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Discussion Starter #1 (Edited)
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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Discussion Starter #2 (Edited)
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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Discussion Starter #6 (Edited)
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. :thumbsup:
 

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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. :thumbsup:
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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Discussion Starter #8
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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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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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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Discussion Starter #12
Maybe a difference in the iron vs. aluminum housings......
That's what I was thinking, and...

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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I'll test fit mine tonight and let you all know if my E cover fits my iron case t-lok
 

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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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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!
 

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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!
Did your Lincoln come with an Aluminum housing with the E9 cover ???

Marks came with 3.07 gears.
 

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Yes it was the factory aluminum open 8.8 3.08 rear differential with an E9 cover
 

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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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