Jolting at ~35mph and again around ~50mph
#1
Jolting at ~35mph and again around ~50mph
Alright folks…
2004 139k miles on truck, ~42k miles on Atlantic British rebuild
she drives strong, but around 35mph, when the speed drops below or gets above I feel a jolt of sorts in the vehicle. Best I can figure with the timing and consistency that it is related to shifting gears (automatic btw). I feel the same around 50mph, though not as intense but still noticeable every time. There’s a slight clunk that accompanies this action, but no grinding noise or anything.
from what I have read it could be
- worn motor mounts
- Clogged trans filter (no clue if it was changed by any of the PO, but also no leaking or loss of fluid)
- front prop shaft going out (non greasable currently on the truck)
- bad fuel injectors (doesn’t seem likely but someone had similar symptoms and corrected it by installing new ones)
I’m hoping for any input here…my next step is a new transmission filter, then pulling the front prop shaft if the trans filter doesn’t help. Of course I’m willing to take advice from the experts if another plan of action may be in my best interest.
i’m about a 7 out of 10 on a mechanical level. Outsourced both head gaskets to a local rover shop, but prefer to save the hourly rate when I can do the work myself.
2004 139k miles on truck, ~42k miles on Atlantic British rebuild
she drives strong, but around 35mph, when the speed drops below or gets above I feel a jolt of sorts in the vehicle. Best I can figure with the timing and consistency that it is related to shifting gears (automatic btw). I feel the same around 50mph, though not as intense but still noticeable every time. There’s a slight clunk that accompanies this action, but no grinding noise or anything.
from what I have read it could be
- worn motor mounts
- Clogged trans filter (no clue if it was changed by any of the PO, but also no leaking or loss of fluid)
- front prop shaft going out (non greasable currently on the truck)
- bad fuel injectors (doesn’t seem likely but someone had similar symptoms and corrected it by installing new ones)
I’m hoping for any input here…my next step is a new transmission filter, then pulling the front prop shaft if the trans filter doesn’t help. Of course I’m willing to take advice from the experts if another plan of action may be in my best interest.
i’m about a 7 out of 10 on a mechanical level. Outsourced both head gaskets to a local rover shop, but prefer to save the hourly rate when I can do the work myself.
#2
#3
I have also heard that removing it, locking the cdl and driving it would help rule out if it is causing the problem
#4
If the gears are shifting harshly then it may be low on fluid so you can check the transmission fluid level by running the vehicle until its at normal operating temperature and leave it running. Put on all your PPE, be careful and don't get burned during the following process! Make sure the vehicle is in park, chock the wheels and go under the vehicle; toward the front of the transmission oil pan there is a fill plug, remove it and see if a small stream of fluid comes out; if YES, its filled; if NO it needs fluid; add fluid until it starts streaming out.
#5
If the gears are shifting harshly then it may be low on fluid so you can check the transmission fluid level by running the vehicle until its at normal operating temperature and leave it running. Put on all your PPE, be careful and don't get burned during the following process! Make sure the vehicle is in park, chock the wheels and go under the vehicle; toward the front of the transmission oil pan there is a fill plug, remove it and see if a small stream of fluid comes out; if YES, its filled; if NO it needs fluid; add fluid until it starts streaming out.
was under the truck replacing o2 sensors today and figured I would double check the t fluid. Still streaming out when plug is removed at operating temp ~190 and having been driven about 10-15 minutes after o2 sensor install.
#7
This sounds similar to exactly what I’m going through right now, mine was a distinct shimmy in the steering wheel. I took out the front driveshaft (super easy, at least with the driveshaft removal socket extension) and found a u joint bearing that was demolished. Like others have said, I took it out, locked the CDL and the problem went away.
#8
Thread
Thread Starter
Forum
Replies
Last Post