How to check and fill oil in a 7.5 differential?

78elk

Dragway Regular
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Mar 6, 2014
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Mountain Home Id
I scraped off the gasket, which was Black ATV gasket. I used my little body hammer and knocked out the dings on the edge. The dings looked like someone had lifted up to get the cover plate off. Instead of pushing the handle of the screwdriver towards the front. I was able to get it fairly straight. I put more black rtv bead in to use as the gasket. I bolted the cover back on. I plan to put new oil after 24 hours.
 
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red barn

Frequent Racer
Mar 5, 2007
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on a stock rear I was always told to stick your pink in through the fill hole. It should just be able to touch oil. Not sure if that is good advice...but it is what I was told many years ago
 

78elk

Dragway Regular
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Mar 6, 2014
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Thank you. I already knew that,but posted it wrong. I was use seeing the fill plug in plain sight and couldn't find it. Thank you for your response.
 

78elk

Dragway Regular
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Mar 6, 2014
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I just put the oil in the differential today. There was an even bead of the black rtv all the way around the cover. I plan to let it sit and see if it's going to leak. Then I'll put it on the road and see what happens.
 
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78elk

Dragway Regular
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Mar 6, 2014
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It leaks without starting it. So I will have to get glue and put it in. It'll be awhile before I will be able to get to it. Thanks to all for your help.
 

78elk

Dragway Regular
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Mar 6, 2014
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I took all the bolts back out of the cover on Monday. I tried to pry it off but it wouldn't come loose. I put the bolts back in. When this started it leaked a big puddle. After I cleaned it up and put the ATV on it leak smaller puddle. After Monday it's not leaking at all.
 

Killerdave8813

Dragway Regular
Jan 16, 2008
901
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Cincinnati,Ohio
Hi There,
You really should have a gasket under your differential cover, I always have as I've never found just sealer of any type adequate, if you have a standard 7.5" rear the Fel-Pro part number is RDS55072, I like to use Permetex Aviation Form-A-Gasket along with a gasket which is a thick liquid that has a brush to apply it, I use that on both sides of the gasket and have never had one leak in many years of working on cars, also the correct oil level with anything that has a side fill oil plug be it Rear Ends, Transmissions or whatever is dead even with the bottom of the fill plug hole with the vehicle level, also in fourty years of working on vehicles of many types I've never encountered a sealant that I could.t break loose by driving a couple screwdrivers, chisels or putty knives into the parting line, you just were'l trying hard enough, hope it helps!! Good Luck, KillerDave
 

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