Transmission Question
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New User
Joined: Aug 2007
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Transmission Question
I have a 2003 F-150 about 200,000 miles. 4.6 V8. Auto trans.
My problem: When its warm outside (about 85* or higher) and after driving for a while (20 minutes +) at 45 to 60 mph it feels like I am going over railroad tracks. Like maybe the transmission is slipping. The tran fluid was changed 8000 ago, level is still good, and tran filter was changed. Pan and filter were clean (no shavings) when that was done. As of right now, no burnt smell. I also have hypertech program.
What do you think is causing the slip or the rattle/shaking????
I am thinking about putting in Redline synthetic tran fliud and new alum pan + a tran cooler. What do you think will it help?
Any better suggestions? I am tight on money, so any info on what works best or any better ideas (what works best) would help.
Thanks!
I would like to keep this going until the payments are done (next year!)!
My problem: When its warm outside (about 85* or higher) and after driving for a while (20 minutes +) at 45 to 60 mph it feels like I am going over railroad tracks. Like maybe the transmission is slipping. The tran fluid was changed 8000 ago, level is still good, and tran filter was changed. Pan and filter were clean (no shavings) when that was done. As of right now, no burnt smell. I also have hypertech program.
What do you think is causing the slip or the rattle/shaking????
I am thinking about putting in Redline synthetic tran fliud and new alum pan + a tran cooler. What do you think will it help?
Any better suggestions? I am tight on money, so any info on what works best or any better ideas (what works best) would help.
Thanks!
I would like to keep this going until the payments are done (next year!)!
Senior User
Joined: Sep 2007
Posts: 123
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Have you had the rear differential kept up? New lube every 60k miles? If not, take a look at your differential.
With bad oil in the differential, it seems to me that the oil would be doing no good to lube the rear differential, causing an excess amount of heat, which could cause breakdown in the gears, leading to the symptoms you are noticing due to the breakdown of the gears in the differential.
Just an idea.
With bad oil in the differential, it seems to me that the oil would be doing no good to lube the rear differential, causing an excess amount of heat, which could cause breakdown in the gears, leading to the symptoms you are noticing due to the breakdown of the gears in the differential.
Just an idea.
Postmaster
Joined: May 2003
Posts: 3,310
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From: E.Lincoln County, NC
Does it just do it when you lightly accelerate or all the time? Sounds kind of like torque converter shudder which you can cure with a bottle of FORD FRICTION MODIFIER. It's cheap and if it doesn't cure your problem it doesn't hurt anything. It was recommended for our Crown Vic police car fleet by Ford.
Do a search on "torque converter shudder" and/or read here:
https://www.ford-trucks.com/forums/4...out-of-me.html
Do a search on "torque converter shudder" and/or read here:
https://www.ford-trucks.com/forums/4...out-of-me.html
Thread Starter
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New User
Joined: Aug 2007
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I have had the rear end re-built @ ford 100,000 ago, and I have always kept up on maint. so that cant be the problem. I know its the tranny.
It also does only do the shudder on light acceleration. So, I will try fords AFM Thanks. I hope it works.
It also does only do the shudder on light acceleration. So, I will try fords AFM Thanks. I hope it works.
