IRS Differential video

[DANW]

https://youtu.be/IqgsIUdrk9o

Here is a video I took laying under my car looking up at the drive shaft and differential with the parking brake on and Transmission in neutral. I have and IRS Torson setup all parts bought new from a vender on this forum. This is a video when then car was in go cart stage and now have over 3,000 miles on it. The excess play has always been in the back of my mind but after driving the car it seems to work fine, no clucking noise noticed. I am hoping to get it painted this winter and thought now is the time to make sure everything is correct. Does this look like something I need to look into?
Thanks Dan

[CraigS]

Mine is the same way. I hate it. I 'think' it might be louder because mine is an aluminum case. Yours al or iron?

[mike223]

I think that's about right - it's about the same as my IRS.

I think if you get them (8.8) much tighter they tend to break (ring) gears.

[DANW]

I feel better, it is all Aluminum with the Cobra IRS Axle Girdle Cover M-4033-G3. I wasn't looking forward to taking it out..
Dan

[bobl]

What you are seeing is not just ring and pinion play, but the combination of the spider gears, clutch packs, axle shafts and ring/pinion. Also, keep in mind any play other than ring/pinion backlash will be multiplied by the gear ratio when rotating the pinion like that. It seems about normal.

Bob

[DANW]

Thanks Bob for the explanation, that helps..
Dan

[CraigS]

Yep Bob that makes sense. My solid axle had similar slop when I had a TrueTrac (very similar to a Torsen) diff. I was so happy when that wore out and I went back to a standard Ford clutch type diff. Then I retrofitted the 2015 IRS and the slop is back. Uggghh.