Sahara_Maverick

I saw several threads about adding an aux cooler for the auto tranny and thinking about it.

What is the normal temperature range Jeep recommends for stock Sahara? Does it vary per trim (X, Rubicon)?

Thanks!

ronjenx

Are you asking about how big a cooler is recommended?

Or what temp range the transmission operates in?

Sahara_Maverick

Temp range. Mostly what's the normal range and max temperature allowed.

I understand most folks recommend the B&M. I recently saw a thread about the Mopar but does seem to do the something as B&M.

blockrockin

mine seems to be around 160 - 180 but i have seen it close to 200* thats with 37's and 5:13 gears.. i am gonna add a trans cooler... stock seemed to be around 140- 150 sometimes less

Jiblet

well, a reasonable operating temp is about 180. The hot oil warning, I believe, is set for 220. Too hot for my taste. If I never see 180, I won't be sad.

The hotter it runs, the shorter the life of the ATF. There are graphs showing the relationship.

It was 65 here yesterday, I drove about 25 miles on the highway at about 75mph; my gauge was in the 130s. I have the B&M 13000btu cooler.

AirJordan613

Why did you pick the 13,000 over the 14,400?

ronjenx

My normal transmission temp is from 110°F to around 150°F, on roads, summer and winter.
When wheeling in the summer, it will go as high as 180, at which point I will take steps to get it back down.

No aux cooler on mine yet. I keep putting it off because I haven't seen the need yet.

Sahara_Maverick

I just installed the Bully Dog tuner and set it to display the tranny coolant's temp, which it reads from the OBD port.

Tranny temperature has been between 160 and 180F.

Jeep is stock and temperature here in Seattle in the high 50s now. Therefore, I can only imagine when it goes to upper 70s in Summer. Let alone if I travel to a place that goes above 100F. :-/

So, it seems a cooler is in order, or there's something I should check before?

ronjenx

You won't go wrong with an aux transmission cooler.

Sahara_Maverick

It looks like. But I am also concerned about something wrong, since this is just street driving.

Based on the responses it is high. So, would a cooler hold it if I decide to go wheeling and really put a load on it?