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Dodge Dakota
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3/21/2007
19:00:31
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 Subject: Ring Gear burn?
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2000 4.7 auto - 9.25 rear. I popped off the diff cover and the ring gear has burn (temper?) marks at the bottom of all the gear cuts. All blue, looks consistent thru out. I'm assuming it's just normal, but I don't know.
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OBIO3
Dodge Dakota
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3/21/2007
21:24:03
| RE: Ring Gear burn?
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Message:
Diff grease must smell burnt also. Something is wrong in there that caused this.Low lube, Bad bearing, miss adjusted, bent housing and I'm probably forgetting some. The gears should be very smooth with the shiny wear areas centered on the teeth of both ring and pinion. With your teeth being burned blue, the temper is now gone at best. Find the problem. Fix it and replace the gears. Almost without a doubt, the gears were run with no gear lube.
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QQQ
Dodge Dakota
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3/22/2007
08:05:57
| RE: Ring Gear burn?
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The teeth are shiny its just the very bottom blue. I haven't had any problems, noise with it. The teeth show no wear that I can see.
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Dodge Dakota
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3/22/2007
08:56:41
| RE: Ring Gear burn?
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I don't know how they look after initial manufacture, What I see on the net is that they are all clean. But it looks almost to be from initial manufacturing. Just the extreme bottom, between the teeth, blued up. Very uniform. I was wondering if it's just normal to have that blue down there.
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Rustywrenches
Dodge Dakota
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3/22/2007
09:35:54
| RE: Ring Gear burn?
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If its not making noise etc, refill with gear lube and run it!
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????
Dodge Dakota
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3/22/2007
10:56:22
| RE: Ring Gear burn?
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Message:
Sounds like he is looking at the factory heat treating of the ringgear. If it was truely "burnt"-it would have failed by now. Fill it and run it.
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QQQ
Dodge Dakota
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3/22/2007
11:21:47
| RE: Ring Gear burn?
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Message:
I guess its ok. I refilled it the other day and seen it. Never seen a ring gear before. Just kind of worried as I'm having the wheel bearings replaced and didn't want the surprise of "your gear is burnt" give us money. I popped it open to eyeball for damage, retaining clips, metal. All clean. It probably is from the factory, they just didn't "clean" down there.
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Super bee
GenI
3/23/2007
00:06:06
| RE: Ring Gear burn?
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Message:
to turn a a gear blue like that requires A LOT of heat
heat produced by say an induction heat treater
you are looking at the heat traces left behind by the heat treating. the gear remains shiny because it is lapped and dround, or shaved, or whatever process they finish them with after it is treated
1990 sport RC SB, 1995 318drivetrain, 3.92 gears (came with truck) Powertrax "traction system", 95 dash/steering wheel, hearthrob exhaust, headers, cutout after y-pipe, necessary electric fan add-a-leafs, 30x9.5 mud tires, cranked T-bars, AR 39 15x8 rims, grill guard, roll bars
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