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Old 12-18-2009, 04:52 PM   #1
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Default Welded Diffs

I'm looking to buy a car that has a welded diff and driving it nearly 4000 miles back home. Aside from the fact that I'll likely want to kill myself by the end the seller has mentioned that it's been making some noise. I'm wondering if anyone has used a welded diff that's unwelded itself and what kind of risk I'm running in this case.
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Old 12-18-2009, 05:04 PM   #2
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i welded my diff. instantly dropped 2 sec. at the auto-x, 1 sec. at track days. and put it thru hell for 1.5 years. finally broke while drifting one day. took it apart, noticed it just broke the welds, rewelded and my buddy's about to use it while he finds another lsd. i say drive it home. i daily drove my car also and had no problems except the annoying chirps it makes in parking lots.
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Old 12-18-2009, 05:05 PM   #3
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um...seriously? I bet it will work flawlessly, for years to come. A+ thread.
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Old 12-18-2009, 05:07 PM   #4
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Please tell me you are buying this car.

https://www.miataturbo.net/forum/t42115/
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Old 12-18-2009, 06:35 PM   #5
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Originally Posted by spoolin2bars View Post
i welded my diff. instantly dropped 2 sec. at the auto-x, 1 sec. at track days. and put it thru hell for 1.5 years. finally broke while drifting one day. took it apart, noticed it just broke the welds, rewelded and my buddy's about to use it while he finds another lsd. i say drive it home. i daily drove my car also and had no problems except the annoying chirps it makes in parking lots.
lulz

silly kids, welded diffs are for ****.
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Old 12-18-2009, 07:05 PM   #6
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lol ^^^
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Old 12-18-2009, 08:01 PM   #7
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I have a welded diff, but I do not drive the car much on the street. I really do not like it much on the street. It works like a charm on the dragstrip.

I have been getting a noise from one of the axle cv's (typical clicking noise), but only in turns. That might be what is going on with your car. If the rearend is humming, than it is possible that a chunk broke off somehow, and damaged the ring and pinion. If that is the case, it probably will not last long.

I have had my welded diff crack and had to redo it. I did not have damage to the ring and pinion, but there were no chunks floating around in the diff fluid.

Last edited by miata2fast; 12-18-2009 at 08:28 PM.
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Old 12-18-2009, 08:41 PM   #8
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Heh, I'm looking at a 91 with a 97 1.8 and MS with ITBs that's listed on SomethingAwful. The guy's done most of what I want already and the price is right which is why I'm considering it rather seriously. The only thing that's a bit unnerving to me is the welded diff but I plan on replacing it when I can and keeping it as a weekend car. It's in Orlando and I'm in Vancouver though so I'm thinking of making it a road trip, even knowing that the pumpkin might blow up. The question to me is how bad and what kind of failure cases there will be.

If it breaks the weld and just works as an open diff then I don't give two ***** about that. If it leaves me stranded in bum **** Nebraska though then I'll have to pack some lube along the way. Everything else seems pretty solid though.
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Old 12-18-2009, 09:27 PM   #9
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Ask the owner these questions. Can you explain to me what the noise sounds like? Did it make a noise when it was first installed, or did it just start doing it.

If the rear is suddenly making a loud humming noise from chipped or broken teeth, it will likely leave you stranded. I personally would not chance it.

If the ring an pinion was not installed correctly, it may also make a noise (softer maybe), but probably from the time it was first installed. I could not tell you how long it would last. I would suspect if you drove it 4000 miles with the incorrect gear lash or alignment, it would do permanant damage to the gears.
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Old 12-18-2009, 10:03 PM   #10
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lol ^^^
You better bring it son! lol
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Old 12-18-2009, 10:08 PM   #11
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Find a rear end for sale, even a 1.6, close to flordia. Drive it there, buy the guy a six pack and have him help you put it in. Shouldn't take more than an hour or two I one of you knows what you're doing. IMO it'd be worth the time and money for peace of mind, even if it was a pos open diff painted pink. When mine blew I could barely push it onto a dolly it was jammed up so much, FYI.
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Old 12-19-2009, 01:46 AM   #12
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Find a rear end for sale, even a 1.6, close to flordia. Drive it there, buy the guy a six pack and have him help you put it in. Shouldn't take more than an hour or two I one of you knows what you're doing. IMO it'd be worth the time and money for peace of mind, even if it was a pos open diff painted pink. When mine blew I could barely push it onto a dolly it was jammed up so much, FYI.
Amen.
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Old 12-19-2009, 04:32 AM   #13
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lulz

silly kids, welded diffs are for ****.
so are miata's but that isn't stopping any of us.
btw your roll bar copy of a style bar is awesome.
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Old 12-19-2009, 07:54 AM   #14
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Rethinking this, but not the travel and car buying part. I might go down to Orlando to see it first and if it doesn't pan out I'll have a vacation there.

That and it was drifted. *sigh*

Where else should I look for road trip worthy miatas?
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Old 12-19-2009, 09:56 AM   #15
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Quote:
Originally Posted by DragonsMaw View Post
Rethinking this, but not the travel and car buying part. I might go down to Orlando to see it first and if it doesn't pan out I'll have a vacation there.

That and it was drifted. *sigh*

Where else should I look for road trip worthy miatas?
Rubino has a car for sale in South Florida. He has it posted in this site. Pretty awsome car.
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Old 12-19-2009, 10:20 AM   #16
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Quote:
Originally Posted by curly View Post
Find a rear end for sale, even a 1.6, close to flordia. Drive it there, buy the guy a six pack and have him help you put it in. Shouldn't take more than an hour or two I one of you knows what you're doing. IMO it'd be worth the time and money for peace of mind, even if it was a pos open diff painted pink. When mine blew I could barely push it onto a dolly it was jammed up so much, FYI.
If you drive through NY (for some crazy reason) I will help you do it there
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Old 12-19-2009, 12:46 PM   #17
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Originally Posted by spoolin2bars View Post
btw your roll bar copy of a style bar is awesome.
Wow... talk about really proving your truely an asshat. Yeah, because BossFrog look at all these cars running around with eBay style bars and said "You know, we should totally copy that and make it a real rollbar". Great ******* logic there, son.
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Old 12-19-2009, 12:54 PM   #18
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If you drive it to Texas we can swap diffs. I have a 3.90 on the shelf that we can put in mine, and you can take my 1.6L 4.30, or you can buy the 3.90 LSD if you're interested.

Either way we'll get you out of here with a dependable diff.
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Old 12-19-2009, 01:35 PM   #19
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so are miata's but that isn't stopping any of us.
btw your roll bar copy of a style bar is awesome.
You = douche bag

"Hey I disagree with you, so now Im going to insult your car."
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Old 12-19-2009, 10:12 PM   #20
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Originally Posted by DragonsMaw View Post
Heh, I'm looking at a 91 with a 97 1.8 and MS with ITBs that's listed on SomethingAwful.
You're going to buy a car from a Goon? Are you nuts?
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