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Author
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Topic: Anyone try the poorman's limited slip in an 8.8"
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f100cleveland
Gearhead Posts: 295
From: St. James, MN
Registered: Sep 2004
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posted 10-31-2004 02:49 PM
   
I've read before that you can put an extra shim on each side of the sidegear between it and the carrier. Is that true and if so, does it really work? Thanks
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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 10-31-2004 03:29 PM
It works, but will prematurely wear out the side and spider gears.
8.8 posi units are so plentiful, I never need to do it.
I replace so many with spools or aftermarket differentials that I always have a surplus.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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f100cleveland
Gearhead Posts: 295
From: St. James, MN
Registered: Sep 2004
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posted 10-31-2004 05:14 PM
Alex, how much faster do you think it will wear them out? The sidegears and spiders should be able to be picked up pretty cheaply as long as nothing else is wore out.
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TomP
Gearhead Posts: 5761
From: Delta BC Canada
Registered: Dec 99
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posted 10-31-2004 07:25 PM
On an open diff this is very shortlived. The pieces that wear are metal, the hard bits flake off, the stuff turns the gear oil into a metal slurry and kills the bearings and gears. Use a normal 8.8 posi, put an extra clutch disc in it and it'll be plenty tight.
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Moneymaker
Administrator Posts: 25883
From: Lyons, IL, USA
Registered: May 99
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posted 10-31-2004 11:19 PM
I agree with Tomp.
You won't see more than a couple of hundred miles total if you are luckey.  ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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Richard Swart
Gearhead Posts: 134
From: Graham, Wa.
Registered: Oct 99
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posted 11-01-2004 02:24 AM
I have a 8.8 out of a 95 explorer. I herd that the the later posi is better then the early. any truth to this? thanks Richard------------------
64 Fairlane 351w thunder-nut. 68 Torino formal roof 351w. 68 cougar GTE. 70 cougar 351w aod trany.73 F-100 4x4 428 tri-power.
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Jim B
Journeyman Posts: 19
From: Chicago
Registered: Feb 2003
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posted 11-03-2004 09:50 PM
I have done this mod. You replace one of the shims between the clutch plates with another clutch plate. So instead of s/c/s/c/s/c/s you have c/s/c/s/c/s/c. This mod works and I have not experienced any "extra" wear of the spider gears. The rear end in question has 160K on it and the mod was done at about 90K. I am running a 3.55 gear on a street car. There are web site that give a full description on how to do this.
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f100cleveland
Gearhead Posts: 295
From: St. James, MN
Registered: Sep 2004
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posted 11-03-2004 10:25 PM
Jim, the mod I am referring to uses an extra shim or two on an open carrier 8.8 in-between the side gears and carrier. After hearing what can happen, I know I won't be trying it.
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mizry
Journeyman Posts: 43
From: ca
Registered: Sep 2004
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posted 11-03-2004 10:46 PM
You really cant stuff the 8.8 with enough shims to lock the spider gears like a 8 or 9 inch. You want to add shims till the side gear endplay is at the minimun, you could add an extra clutch and remove one steel plate but you can only get the gears so tight before they either wont install in the case or the pin wont fit between the axles. There is alway the low buck UNSAFE option of welding the gears.
The 8.8 clutch plates are "loaded" by the S-spring and the side gear load. adding shims will increase the contact on the side gears making them stronger.
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