General Automotive Technical Discussion

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Ring Gear Bolts

Printed From: The Ford Torino Page
Category: Model Specific Forum
Forum Name: General Automotive Technical Discussion
Forum Description: Technical Automotive discussion of anything not specific to mid-size Ford/Merc
URL: https://forum.grantorinosport.org/forum_posts.asp?TID=19004
Printed Date: 24-March-2023 at 4:44AM
Software Version: Web Wiz Forums 12.05 - http://www.webwizforums.com

Topic: Ring Gear Bolts

Posted By: Notmikeb
Subject: Ring Gear Bolts
Date Posted: 26-July-2020 at 2:12PM

I’m installing an aftermarket limited slip in my 9 in rear and the flange that mounts the ring gear is thicker than stock necessitating a longer bolt as well as one with a smaller head to clear the “pocket” on the differential. I’ve found some grade 8 bolts that will do the trick but I’m questioning the need for washers. The differential I’m installing seems to be an aluminum shell and I want to make sure I distribute the load from the bolts well but I worry about installed height of the bolt heads and them not clearing the case. The factory bolts seem to be a shallow head and didn’t use washers BUT they had a 3/4” head as opposed to the 5/8” head I have to use with the new differential.

Do I need washers? If I run into clearance issues, I can always grind the head of the bolt down I guess but I really don’t want to do that if I can avoid it.

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-1973 Gran Torino Sport 351C 2V
-2013 F150 XLT Ecoboost
-2014 Flex SEL

Replies:

Posted By: Rockatansky
Date Posted: 26-July-2020 at 2:51PM

details, what carrier are you installing and is there no mention of suitable bolts in the destructions?

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72 GT Ute

Posted By: Notmikeb
Date Posted: 26-July-2020 at 3:22PM

it’s a Yukon Dura Grip and they suggest a 1.25” long bolt (which is what I got) but make no mention of washers. I’m probably overthinking this and they’ll be fine without washers, just loctite.

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-1973 Gran Torino Sport 351C 2V
-2013 F150 XLT Ecoboost
-2014 Flex SEL

Posted By: Rockatansky
Date Posted: 27-July-2020 at 11:11AM

looks like an Eaton style unit

https://www.yukongear.com/downloads/productsheets/dura%20grip.pdf" rel="nofollow - https://www.yukongear.com/downloads/productsheets/dura%20grip.pdf

no mention of case material, i'd really be surprised if it's alloy?

IIRC in factory Ford units the Trac-Locs use a smaller hex on the ring gear bolts than the open carriers because they're countersunk on the Trac-Locs, not on the opens. i'd source bolts that don't need modifying before taking them to a grinder, do you have a Fastenal near you?

https://www.fastenal.com/" rel="nofollow - https://www.fastenal.com/

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72 GT Ute

Posted By: Notmikeb
Date Posted: 27-July-2020 at 11:50AM

The bolts I got with the 5/8” head fit just fine without a washer. Barring any instruction otherwise I’m going to run them as is without a washer and not worry about it. Continuing my trend of overthinking this, I think I’d rather have the extra little bit of thread engagement that running without a washer provided anyway.

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-1973 Gran Torino Sport 351C 2V
-2013 F150 XLT Ecoboost
-2014 Flex SEL

Posted By: californiajohnny
Date Posted: 27-July-2020 at 1:12PM

washers usually give you a smoother torque when tightening but a ring gear has more bolts and closer than say the spread of like head bolts. so i think you'll be just fine without washers there?...

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JOHN
74 GRAN TORINO S&H CLONE
74 VETTE CUSTOM
90 S10 BLAZER 4X4 LIFTED
77 CELICA CUSTOM
75 V8 MONZA SUPERCHARGED
79 COURIER VERT. SLAMMED
75 VEGA V6 5 SPD
70 CHEV C10 P/U
68 MUSTANG FB CONVERSION