200* tranny temps! Ever had this happen?
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Lead Driver
Joined: May 2007
Posts: 5,613
Likes: 9
From: Flagstaff, Arizona
200* tranny temps! Ever had this happen?
So I've been out hunting Deer all week, and 2 days ago I was doing some MAJOR 4 wheeling, doing a climb up a rocky road, in 4 wheel drive most of the way up a very VERY steep road. Regular cruising thru the woods I normally run about 150-160* temps with the Napa Ultra cool......but this very long climb up this road gradually got my temps climbing up. I'm not sure if it was just the sheer angle of the road that made the pump too weak to have it flowing........or just the fact it was being worked hard? I pulled over once I hit 200* 
It probably would've climbed even higher.....but I wasn't gonna chance it! I'm running Valvoline synthetic Mercon V fluid....which is only like 2 months old. Nothing smells burnt so I'm not worried about my fluids......I'm just curious if you guys know enough about the inner pump on the 4R100 to know if severe angles like that affect the flow? Sorry for the long winded post!
It probably would've climbed even higher.....but I wasn't gonna chance it! I'm running Valvoline synthetic Mercon V fluid....which is only like 2 months old. Nothing smells burnt so I'm not worried about my fluids......I'm just curious if you guys know enough about the inner pump on the 4R100 to know if severe angles like that affect the flow? Sorry for the long winded post!
PMS: an obsession
Joined: Jul 2007
Posts: 804
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From: Kamloops
I've had this happen pulling steep grades hunting last year before the Tru-cool, but nothing since. Hope this helps, and how is the hunting going? Starts Sept 1st here, and can't wait. Been scouting and seeing some real nice book bucks this summer myself!
Mountain Pass
Joined: Aug 2005
Posts: 212
Likes: 0
From: Brighton, CO
i hit 240* going up Ice house road to loon lake @ the rubicon pulling a 8k load. it peaked @ that temp, when i got there checked the fluid and didnt smell burnt at all. ran great the rest of the 530 mile trip home.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,723
Likes: 2,650
From: SE Florida
No, the clutches were not slipping. If they were the fluid would be black and the trans would be history.
The torque converter was slipping. It is designed to slip, that's how a torque converter works. Under heavy load, such as MAJOR four wheeling, it slips a lot and generates a lot of heat.
The pump does not have a problem with angles. If it did you would know right away. The first thing that happens when the pump sucks air is that the clutches release and you're in neutral. Clutches can't stay applied without pressure.
200F is nothing to worry about. You're not even close to a temperature to worry about. If you want it cooler, get more trans cooling. If your truck doesn't have a trans cooler in the radiator that would be a HUGE improvement in low speed trans cooling. A 6.0L cooler will help a lot, too. In my opinion it's a waste of money to do either if you are only seeing 200F. That's not hot at all.
The torque converter was slipping. It is designed to slip, that's how a torque converter works. Under heavy load, such as MAJOR four wheeling, it slips a lot and generates a lot of heat.
The pump does not have a problem with angles. If it did you would know right away. The first thing that happens when the pump sucks air is that the clutches release and you're in neutral. Clutches can't stay applied without pressure.
200F is nothing to worry about. You're not even close to a temperature to worry about. If you want it cooler, get more trans cooling. If your truck doesn't have a trans cooler in the radiator that would be a HUGE improvement in low speed trans cooling. A 6.0L cooler will help a lot, too. In my opinion it's a waste of money to do either if you are only seeing 200F. That's not hot at all.
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Lead Driver
Joined: May 2007
Posts: 5,613
Likes: 9
From: Flagstaff, Arizona
No, the clutches were not slipping. If they were the fluid would be black and the trans would be history.
The torque converter was slipping. It is designed to slip, that's how a torque converter works. Under heavy load, such as MAJOR four wheeling, it slips a lot and generates a lot of heat.
The pump does not have a problem with angles. If it did you would know right away. The first thing that happens when the pump sucks air is that the clutches release and you're in neutral. Clutches can't stay applied without pressure.
200F is nothing to worry about. You're not even close to a temperature to worry about. If you want it cooler, get more trans cooling. If your truck doesn't have a trans cooler in the radiator that would be a HUGE improvement in low speed trans cooling. A 6.0L cooler will help a lot, too. In my opinion it's a waste of money to do either if you are only seeing 200F. That's not hot at all.
The torque converter was slipping. It is designed to slip, that's how a torque converter works. Under heavy load, such as MAJOR four wheeling, it slips a lot and generates a lot of heat.
The pump does not have a problem with angles. If it did you would know right away. The first thing that happens when the pump sucks air is that the clutches release and you're in neutral. Clutches can't stay applied without pressure.
200F is nothing to worry about. You're not even close to a temperature to worry about. If you want it cooler, get more trans cooling. If your truck doesn't have a trans cooler in the radiator that would be a HUGE improvement in low speed trans cooling. A 6.0L cooler will help a lot, too. In my opinion it's a waste of money to do either if you are only seeing 200F. That's not hot at all.
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Mountain Pass
Joined: Aug 2005
Posts: 212
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From: Brighton, CO
it was pretty hot, but that particular road is damn steep. second gear pinned going about 30mph. i never get that hot normally towing.
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Lead Driver
Joined: Jan 2007
Posts: 6,708
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From: Kiowa CO
My old '99 PSD truck saw 215 degrees pulling my 5'ver up the east entrance of Yellowstone thru a construction zone. It only had the stock cooler and no OTW radiator cooler. Crawling at 10 mph, only one lane, dirt road, construction equipment everywhere and no pullouts. Not fun at all. Tranny wasn't slipping but I had my one eye glued to the gauge the entire 10 miles. Not fun but the truck survived. I did loose the front t/c seal though a few days later on that same trip. Figured that the high temps must of killed it.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,723
Likes: 2,650
From: SE Florida
Maximum trans temps:
Continuous, meaning for as long as you can drive: 221F
Short term, not to exceed 30 minutes: 252F.
Those are pan or pressure port temps. The line to the cooler can get MUCH hotter!
Continuous, meaning for as long as you can drive: 221F
Short term, not to exceed 30 minutes: 252F.
Those are pan or pressure port temps. The line to the cooler can get MUCH hotter!
Elder User
Joined: Oct 2005
Posts: 786
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From: Reno nv
Now the hard one: whay did they stick a car trannyin the SD's?
Lead Driver
Joined: Jun 2007
Posts: 7,760
Likes: 27
From: Hampton, Maryland.
Nope, it is a big fluid fan basically Ron. An impeller really.