70mph + Vibration Help - At the end of my rope!
Recovery Vehicle
Joined: Oct 2010
Posts: 1,037
Likes: 8
From: NNJ
Thanks for all the input. I know I have a collapsed/broken LF spring and hope that might help. I'm running stock 18" wheels with a regular balance, I work for a chain of tire and auto shops so I can always have them checked. As far as I know the wheels aren't bent...
I'm going to pull each drive shaft and go for a test drive, I've checked to see if the rear driveshaft had any weights missing and still see the stock Rover stuff but one never knows.
Keeping my fingers crossed it's just a drive shaft!
I'm going to pull each drive shaft and go for a test drive, I've checked to see if the rear driveshaft had any weights missing and still see the stock Rover stuff but one never knows.
Keeping my fingers crossed it's just a drive shaft!
Mudding
Joined: Feb 2020
Posts: 244
Likes: 87
Hi. Was there any resolution to this?
I have the same exact issue. Before my truck with a 3" lift was smooth as glass. The centering ball on my GBR HD front shaft broke one day and made an awful crunch sound. It didn't separate though. While that was out for repair I decided to add GBR 4.43 diffs with Detroit Tru tracs.
When I got the truck back it had the high frequency vibration at 70 mph.
Took the front shaft out and locked the diff and it's smooth as glass. I had a reputable shop balance the shaft twice. They swear it's good. I even went as far as getting another brand new shaft to try. Same issue.
So far I have changed:
transfer case output bearing
Transfer case front flange
Front diff flange
Truck has 69k miles and engine and trans mounts look new.
Could it be the Gbr front diff?
Edit: I also swapped out front rh hub with one from eBay while I had the diffs swapped to 4.43. Has anyone had quality issues with random hubs off eBay?
HELP
I have the same exact issue. Before my truck with a 3" lift was smooth as glass. The centering ball on my GBR HD front shaft broke one day and made an awful crunch sound. It didn't separate though. While that was out for repair I decided to add GBR 4.43 diffs with Detroit Tru tracs.
When I got the truck back it had the high frequency vibration at 70 mph.
Took the front shaft out and locked the diff and it's smooth as glass. I had a reputable shop balance the shaft twice. They swear it's good. I even went as far as getting another brand new shaft to try. Same issue.
So far I have changed:
transfer case output bearing
Transfer case front flange
Front diff flange
Truck has 69k miles and engine and trans mounts look new.
Could it be the Gbr front diff?
Edit: I also swapped out front rh hub with one from eBay while I had the diffs swapped to 4.43. Has anyone had quality issues with random hubs off eBay?
HELP
Last edited by Boostle; Sep 18, 2021 at 10:41 AM.
I'd lock the diff and remove the remove the rear shaft and only run the front - to rule out the rear shaft. Tires balanced? Ebay hubs can be ok, i'm on 30k+ on a set i got from ebay and they are holding up. Does the vibration still happen when at speed but the truck in neutral?
Mudding
Joined: Feb 2020
Posts: 244
Likes: 87
I'd lock the diff and remove the remove the rear shaft and only run the front - to rule out the rear shaft. Tires balanced? Ebay hubs can be ok, i'm on 30k+ on a set i got from ebay and they are holding up. Does the vibration still happen when at speed but the truck in neutral?
Does not feel like tire issue. It's a high frequency buzzing/vibration like I'm driving over rumble strips.
Vibration still happens with truck in neutral. Steering wheel does not shimmy like when a tire is out of balance.
Mudding
Joined: Feb 2020
Posts: 244
Likes: 87
I'd lock the diff and remove the remove the rear shaft and only run the front - to rule out the rear shaft. Tires balanced? Ebay hubs can be ok, i'm on 30k+ on a set i got from ebay and they are holding up. Does the vibration still happen when at speed but the truck in neutral?
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