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Old 06-18-2013, 07:38 AM   #1
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Leaking gearbox/rear diff :/

Okay so i had my mechanicget under my 90 RS to check for frame damage since it was in an accident. He didnt find any but said the gearbox was leaking as well as the rear diff.. My question is which to fix first, and what would be reccommended? Check for gasket leaks? Replace them? Any suggestion on the solution would be great. thanks.
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Old 06-18-2013, 07:39 AM   #2
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Replace them as in just get a new gearbox or rear, as opposed to trying to take them apart. Never had to do either so i dont know how bad it can get. Im assuming itll be worth it to try to repair instead of replace.
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Old 06-18-2013, 08:55 AM   #3
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Leaking from where?
Tailshaft and pinion seals?
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Old 06-18-2013, 11:38 AM   #4
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Im not 100%, i havent cleaned it up to check. He just said they were leaking. Never gave me a specific spot.
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Old 06-18-2013, 11:43 AM   #5
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Quote:
Originally Posted by Krysis1990 View Post
Im not 100%, i havent cleaned it up to check. He just said they were leaking. Never gave me a specific spot.
Makes a world of difference in repair cost "where" the leak is.
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Old 08-29-2013, 05:41 PM   #6
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We are thinking my rear leak is coming from the pinion seal? I think thats what my dad said..
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Old 08-29-2013, 06:05 PM   #7
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Quote:
Originally Posted by Krysis1990 View Post
We are thinking my rear leak is coming from the pinion seal? I think thats what my dad said..
Fairly easy to replace providing you have the right size socket and a good breaker bar to get the nut off of the u-joint yoke.
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Old 08-29-2013, 06:26 PM   #8
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Price range? And would it make sense to just replace my diff cover too if its in the air and i already have a new one?
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Old 08-29-2013, 06:28 PM   #9
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As long as it's not chrome.
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Old 08-29-2013, 06:42 PM   #10
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Is there a problem with chrome diff covers?
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Old 08-29-2013, 07:38 PM   #11
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Many people have problems with chrome covers in terms of quality, most notably that they seem to leak a lot. Also chrome covers tend to hold more heat in the differential. This is usually more of a problem in heavy duty applications, but it can't be good for any differential to hold more heat than necessary. But other than that, I think that they tend to look tacky under cars.
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Old 08-29-2013, 07:43 PM   #12
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My dad bought me a new diff cover since he knew i had a leak. We arent positive if its chrome or SS. He cant remember. I know its shiny. Thats about it.. :/
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Old 08-29-2013, 07:47 PM   #13
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Would be either steel, chromed steel, aluminum or polished aluminum. Don't believe they are available in stainless steel. Could be tho, never seen one.
Oops, edit, they are available in SS
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Old 08-29-2013, 07:48 PM   #14
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Okay.. Well mine is old regardless.. It cant really hurt to replace it right? Or should i leave this one.. I dont want to eff something up by replacing it..
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Old 08-29-2013, 07:51 PM   #15
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If it happens to be chrome. Sand the mating surface first. It will help against leaking.
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Old 08-29-2013, 07:51 PM   #16
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Just on the inside? Or sand the whole thing? In and out?
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Old 08-29-2013, 07:52 PM   #17
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Nevermind! Duh.. You said mating surface.. I missed that.. My bad. Thanks boss.
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Old 08-30-2013, 06:21 PM   #18
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I don't think you'll have an overheating problem if you use the chrome cover instead of aluminum. The factory used a steel cover. However it is true that chrome/steel doesn't displace heat as evenly and quickly as aluminum. That's one reason aluminum heads are better than steel. Either way more importantly is that the rear end is topped off with a high quality fluid. The main reason for leaks in chrome covers (differential, valve, timing, etc.) is that chrome covers are made from stamped steel which has a thinner mounting flange and less ridged then say a billet cover. Most leaks are due to improper installation. The covers are usually tightened unevenly and/or over tightened. Both of which slightly distort the mounting flange which eventually begins to leak after several heat cycles. Just make sure all mounting surfaces are cleaned and tighten the cover evenly and try not to over tighten it. I'm sure there's a torque spec, but I'd just snug it up by feel. Good luck.
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