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Tamiya TNX 5.2R,,Rear Diff help please

Old 04-14-2010, 07:38 AM
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delorean123
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Default Tamiya TNX 5.2R,,Rear Diff help please

Hi all.....Yesterday while out entertaining the neighbour hood kids with my truck.....I snapped the rear drive shaft off...!!!
Now..Let me explain the problem..The rear diff has three outputs...2 to the rear wheels and 1 to the center....It's the 1 to the center that broke..
The shaft is fine.....So I removed the rear diff to check further......Upon inspection..I noticed that the joint cup came off with the shaft..which means that the Diff now has a busted piece of metal coming out of it....It actually snapped off inside the diff......So there is piece of metal sticking out of the rear diff,,(center)..It looks like it got so hot that it snapped..???..My question to you experts is this...Do I need a new rear diff now..??..Or can that piece be replaced..?..I have never opened up a diff ..so I'm not sure what to do..??...
If that piece can be replaced..(Looks like a joint cup with a mini shaft attached to it)...Is there an upgraded one that I can buy..??..If so..where..??
Is this a common issue with this truck..??...I have never had any previous issues..(Other then this truck loves clutch's)....
Please help guys...I need this truck back up and running A.S.A.P
Thanks in advance...
Jamie
Old 04-15-2010, 12:30 AM
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secretsg
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Default RE: Tamiya TNX 5.2R,,Rear Diff help please

Yes it can be replaced. You need to buy this http://www3.towerhobbies.com/cgi-bin...?&I=LXGYY4&P=7

There is also a Zerol gear upgrade, TAM53950 that you can buy to replace the stock pinion/ring gear in the diff.

Before you buy I would open the diff up to see if there is nothing else broken inside. The drive cup will come off after you remove the grub screw. Your manual has a parts explosion that show you exactly what you need to do.
Old 04-15-2010, 07:43 AM
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delorean123
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Default RE: Tamiya TNX 5.2R,,Rear Diff help please

Is this a direct drop in replacement..??..and is it alot stronger..??
Do you have any idea why this happened to my truck..??
Old 04-15-2010, 07:22 PM
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The Mad Modder
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Default RE: Tamiya TNX 5.2R,,Rear Diff help please

ORIGINAL: delorean123

Is this a direct drop in replacement..??..and is it alot stronger..??
Do you have any idea why this happened to my truck..??
It's the the stock tnx diff ring and pinion. This is the upgrade one.
http://www.tamiyausa.com/product/ite...oduct-id=53950
If you saw signs of heat, I would check the bearings the it rode on to make sure they aren't seized.
Old 04-16-2010, 07:30 AM
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delorean123
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Default RE: Tamiya TNX 5.2R,,Rear Diff help please

What makes it an upgrade..???
Old 04-17-2010, 08:49 PM
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Default RE: Tamiya TNX 5.2R,,Rear Diff help please

Tamiya product description: "This special type of spiral bevel gear features curving teeth for higher strength and efficiency than straight bevel gear."
Old 05-05-2010, 11:35 AM
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delorean123
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Default RE: Tamiya TNX 5.2R,,Rear Diff help please

All I can say is thanks to all who helped out........The TNX 5.2R is the Best..!!!!...I love this truck
Old 05-05-2010, 02:54 PM
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The Mad Modder
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Default RE: Tamiya TNX 5.2R,,Rear Diff help please


ORIGINAL: delorean123

All I can say is thanks to all who helped out........The TNX 5.2R is the Best..!!!!...I love this truck
Glad to help. The TNX is a sweet truck. If I ever decided to get into nitro trucks, I would get one.

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