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

Rear end slop

  • Thread starter Thread starter Scott7512
  • Start date Start date Dec 31, 2018

Scott7512

Active Member
May 19, 2015
153
8
38
Branchland WV
Dec 31, 2018
#1
  • Dec 31, 2018
  • #1
Under the car today and it seemed like there is too much slop when turning the drive shaft. Since I am not driving the car till spring, I decided to look into it. I pulled the cover off and looked around. The backlash looks to be 18. Pattern is concave side in the middle and convex side is more towards the outside but not extreme. I would say the center of the mark is 3/4 to the outside.
When I move the wheels there is also slop in the axles where they connect to the spider gears. I can also move the smaller spider gears a bit.
I also have had a whine on coast. No whine on acceleration.
My main question right now is how much if any slop should be with the axles to the spider gears? I am thinking there should be none at the spline where the axle goes into the spider gear. These are 28 spline I think.
 

Scott7512

Active Member
May 19, 2015
153
8
38
Branchland WV
Dec 31, 2018
#2
  • Dec 31, 2018
  • #2
Sorry I did not mention it’s a 93 lx 5.0 manual. When I got it, it already had a gear swap to 373s.
 

General karthief

wonder how much it would cost to ship you a pair
5 Year Member
Aug 25, 2016
27,846
10,522
203
polk county florida
Dec 31, 2018
#3
  • Dec 31, 2018
  • #3
How many miles?
 

JD1964

there is enough sticking out to grab on to
15 Year Member
Jun 28, 2013
3,427
1,519
194
Maryland
Dec 31, 2018
#4
  • Dec 31, 2018
  • #4
There's lots of places for slop to add up. Axle splines to side gears, side gears to pinion gears, pinion gears to pinion shaft, pinion shaft to diff case, ring gear to pinion gear. Trying to judge things by moving the wheels or the pinion yoke can be misleading.
 

Scott7512

Active Member
May 19, 2015
153
8
38
Branchland WV
Jan 1, 2019
#5
  • Jan 1, 2019
  • #5
75000 miles
 

Scott7512

Active Member
May 19, 2015
153
8
38
Branchland WV
Jan 1, 2019
#6
  • Jan 1, 2019
  • #6
Also noticed that the bearing caps appear to be reversed. The arrows are pointing towards the inside. Maybe they also reversed the spacers and that increased the backlash.
I will take it apart and investigate a little more.
 

Scott7512

Active Member
May 19, 2015
153
8
38
Branchland WV
Jan 1, 2019
#7
  • Jan 1, 2019
  • #7
Drivers side spacer is .260
Passenger side is .290
 
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