Tranny Slipping??
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Joined: Dec 2001
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From: Cabot, Arkansas
Tranny Slipping??
I own a 2001 F-250 Crew Cab with the V-10 & 4R100 auto tranny which is just reaching 30,000 miles. It did something strange today while driving...
While driving up approximately a 4% grade at 45 MPH in OD without a trailer or load and while slowly accelerating I began to get a slight slipping in the transmission. The acceleration was not enough to make it downshift. However, it acted like it wanted to, but couldn't make up it's mind and would start to slip ever so slightly.
Is this another 4R100 gone bad? At least I'm still under warranty and with a stock truck. I'm headed to the dealer for servicing next week. Just think, I almost bought a chip to modify my shift points and line pressures!
Edmo
While driving up approximately a 4% grade at 45 MPH in OD without a trailer or load and while slowly accelerating I began to get a slight slipping in the transmission. The acceleration was not enough to make it downshift. However, it acted like it wanted to, but couldn't make up it's mind and would start to slip ever so slightly.
Is this another 4R100 gone bad? At least I'm still under warranty and with a stock truck. I'm headed to the dealer for servicing next week. Just think, I almost bought a chip to modify my shift points and line pressures!
Edmo
Last edited by Edmo; Jan 3, 2004 at 06:06 PM.
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Joined: Nov 2003
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From: Allen, Tx
It may not be this but it's a cheap check:
If it doesn't happen on level ground, perhaps your transmission fluid level is too low. The oil pickup tube is towards the front of the transmission and when you're going up a grade, the fluid, especially when low, will pool towards the rear of the transmission pan. The pickup tube might be sucking air instead of oil. This happens more on the 4x4 because you have a deeper transmission pan.
Drive the truck for 10 minutes, put the parking brake on, the transmission in D and check the transmission oil level.
A co-worker and I had the same problem on a 99 F250 4x4 Automatic. We were climbing out of a flood-plain levy (The truck sat at a 45 degree angle) when it started slipping. We took the truck to Ford. We were told that 1) the oil level was too low, and 2) the person who did the last trasmission filter/oil change put a 2wd filter instead of a 4wd filter. The 2wd have a shallower pan and a thinner filter at the base so the pickup tube/filter assembly wasn't pulling any oil into the valve body.
BTW, those V10's are really impressive engines. I've always had 6's and small v8's and I've never been able to keep the truck in OD at 45mph while going up 3% or higher grade slopes. Too bad the gas mileage isn't that great.
If it doesn't happen on level ground, perhaps your transmission fluid level is too low. The oil pickup tube is towards the front of the transmission and when you're going up a grade, the fluid, especially when low, will pool towards the rear of the transmission pan. The pickup tube might be sucking air instead of oil. This happens more on the 4x4 because you have a deeper transmission pan.
Drive the truck for 10 minutes, put the parking brake on, the transmission in D and check the transmission oil level.
A co-worker and I had the same problem on a 99 F250 4x4 Automatic. We were climbing out of a flood-plain levy (The truck sat at a 45 degree angle) when it started slipping. We took the truck to Ford. We were told that 1) the oil level was too low, and 2) the person who did the last trasmission filter/oil change put a 2wd filter instead of a 4wd filter. The 2wd have a shallower pan and a thinner filter at the base so the pickup tube/filter assembly wasn't pulling any oil into the valve body.
BTW, those V10's are really impressive engines. I've always had 6's and small v8's and I've never been able to keep the truck in OD at 45mph while going up 3% or higher grade slopes. Too bad the gas mileage isn't that great.
Last edited by n578md; Jan 3, 2004 at 07:24 PM.
