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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

Drivetrain Shifter rattles at high speeds

  • Thread starter Thread starter ChaseRoads
  • Start date Start date May 10, 2023

ChaseRoads

do I need to lube this area?
Oct 29, 2020
220
73
38
midwestern america
May 10, 2023
#1
  • May 10, 2023
  • #1
Car details. 91 5.0 vert. Fresh tkx swap. Maybe 500 miles on swap.

When doing 65mph or above, the shifter will rattle. It’s me not enough that a hand on the shifter stops it but it’s bad enough that something definitely seems off. It does not do it while parked and reving. It does not change with the clutch in or out. I would think it’s driveshaft related.

I plan to inspect the rear u joints , and check the driveshaft marks to see if it’s 180 out. Is it possible the driveshaft is unbalanced? It’s the stock one that we swapped the yoke to use with the swap.
 

KRUISR

10 Year Member
Apr 16, 2015
1,816
925
143
May 10, 2023
#2
  • May 10, 2023
  • #2
How are your pinion and driveshaft angles?
 
Reactions: Cincylance

ChaseRoads

do I need to lube this area?
Oct 29, 2020
220
73
38
midwestern america
May 10, 2023
#3
  • May 10, 2023
  • #3
I’ve not properly measured them. The issue I’m fighting is being able to reach them. I don’t have access to a drive on lift.
 

ChaseRoads

do I need to lube this area?
Oct 29, 2020
220
73
38
midwestern america
May 10, 2023
#4
  • May 10, 2023
  • #4
I tried to reach under and use the tremec app but these numbers seem wrong. I’ll have to try again.

For the trans, the tail shaft.

Driveshaft , anywhere

And where in the diff?
 

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KRUISR

10 Year Member
Apr 16, 2015
1,816
925
143
May 10, 2023
#5
  • May 10, 2023
  • #5
You don't need a drive on lift (it does help though). Jack up the car and place jack stands under the rear axle (to load it as if on the ground) and under the front crossmember (I usually support in the space between the two lower control arm mounts).

The rear can get measured on the flange where the driveshaft bolts to. From my understanding you don't want the angle at each u-joint any more than 3 degrees, any more and vibration will occur at higher speeds.

I found this calculator and site helpful.

Spicer Driveline Operating Angle Calculator

Measure the angles of each component in your drivetrain, then use the Spicer Driveline Operating Angle Calculator to find the operating angle of each u-joint in your drivetrain.
spicerparts.com
 
Reactions: General karthief

limp

wrap a little cheese around it and its a done
5 Year Member
Oct 4, 2020
5,466
2,899
173
Florida
May 11, 2023
#6
  • May 11, 2023
  • #6
 
I

Imatk

Active Member
Apr 17, 2005
101
10
29
Jun 28, 2023
#7
  • Jun 28, 2023
  • #7
Check the pinion, also check the U-Joints, make sure they aren't broken/loose etc... ask me how I know
 
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