Engine/Transmission (1994 - 1998) 5-speed oil Temps

[GAmes]

I pull a 13,000 lb 5er and during the summer my trans temps stay around 170 to 180 while on the highway. I have two Fast coolers installed. A couple of weeks ago I was climbing cabbage hill (I-84, east of Pendleton, Or. ) and discovered my fanclutch had died. After letting the engine cool back to 180 at a pull-off I attacked the hill again, this time in 3rd gear at about 30 mph, A/C off. The engine temp stayed at about 200 but my trans temp climbed to 220. Does anyone know at what temp Castrol Syntorq breaks down?

 

[GAmes]

It can't be so!!!

Don't tell me I've stumped the audience of this fine website.

 

[Deezul1]

Hey Gary

Are you headed back yet?

My oil temps run about what yours do without the coolers but I dont tow nears as heavy as you. I dont know for sure what the limit is but I bet 260 would be ok with the synthetic

 

[SRadke]

I'm just guessing here but I'd say 260° is pretty close. I wouldn't want it any hotter than that. My problem with that Cabbage hill is all the 45 mph corners. How am I suppose to climb it at 80?

 

[GAmes]

John, I'm back.



"My problem with that Cabbage hill is all the 45 mph corners. How am I suppose to climb it at 80? "





It could be worse, if you had a GM D/A combo and depended on their tow/haul mode to slow you down, with a 13,000 lb trailer you would be DESCENDING it at 80

:--)