8.5 S Spring Posi

dwydendorf · 06-29-2018, 11:27 AM

The original posi units were made by Eaton. I think you can still get the original type clutches through a dealer that handles the Eaton parts.
The factory clutches were broken in on a break in machine after being soaked in a pan of gear lube. You could do something similar by assembling the differential with preload plates and springs and turning the axle a half dozen times in each direction. It won't apply as much pressure to the clutches as the breakin machine did but it would be better than what you have now.

Randy Schonscheck · 06-30-2018, 11:25 PM

Sorry been gone for a while. Got things working by doing the install with lots of gear lube and then rotating it about 30 to 40 tomes in each direction, It seems like it gives it alittle breakin mode to take the "fuzz" off. Everything fit perfect. Most experts on differentials do not like synthetic lubes either on limited slip posi 's. So I'm going to give that a try too. Been using synthetics for 30 years. Anyways, thanks guys for your help and advice. Randy

06-29-2018, 11:27 AM	#1
dwydendorf Member Join Date: Jul 2006 Location: michigan Posts: 162 Likes: 251 Liked 19 Times in 7 Posts	Re: 8.5 S Spring Posi The original posi units were made by Eaton. I think you can still get the original type clutches through a dealer that handles the Eaton parts. The factory clutches were broken in on a break in machine after being soaked in a pan of gear lube. You could do something similar by assembling the differential with preload plates and springs and turning the axle a half dozen times in each direction. It won't apply as much pressure to the clutches as the breakin machine did but it would be better than what you have now. __________________ ss/gt 93 t-bird

06-30-2018, 11:25 PM	#2
Randy Schonscheck Junior Member Join Date: Feb 2002 Location: Omro, WI Posts: 64 Likes: 0 Liked 2 Times in 2 Posts	Re: 8.5 S Spring Posi Sorry been gone for a while. Got things working by doing the install with lots of gear lube and then rotating it about 30 to 40 tomes in each direction, It seems like it gives it alittle breakin mode to take the "fuzz" off. Everything fit perfect. Most experts on differentials do not like synthetic lubes either on limited slip posi 's. So I'm going to give that a try too. Been using synthetics for 30 years. Anyways, thanks guys for your help and advice. Randy

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