Transmission temperature question
We just came back from a week of camping, driving from Colorado Springs to Ridgway State Park near Ouray and back. We drove Hwy 50 over Monarch Pass. This was our first time going over a truly high ...
Forum Discussion
theoldwizard1 wrote:
That chart is ancient history !
I worked in transmission engineering for one of the Big 3 back in the 80s. Even THEN, sustained temps under 230F were hot, but did not cause fluid or component failure.
Today, almost ALL transmission fluid is synthetic or synthetic blend and can comfortably handle 250F. Under 200F is ridiculous because most transmission coolers are inside the radiator and the engine coolant temperature is typically over 200F !
Don't get me wrong. Yes, you should check your transmission fluid regularly, more often if you are towing or carrying heavy loads. If it smells burnt or is NOT bright cherry red, it is time for a change. And use the EXACT fluid recommended by the manufacturer, Skip the "boutique" stuff !
Sure, keep it cool is the best policy, but lets be realistic !!
IDK. I added a large trans cooler in series with the stock GM cooler.
If I sit and idle with the silveradi the trans temp will match the coolant temp of 190f - 200f.
But driving to florida ( was 100 F outside most days) I crused at 160f trans temps and 190- 200f coolant temps.
Here is screen shot. This was in GA getting into florida crusing 75 mph at 11500 lbs.
Going in the smoky moantains the truck got hotter then the trans did. I think the truck got around 230-240f pulling grade to 5000ft and the trans never went over 190f.
Heres a vid pulling mountain grade. 1st gear 3500 RPM 30 MPH.
trans 175f
Coolant 230f
https://www.flickr.com/photos/93289479@N04/shares/GvSNN4
And trans cooler I moved factory unit down below the bowtie emblem
Put the biggest I could fit next to it.
Good thing is with A/C on the cooling fans run. I dont think we had the A/C off the whole trip..
I belive over 200F for a trans is too hot.
