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The differential gasket doesn't fit perfectly.

  

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I've ordered the gasket online. It has the correct size but the holes don't fit. May I still use it while making new holes to make it fit to the bolts?

It's a 07 Ford Crown Victoria Police Interceptor.


7 Answers
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I would just get the correct gasket.


Yes but it would take one week and I'd prefer to do it tomorrow because I plan a trip on next week.


Maybe a local Ford dealer would have one in stock?


Possible but it's a bit far away.


Another possibility would be this stuff (a lot of vehicles use RTV instead of a gasket for that):



I see. If I would use that gasket, would it leak?


I have no way of knowing, but I've owned vehicles that used RTV instead of a gasket for the diff cover and had no problems. However none of them has been a Ford Crown Vic.


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Posted by: @chucktobias

I have no way of knowing, but I've owned vehicles that used RTV instead of a gasket for the diff cover and had no problems. However none of them has been a Ford Crown Vic.

As long as you ensure that the mating surfaces are 100% clean, using rubbing alcohol as the final step, it should be fine. I feel sorry for you next time you need to replace that thing, though. Next time, maybe order your parts ahead of time. Make sure it's a US company, and made in the USA? I'd recommend Fel-Pro. I always verify my parts will fit before I start working. 


My Jeep Cherokee uses RTV for the differential covers. It looked like such a pain cleaning off the old RTV from the rear cover that I just bought a new one instead! As far as leaks though, no problems.


Yeah, lol. I bought a rear differential cover for my 1999 Ranger around 18 months ago, the original one had a small rust hole eaten into it, so I just replaced the whole thing.


It is Fel-Pro that I bought on RockAuto. The holes don't match to the bolts


That's interesting. Maybe they miscut the holes? I
Did you verify all of the other parts fit? I have a '79 Pontiac as well, only two axle sizes existed back then, either a 7.5" or an 8.5", and there was only one size on the 7.5", the rest were all 8.5". Low and behold, it was the 7.5" differential, and I had to take it back to order one off of RockAuto.


The label says: Ford Products Engine 1978-85
I received the wrong part.


Have you tried shopping at an AutoZone? Those old Crown Vic police interceptors are still everywhere.


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Posted by: @bob81

it would take one week and I'd prefer to do it tomorrow because I plan a trip on next week.

Since you'd like to get this done, just use a tube of the Permatex RTV ultra black. Wouldn't use a gasket full of holes, sort of defeats the purpose.

 

 


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Posted by: @bob81

Yes but it would take one week

If you get it online, yeah. But it should be a really common item. Just call around to all the part dealers in your area.


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Posted by: @chucktobias

It looked like such a pain cleaning off the old RTV from the rear cover that I just bought a new one instead!

this is my biggest problem with gasket maker. That and you have to wait before final torquing. I've also seen bits of it squeeze out, clog up filters and ruin engines/transmissions (not that it's an issue with axles).


I still have some spare silicone for isolating windows. May I use it or does it really have to be RTV? I used that also for sealing a damaged brake line on the ABS pump and works great. I never had any issue.


lol no don't use window caulking. I'm sure it "works great". I'm never riding in the car with you 😆


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Posted by: @bob81

I still have some spare silicone for isolating windows. May I use it or does it really have to be RTV?

No don't use window sealant. The acidic nature requires a different compound. Use the RTV black as that's what it was made for.. BTW, @mmj is right about calling local suppliers, you should be able to find that gasket locally.


*Ultra black, not black


Braking fluid is also corrosive but window sealant did well so far...


I much prefer a standard gasket.. does your diff have 1 hole at top middle or 2 holes, 1 on either side of top middle?


he means most silicones are acid curing.


1
Posted by: @bob81

I still have some spare silicone for isolating windows. May I use it or does it really have to be RTV? I used that also for sealing a damaged brake line on the ABS pump and works great. I never had any issue.

"Used silicone on a break line at the ABS pump" .. Well it was bound to happen, but this is definitely the first time I've ever heard one like this.. using a window sealant on a brake line! 😆  


you should have seen the guy we had who used jbweld to attach the wheels to his car


someone actually thought jbweld would hold wheels on? omg ....


@hixster - If you want to see some real scary stuff watch the "Just Rolled In" youtube channel.


After years of being a FB hater I finally joined Sept '22 . The last couple of months I've notice several video clips popping up, perhaps it's from them? A mechanic says, "customer states car won't move" and then shows disconnected drive shaft resting on his concrete shop floor. I thought they were 'fake' like scripted or something, are they real? It's not 'made up' or scripted ?

I just checked the YT site, hilarious indeed, thank you @chucktobias !


@chucktobias Though I am a novice DIY’er, after watching the ‘Just Rolled In’ videos for the past 30 minutes, I feel like an automotive genius. 🤓Thanks for sharing.


They're real! and these people share the road with us. And they post in our forum.


@avalon04 haha I'm a regular ASE mechanic compared to those people


@imperator Oh, I think that you are much more than ASE Certified! 😆


professor of autology?


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