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post #1 of 24 (permalink) Old 04-29-2010, 08:43 PM Thread Starter
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Different diff covers

Not sure if anyone ran into this yet. I got a replacement spare diff cover for my aluminum Mark 8 pumpkin....and found it didn't fit. Seems it's not deep enough; something actually holds the cover away from sealing it all up.
So I'm trying to track down info about if the replacement cover came from a cast iron pumpkin or something and maybe that's the only difference.

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Last edited by 94 Thunderbird XX; 05-02-2010 at 03:52 PM.
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post #2 of 24 (permalink) Old 04-29-2010, 08:52 PM Thread Starter
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Oh yeah.....while some obvious visual differences can be seen, more importantly the F cover for some reason actually is deeper than the E cover.
Can anyone add as to why? E cover belongs on the cast iron pumpkin only? I don't have the cast iron one out to compare side by side with the Mark 8 aluminum one.

My cover:



Other cover:

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Last edited by 94 Thunderbird XX; 04-29-2010 at 09:09 PM. Reason: Pics are pretty darn big, aren't they?
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post #3 of 24 (permalink) Old 04-29-2010, 09:02 PM
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I don't see the pics. The LPW unit fits great and is the lowest cost one I have seen.
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post #4 of 24 (permalink) Old 04-29-2010, 09:10 PM Thread Starter
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Quote:
Originally Posted by dirtyd0g View Post
I don't see the pics.
Fixed that...was trying to resize them down some. No luck there. lol

What's an LPW cover? Aftermarket?

And how in the heck did I pull off a New Thread twice?! Mods, please delete the erroneous copy thread.

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Last edited by 94 Thunderbird XX; 04-29-2010 at 09:17 PM.
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post #5 of 24 (permalink) Old 04-29-2010, 10:46 PM
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The E cover has to be 89-90 I have seen one before, you need the newer cover. Yes the LPW is aftermarket.
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post #6 of 24 (permalink) Old 04-30-2010, 05:47 PM Thread Starter
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Quote:
Originally Posted by dirtyd0g View Post
The E cover has to be 89-90 I have seen one before, you need the newer cover. Yes the LPW is aftermarket.
Alan
Thanks, Alan. The E cover actually hits right by where the drain/fill plug is because the cover is too shallow.

Good heads-up info for whoever might need it later on.

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Last edited by 94 Thunderbird XX; 05-02-2010 at 03:54 PM.
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post #7 of 24 (permalink) Old 04-30-2010, 06:42 PM
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Quote:
Originally Posted by 94 Thunderbird XX View Post
Thanks, Alan. The E cover actually hits the TL carrier (not the ring gear as I previously thought) right where the drain/fill plug is because the cover is too shallow.

Good heads-up info for whoever might need it later on.
So bottom line, you can't use an "E" cover with a Track Lok carrier? But the "E" cover works fine with the Open carrier? Is that what this all boils down to?
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post #8 of 24 (permalink) Old 04-30-2010, 10:03 PM Thread Starter
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Quote:
Originally Posted by NetKeym View Post
So bottom line, you can't use an "E" cover with a Track Lok carrier? But the "E" cover works fine with the Open carrier? Is that what this all boils down to?
That's an idea I didn't even consider. Might be a good call, but I'm not sure; I don't have an open carrier'd pumpkin available for me to check it out and compare....just stating what's going on at my end of it.

I think I might still have an open carrier lying about somewhere. If I do I could get a measurement of its diameter to compare with the TL one, but that won't happen for a few day from now and someone more knowledgable should get to it before I can.

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post #9 of 24 (permalink) Old 05-02-2010, 06:57 AM
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This sucks to learn lol I pulled the webbed E cover off of my 93 mark in hopes to replace the broken cover on my 95 trac-lok unit, even painted it lol, probably should have test fitted it first ... Doh!

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post #10 of 24 (permalink) Old 05-02-2010, 02:16 PM
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I've got trac lok with the E9 cover

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post #11 of 24 (permalink) Old 05-02-2010, 03:14 PM
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Maybe a difference in the iron vs. aluminum housings.

I have a 93 Aluminum Mark rear diff with an F3 rear cover - Trac lok from a SC inside, fits great.

Also have a stock 95 Mark diff with an F5 cover - has different reinforcement webbing on the cover.

And my 94 SC Iron diff has an E9 cover.
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post #12 of 24 (permalink) Old 05-02-2010, 03:52 PM Thread Starter
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Quote:
Originally Posted by SCTbird1994 View Post
Maybe a difference in the iron vs. aluminum housings......
That's what I was thinking, and...

Quote:
Originally Posted by SCTbird1994 View Post
Also have a stock 95 Mark diff with an F5 cover - has different reinforcement webbing on the cover.
And my 94 SC Iron diff has an E9 cover.
......I think perhaps that's evidence enough?

Ok, for the record the cover not fitting has nothing to do with the carrier size. What is actually happening here is that the vent area contacts the head of the carrier cap top bolt. (Went back and corrected my previous theories on why it wasn't fitting)
Again, another pair of pics to compare the difference:

E cover:


F cover:


The difference can be clearly seen that the E cover vent area is nearly flush with the flange while the F cover has that area recessed back to allow the clearance needed.

Unless proven otherwise, I could just stick with the E cover/cast iron and F cover/aluminum theory. I can't see another reason why the covers would be cast at a different depth, and it seems to make sense to say "the F cover will fit both cast iron and aluminum pumpkins while the E cover is for the cast iron pumpkin only."

