Help!! Really need some expertise
07-20-2017, 11:36 PM
#1
Help!! Really need some expertise
Hey guys
I just got my first truck and chose the F150 because well...it's just the obvious choice lol On a tight budget so got a high mileage 2009 5.4 3v Triton. I love the truck, I am so shocked at the mileage it can get with normal gas with a V8!! I have a v8 M3 and that thing drinks gas.
Anyway, I just got the truck two week ago. When I test drove it, there was a very very minor 1-2 shudder when taking off and coming to a stop. Didn't think much of it but this week it's been really bad. I have read countless threads but I can't seem to get the right answer. Truck is bone stock though I do have some plans for it in the future lol
Symptoms:
When taking off from 0 (light or hard acceleration) and right when it is about to come to a complete stop, there is 5-6 shudders and it's getting more rough by the day. On acceleration, once it pass 5mph, it's completely gone and the ride is really smooth and the shifts are silky smooth. If I put it to neutral and come to a stop, there is no shudder.
I read if it shudder and gives you a kick only when you are coming to a stop, it's most likely the pinion to the rear diff, but mine happens at take off too. I then read it could be a misfire but I put it to a scan tool and i have 0 misfire on all cylinder. Then I read it could be the torque converter but it is supposed to also shudder at 45-60mph or so which I don't have. I also read the 1-2 2-1 shifts are really bad for this truck and need a reflash of the pcm, but mine 1-2 and 2-1 is also very smooth, it is literally right when I am about to come to a dead stop. Would doing a tranny flush or rear diff flush work? Anyone experienced the same problem?
Just coming back from work, I found out the night tailight lights don't work, but brake light, reverse, and signal all works. I read it could be a broken wire on top of the spare wheel, which I will check and get back.
Anything would be helpful!! Thanks guys
I just got my first truck and chose the F150 because well...it's just the obvious choice lol On a tight budget so got a high mileage 2009 5.4 3v Triton. I love the truck, I am so shocked at the mileage it can get with normal gas with a V8!! I have a v8 M3 and that thing drinks gas.
Anyway, I just got the truck two week ago. When I test drove it, there was a very very minor 1-2 shudder when taking off and coming to a stop. Didn't think much of it but this week it's been really bad. I have read countless threads but I can't seem to get the right answer. Truck is bone stock though I do have some plans for it in the future lol
Symptoms:
When taking off from 0 (light or hard acceleration) and right when it is about to come to a complete stop, there is 5-6 shudders and it's getting more rough by the day. On acceleration, once it pass 5mph, it's completely gone and the ride is really smooth and the shifts are silky smooth. If I put it to neutral and come to a stop, there is no shudder.
I read if it shudder and gives you a kick only when you are coming to a stop, it's most likely the pinion to the rear diff, but mine happens at take off too. I then read it could be a misfire but I put it to a scan tool and i have 0 misfire on all cylinder. Then I read it could be the torque converter but it is supposed to also shudder at 45-60mph or so which I don't have. I also read the 1-2 2-1 shifts are really bad for this truck and need a reflash of the pcm, but mine 1-2 and 2-1 is also very smooth, it is literally right when I am about to come to a dead stop. Would doing a tranny flush or rear diff flush work? Anyone experienced the same problem?
Just coming back from work, I found out the night tailight lights don't work, but brake light, reverse, and signal all works. I read it could be a broken wire on top of the spare wheel, which I will check and get back.
Anything would be helpful!! Thanks guys
Last edited by DarkChaos; 07-21-2017 at 12:01 AM.
07-21-2017, 12:28 AM
#2
Senior Member
The stop/start thump is almost surely what is known as slip-bump or slip yoke thump. Its an old and common problem for many makes and years of truck. The splines of the slip yoke are losing their nickel-chrome plating and getting draggy on the output shaft of the transmission (or transfer case on a 4wd). It will happen right as the truck reaches full stop and the suspension settles back to normal from its tail high stopping stance. It will happen again upon initial throttle application when the rear end squats under torque. The short term fix is to pull the driveshaft and grease the splines. My best result so far has been with copper based anti-sieze. The long term fix is replace the slip yoke. Its annoying but not damaging, so you don't HAVE to fix it right away.
The following users liked this post:
Wanted33 (07-22-2017)
07-21-2017, 08:24 PM
#3
The stop/start thump is almost surely what is known as slip-bump or slip yoke thump. Its an old and common problem for many makes and years of truck. The splines of the slip yoke are losing their nickel-chrome plating and getting draggy on the output shaft of the transmission (or transfer case on a 4wd). It will happen right as the truck reaches full stop and the suspension settles back to normal from its tail high stopping stance. It will happen again upon initial throttle application when the rear end squats under torque. The short term fix is to pull the driveshaft and grease the splines. My best result so far has been with copper based anti-sieze. The long term fix is replace the slip yoke. Its annoying but not damaging, so you don't HAVE to fix it right away.
