Tranny Woes
Thread Starter
|
New User
Joined: Oct 2006
Posts: 20
Likes: 0
Tranny Woes
and no, it's not the kind your run into in the sketchy bar......
My transmission isn't shifting right. It costs fine and and drives fine under light load, but when ever I'm in OD and and try to speed up without dropping a gear or whenever I'm towing (empty single axle trailer) while in OD, it feels like my brakes are pulsating. I'm pretty sure it's not the brakes themselves (no light and it doesn't do it when I'm actually braking), but it actually slows the truck down, not just loose power. They only last about a quarter second, but they'll pulsate pretty fast (twice a second)
Any ideas?
My transmission isn't shifting right. It costs fine and and drives fine under light load, but when ever I'm in OD and and try to speed up without dropping a gear or whenever I'm towing (empty single axle trailer) while in OD, it feels like my brakes are pulsating. I'm pretty sure it's not the brakes themselves (no light and it doesn't do it when I'm actually braking), but it actually slows the truck down, not just loose power. They only last about a quarter second, but they'll pulsate pretty fast (twice a second)
Any ideas?
Thread Starter
|
New User
Joined: Oct 2006
Posts: 20
Likes: 0
yea, for the '02. 4.2L engine, 4R70W tranny.
It's not something that progressively got worse. Got dressed one night to head to a friends and it started doing it.
Changed the tranny filter and flushed the pan twice (4 quarts each time, only been about 10K since my last tranny flush) and it did not help any, so I'm guessing it's some little sensor or the TCM.
It's not something that progressively got worse. Got dressed one night to head to a friends and it started doing it.
Changed the tranny filter and flushed the pan twice (4 quarts each time, only been about 10K since my last tranny flush) and it did not help any, so I'm guessing it's some little sensor or the TCM.
Thread Starter
|
New User
Joined: Oct 2006
Posts: 20
Likes: 0
engine idles find and I can sit it in the garage and race it with no miss
I actually feel the truck draw back then continue forward, almost like it just randomly kicks down a gear then jumps back very quickly
Also, I can slam down on the gas, kick out of OD, and it accelerates normally. really only does it when I'm about 1/2 way on the gas (speeding up from 40-50 while coasting)
I actually feel the truck draw back then continue forward, almost like it just randomly kicks down a gear then jumps back very quickly
Also, I can slam down on the gas, kick out of OD, and it accelerates normally. really only does it when I'm about 1/2 way on the gas (speeding up from 40-50 while coasting)
Transmission Rebuilder
Joined: Jul 2008
Posts: 1,570
Likes: 63
From: North Georgia
You wont have a miss just revving the engine in park, there is no load on the engine.
In overdrive pulling a grade with the converter clutch applied is when the engine miss will be more noticeable.
Sometimes you can catch the miss by power braking in drive, don't let the tire spin and don't do it for long, it can generate a lot of heat.
In overdrive pulling a grade with the converter clutch applied is when the engine miss will be more noticeable.
Sometimes you can catch the miss by power braking in drive, don't let the tire spin and don't do it for long, it can generate a lot of heat.
Thread Starter
|
New User
Joined: Oct 2006
Posts: 20
Likes: 0
a miss wouldn't throw a light or anything? I've got a OBD scanner and it's coming up with nothing, as is the scanner from Vatozone
I'm going to go give that parking brake thing a try, hope the neighbors don't mind..
I'm going to go give that parking brake thing a try, hope the neighbors don't mind..
Trending Topics
Transmission Rebuilder
Joined: Jul 2008
Posts: 1,570
Likes: 63
From: North Georgia
Sure I have had them throw a code, but not all of the time, especially if they are intermittent.
Some misfire codes can be difficult to get with the basic scanner.
When you say "They only last about a quarter second, but they'll pulsate pretty fast (twice a second)" do you mean twice a second for only one second now and then, or for many seconds like running over the warning strip on the highway?
Some misfire codes can be difficult to get with the basic scanner.
When you say "They only last about a quarter second, but they'll pulsate pretty fast (twice a second)" do you mean twice a second for only one second now and then, or for many seconds like running over the warning strip on the highway?
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Thread Starter
|
New User
Joined: Oct 2006
Posts: 20
Likes: 0
like running over a warning strip. They last for several seconds at a time, and pulsate very rapidly. I tried the power breaking thing and I felt it then too, looks like I'll be pulling some spark plugs tomorrow
Transmission Rebuilder
Joined: Jul 2008
Posts: 1,570
Likes: 63
From: North Georgia
Sorry for misunderstanding.
If it feels like the warning strip then I would lean more towards the torque converter shuddering in lock up, sorry.
The other problem is that you wont duplicate it sitting still power braking, that's not the converter!
Most of the time changing the fluid will fix the shudder, if not I would try some additive like shudder fix or lube guard. Sometimes replacing the converter is necessary.
If it feels like the warning strip then I would lean more towards the torque converter shuddering in lock up, sorry.
The other problem is that you wont duplicate it sitting still power braking, that's not the converter!
Most of the time changing the fluid will fix the shudder, if not I would try some additive like shudder fix or lube guard. Sometimes replacing the converter is necessary.