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post #13 of 24 (permalink) Old 05-02-2010, 04:04 PM
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That makes the most sense. E cover=cast iron only, F3 and F5 cover fit either.
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post #14 of 24 (permalink) Old 05-02-2010, 05:24 PM
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I'll test fit mine tonight and let you all know if my E cover fits my iron case t-lok

-1996 Pearl White Thunderbird 4.6 Sport 4v with many mods:
Current Best: 13.583 @ 103.74 10/2014.
227hp/241tq measured on calibrated mustang dyno, tested at full vehicle simulation with inertia enabled, no number skewing.
-2001 White Ford F-250 Super Duty 6.8 V10, 4-door, 4x4, Limo Tint, BFG KO2's, Bilstein 7100 Remote Reservoir Race Bypass Shocks, 6" Spring lift, Kenwood Double Din, K&N Intake, FlowMaster Exhaust
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post #15 of 24 (permalink) Old 05-02-2010, 06:52 PM
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The "E9" cover only fits the iron housings. If you have an aluminum housing, you have to use an "F3" or later cover.
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post #16 of 24 (permalink) Old 05-02-2010, 07:44 PM
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My e9 cover came off of my 93 Lincoln with factory 3.08 open gears. It fits fine on my cast iron rear diff and rebuilt t-lok out of a 95 thunderbird supercoupe. Yay!

-1996 Pearl White Thunderbird 4.6 Sport 4v with many mods:
Current Best: 13.583 @ 103.74 10/2014.
227hp/241tq measured on calibrated mustang dyno, tested at full vehicle simulation with inertia enabled, no number skewing.
-2001 White Ford F-250 Super Duty 6.8 V10, 4-door, 4x4, Limo Tint, BFG KO2's, Bilstein 7100 Remote Reservoir Race Bypass Shocks, 6" Spring lift, Kenwood Double Din, K&N Intake, FlowMaster Exhaust
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post #17 of 24 (permalink) Old 05-02-2010, 09:42 PM Thread Starter
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Quote:
Originally Posted by Chris_Murder View Post
My e9 cover came off of my 93 Lincoln with factory 3.08 open gears. It fits fine on my cast iron rear diff and rebuilt t-lok out of a 95 thunderbird supercoupe. Yay!
Felt that sigh of relief all the way over here!

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post #18 of 24 (permalink) Old 05-02-2010, 11:43 PM
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Quote:
Originally Posted by Chris_Murder View Post
My e9 cover came off of my 93 Lincoln with factory 3.08 open gears. It fits fine on my cast iron rear diff and rebuilt t-lok out of a 95 thunderbird supercoupe. Yay!
Did your Lincoln come with an Aluminum housing with the E9 cover ???

Marks came with 3.07 gears.
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post #19 of 24 (permalink) Old 05-02-2010, 11:45 PM
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Yes it was the factory aluminum open 8.8 3.08 rear differential with an E9 cover

-1996 Pearl White Thunderbird 4.6 Sport 4v with many mods:
Current Best: 13.583 @ 103.74 10/2014.
227hp/241tq measured on calibrated mustang dyno, tested at full vehicle simulation with inertia enabled, no number skewing.
-2001 White Ford F-250 Super Duty 6.8 V10, 4-door, 4x4, Limo Tint, BFG KO2's, Bilstein 7100 Remote Reservoir Race Bypass Shocks, 6" Spring lift, Kenwood Double Din, K&N Intake, FlowMaster Exhaust
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-2005 White GMC Sierra 3500 6.6 Duramax, Dually, 4-door, 4x4, Limo Tint, BFG Commercial T/A's, Rancho RS9000XL Shocks, Kenwood Double Din, K&N Intake, Banks Monster Exhaust
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post #20 of 24 (permalink) Old 05-06-2010, 06:46 PM
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Another good option in addition to the LPW cover for aftermarket is the Atomic Performance IRS cover/girdle. I had one in my car and loved it. It's a shame these LPW and AP covers are hidden under the car as they look great too

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post #21 of 24 (permalink) Old 05-31-2010, 01:57 PM Thread Starter
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Quote:
Originally Posted by 94 Thunderbird XX View Post
Unless proven otherwise, I could just stick with the E cover/cast iron and F cover/aluminum theory.
So much for that.

My stock iron diff (3.08 open) has the exact same F4 cover as the aluminum Mark8 diff I have.

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post #22 of 24 (permalink) Old 08-26-2012, 10:34 AM Thread Starter
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An Update better late than never.

Could it be the difference is the distance from the pumpkin's cover flange to the axle centerline?

A shorter distance here means the bearing cap bolts won't allow the shallow cover to seat.
The complete housings still keep the same overall external dimensions. What changes is where it splits between the pumpkin and the cover. Some will have a deeper "skirt" around the gearset, carrier, and bearing caps due to the longer measurement from axle cl to cover flange. Both covers will work here. The housings with the shorter "skirt" around can only accept the deep cover.
Still trying to prove it. lol

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Last edited by 94 Thunderbird XX; 08-29-2012 at 07:12 PM.
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post #23 of 24 (permalink) Old 08-26-2012, 10:39 PM
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Ok my interest is sparked and decided to pull my old pumpkin casing (with the E9 cover)out for a few measurements.

Surely a few others here have a spare case like this to take measurements on as well to see what the differences are. The "skirt" is pretty shallow on mine. Any more than 3/16" deeper it will cut into the halfshaft seal bores.



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post #24 of 24 (permalink) Old 08-29-2012, 07:09 PM Thread Starter
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Argh. I have a spare iron punky in the garage, but no spare aluminum one other than the one under my car. But anyway:
E cover:


F cover:


and it shows where the interference is. My original iron came with the F cover, and so did the replacement aluminum one. Putting an E cover on either one didn't work.
Dang! Thought I had it Scooby'd out.

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Last edited by 94 Thunderbird XX; 08-29-2012 at 07:15 PM.
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