XL Drivetrain Parts Question

Posted: Fri Jul 11, 2008 10:56 am Post subject: XL Drivetrain Parts Question

does the new xl diff come with the hard metal cut ring and pinion gears like the hpi upgrade 86922 ?

http://www3.towerhobbies.com/cgi-bin/wti0001p?&W=000295952&I=LXTSY7&P=K

when using the xl diff, i will need the xl dogbones (ball end slightly larger dia), but i don't want to use the xl axles, because of the extended length. what normal length axle will fit the xl dogbone?
the only solution i came up with is, install x ss diff shafts onto the xl diff, but i really want to us the xl dogbones.

Posted: Fri Jul 11, 2008 11:46 am Post subject: Re: XL Drivetrain Parts Question

Get HPI #86928. It is the new super duty axle with the larger cups but in standard length.

$16 a pair. I use them on my SS with the new XL bones.

Posted: Fri Jul 11, 2008 11:54 am Post subject: Re: XL Drivetrain Parts Question

thanks, thats exactly what i was looking for. still courious to know if the xl diff has the hard cut ring and pinion gears?

Posted: Fri Jul 11, 2008 12:27 pm Post subject: Re: XL Drivetrain Parts Question

Sorry, forgot about that part. Yes, the optional hardened R&P are standard on the XL diffs.

Posted: Fri Jul 11, 2008 1:11 pm Post subject: Re: XL Drivetrain Parts Question

Even with the heavy duty ring and pinion gears, you'll still need to shim the diffs if you want them to hold up.

Posted: Fri Jul 11, 2008 4:29 pm Post subject: Re: XL Drivetrain Parts Question

i've never shimmed a diff before, but i can do a little reading and try it and while i'm there try some diff oil.

Posted: Fri Jul 11, 2008 4:37 pm Post subject: Re: XL Drivetrain Parts Question

It is a rather simple process, one that is almost impossible to screw up if you are patient. Look for a thread written by sicj for a detailed breakdown.

2 years ago I would have suggested aluminum diff housings (not cups) also, but after running plastic X housings for several gallons, they seem to be solid enough to prevent the distortion that hindered the durability of the original savage differentials in the long term.


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