Yep slow crawling uphill, my SCll reported temps up to 250! I have a B&M 70268 seperate from radiator, and it was starting to smell "burnt." Pulled over, let 'er cool down to normal (engine running in park to allow the rad fan to do it's job) and went back down the hill. Engine was at 190 when the temp rose, I can assume the fan was running, correct? I'm guessing second cooler and aftermarket fan, can ayone advise? Really makes me not want to get BudBuilts now... burt mostly just glad I had the SCll installed and was paying attention! BTW my normal trans temp is in the 130-150 range this time of year.
4w hi, D2 = 250 Tranny temp??!?
- Thread starter thor999
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kball
New member
Sounds about right to me. I've seen mine go well over 200 while going up slow winding mountain roads. I don't believe the radiator cooler would do any better. A 70264 would probably do marginally better. My personal opinion is temps that high for short periods of time is considered normal. Change your fluids once in a while and use synthetic or syn blend and you should be good to go.
BrianSD_42
New member
I've used 4LO on dirt roads. 4LO is great offroad when going less than 25 MPH
Drcoffee
Senior Member
HELLO!
You disconnected the trans cooler from the more efficient radiator and then added a wimpy cooler to replace it. What part of this equation dont you understand?
Ive been trying to tell people this for a year now. If you drive in suburbia you might be able to get away with that setup. But if you experience high ambient temps or make the 5000 pound truck work a little harder, you need more cooling capacity. The 70268 is good for small cars. Yank that crap out and either add two 70264 coolers (or bigger) or reconnect the radiator with one 70264 cooler. But if you desperately want to replace your transmission, keep what you have.
-transmission-cooler-to bypass-radiator or not bypass.html
If this doesnt prove my case? Nothing will
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oh hell its Dr. Coffee! 
well we've pretty well covered the pink milkshake thing, so no, I won't be adding my trans to that list any time soon, but you do have valid points! OK will definitely drive in 4lo next time, what do you guys think of replacing the rad (not stock, but at least 8 years old now; has silver marker written on top so I assume it is a junkyard replacement) and ADDING a 70264 to the equation? Does anyone feel the stock fan could be an issue as well i.e. is it thermostat controlled?
well we've pretty well covered the pink milkshake thing, so no, I won't be adding my trans to that list any time soon, but you do have valid points! OK will definitely drive in 4lo next time, what do you guys think of replacing the rad (not stock, but at least 8 years old now; has silver marker written on top so I assume it is a junkyard replacement) and ADDING a 70264 to the equation? Does anyone feel the stock fan could be an issue as well i.e. is it thermostat controlled?Actually I stopped at 246, do you feel I should replace the fluid at this point? It was VERY happy prior to this (I haven't checked it yet...)
kball
New member
According to Toyota it says IF the trans temp light comes on, stop and let it go out. If it does, keep driving. If it doesn't call for a tow. Your light didn't even come on and probably wouldn't for another 25+ degrees. So according to Toyota you were within normal operating specs.
Notice, "continued driving with the light on "MAY" damage the trans..."
Notice, "continued driving with the light on "MAY" damage the trans..."
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pat161
New member
You definitely have the tranny overheat light, it wasn't an option, just there.
Now whether it still works on you 01 is another matter, but I would imagine it does and you are fine. Check to see if the fluid is smelling a bit burnt, if your not fully comfortable change it.
I think that blurb from Toyota is pretty funny. It says if the light comes on stop and put it in P and idle until the light goes off. If it does you can re-start the truck and drive on. Last I knew idling was still running, so how can you then re-start the truck? Do you have to turn off and then back on once the light goes off. And please understand I don't need explanations as I am not worried at all and know what I would do, just pointing out that the warning in not clear as to the proper procedure.
Now whether it still works on you 01 is another matter, but I would imagine it does and you are fine. Check to see if the fluid is smelling a bit burnt, if your not fully comfortable change it.
I think that blurb from Toyota is pretty funny. It says if the light comes on stop and put it in P and idle until the light goes off. If it does you can re-start the truck and drive on. Last I knew idling was still running, so how can you then re-start the truck? Do you have to turn off and then back on once the light goes off. And please understand I don't need explanations as I am not worried at all and know what I would do, just pointing out that the warning in not clear as to the proper procedure.
Full_Throttle
New member
I think the key here is proper air flow over the external cooler. When I did mine, I added an electric fan to the front of my external cooler and toggled it manually. When my tranny temps would hit 200 degrees, I would flip on that fan and watch them drop. The only time this didn't help was in the Colorado mountains running 75 MPH in the summer(interstate)...I hit 220 degrees with the fan on. I recommend two external coolers + a fan. The whole reason we do this to our rigs is to protect the tranny....spend a few more $$ and REALLY protect that tranny
Hell i did just that without knowing, just made sure the fan was running.
