puke fluids put of the pump seal every time. Let the trans cool down to 140-150or so before backing into your spot.
ypu can use it to hold speed down large grades as well.
Biggest concern with 4r100 is don’t overheat it. The 6.0 cooler swap does a great job.
also don’t back up until the fluid cools down after running at temps as it cools the pump seal.
perfect example is hard pull into the mountains with a camp trailer, and then back into a camp spot when the trans is still hot. You’ll puke fluids put of the pump seal every time. Let the trans cool down to 140-150or so before backing into your spot.
#5
10-27-2018, 12:02 AM
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