Axle Flange Gaskets - Do You Use ?

MIDNIGHT RIDER

Full Access Member
Joined
Sep 29, 2005
Posts
4,702
Reaction score
140
Full Floating Axle Flange Gaskets



For Dana 70 (and possibly several others as the axle flange can't be any larger than the center of a 8-on-6-1/2 wheel regardless of how big the rest of it may be):
Fel-Pro 55328 --- Victor Reinz 326212



QUESTION = Do you use a flange gasket or do you omit the gasket and only use a sealant; and, what are your observations and experiences on this ?



For years and years, on countless floating axles, I only ever used NO GASKET and apply a bead of silicone; I never ever had a leak nor any other problems.



Then, ten or so years ago, on my F-350, for whatever reason and I have no idea just what possessed me to do this, I got a brand-new pair of those hard plastic flange gaskets.



Gaskets are supposed to prevent leaks, right ?



At first, figuring the gaskets would do their job of preventing leaks and wanting to get away from the mess of using silicone, I tried just the gaskets alone, under proper 90-ft-lbs torque.



They leaked like a sieve, slinging droplets all around the inside of my simulators.



So, like an idiot, instead of ditching the gaskets and going back to my tried and true silicone only method; what did I do --- I applied a bead of silicone to BOTH sides of the gasket --- it never dawned on me that this was taking twice the silicone that I used to use.



The last few times, instead of silicone, I have been using and much prefer Mr. Gasket Form-a-Gasket #2 Non-hardening Sealer.



And then, last night, after I struggled to squish out enough Mr. Gasket to make it the rest of the way around the second side of the gasket, slid the axle home, and torqued the bolts, I made an executive decision = from this day forward, no more axle flange gaskets for me.



As I ponder upon this, I am wondering if possibly (and probably) the axle flange gaskets might not have caused another issue I was having.



In all the years and all the many many floating axles, I had NEVER had an axle bolt to loosen, let alone back out and disappear completely.



Whether the gaskets had anything to do with it or not, a few years ago, after I started using the gaskets, I came home from a trip and noticed specks of lube spattered inside my wheels.



Then, I noticed one axle bolt completely gone.



I checked that side and found I could easily turn every bolt at least half-a-turn - with my fingers.



I went around to the other side; and, although no bolts were missing, every bolt head had an eighth between it and the flange; well, between the lock-washer behind the bolt and the flange.



I replaced the missing bolt and torqued all of them and a few weeks later found them loose again.



After that, I keep the socket, extension, and long breaker-bar handy and check them regularly while I have nightmares of an axle sliding out and going off in some deep kudzu holler never to be seen again and stranding me thouwzands of miles from home.



I can't help but wonder if that plastic gasket might not be shrinking in thickness and allowing enough slack for the bolts to begin loosening.
 

Kevin 007

Full-floater
Joined
Mar 14, 2011
Posts
1,992
Reaction score
262
Location
Nelson BC Canada
If I have some, i'll use them. But ended up using RTV more times over using a gasket, due to unexpected need to pull axles, without having new gaskets on hand first. Never had an issue either way.
 

u2slow

bilge rat
Joined
May 8, 2007
Posts
1,960
Reaction score
951
Location
Coastal BC
I use the thin steel shim gaskets (reusable) and ultra-black RTV (thin coat both sides) and have no issues.

Edit: should be a spicer 39697 or felpro 55328
 
Last edited:

MIDNIGHT RIDER

Full Access Member
Joined
Sep 29, 2005
Posts
4,702
Reaction score
140
I use the thin steel shim gaskets (reusable) and ultra-black RTV (thin coat both sides) and have no issues.

Edit: should be a spicer 39697 or felpro 55328

I thought the hard plastic Fel-Pro 55328 that I have were plastic, not thin steel; maybe they are steel and just look and act like plastic.

I wish I had known about this when I had that one off last night; I would have given it the magnet test.
 

Cubey

Van dweller
Joined
Oct 18, 2017
Posts
4,333
Reaction score
1,730
Location
USA
I used the metal gasket with ultra black RTV on both sides of it. Worked great. Follow the instructions of the RTV, it needs to set hand tightened before being torqued, as I recall. and if possible, wait 24 hours to before refilling the differential if it's low.
 

XOLATEM

Full Access Member
Joined
May 5, 2023
Posts
765
Reaction score
966
Location
Virginia... in the brambles
Thanks for reminding me to check mine...I'll do it in the morning...I did notice some loose bolts a while ago...before I put on some wheel covers...

Thanks for the torque spec, too...

I used the gaskets...can't remember if I used ultra black...
 

Forum statistics

Threads
91,621
Posts
1,135,652
Members
24,377
Latest member
Emsbau

Members online

Top