just looking for what some typical temps for certain conditions for a transmission would be. these are all for a 2000 4r70w. wondering what temp it would normally operate under with a stock setup (cooler in radiator, stock trans pan) and with aftermarket coolers/trans pans. thanks, Dave
With a 28,000 GVW B&M cooler only (not run through a heat exchanger in a radiator), I usually see temps around 150 degrees when crusing around in 60-95 degree weather. It runs a little cooler and takes a bit longer to warm up in colder temperatures, but the car doesn't get driven in cold weather much.
Yup, with a plate type cooler mine ran about 150 cruising, went up to 175-ish if I drove in summer stop and go traffic, and kissed the 185 mark if I really drove it hard. Would always cool back down to 180 right away though, and no I didn't have a t-stat in my cooler.
2nd Gear Poster
Join Date: Sep 2007
Location: West Chicago
I put a B&M cooler and temp gauge on last winter and I never got the fluid temp above 100 (I also ran it through the radiator). Running with only the stock cooler my temp says about 140 if I cruise at about 65-70 for up to three hours. If you haul *** on the highway with a stock trans and TC expect an overheated transmission. If I have to drive for more than 4 hours I allways hook my trans cooler up. If you take your Bird on a road trip a trans cooler is a must.
4th Gear Poster
Join Date: Oct 2005
Is there such a thing as it being too cool? Having the cooler in the radiator keeps it close to coolant temp and isn't that its designed operating range? If the heat is not correct will the properties of the fluid be off and mess things up?
1996 sport 4.6 130k and still strong.
1991 SC 3.8 project and toy.
1st Gear Poster
Join Date: Jul 2006
Location: easton pa
As a rule that I learned in school you dont want to go over 175. Id say get the temps around 150 for cruising and 175 for beating on it.
Originally Posted by ncoop23 View Post
I drove my Town Car when the temps were in the teens with a cooler and never had a lick of problems shifting or driving.
To make a long story short - "I don't think so Tim..."
Actually the fluid can be too cold. Some transmissions even block the TC from lockup until the trans is up to temp. Best temperature range is 160-180°F. That reading is for the output to the cooler, if you have the sensor in the pan, you'd want more like 140-160°F
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