10 Step How-To: Shim The Differentials

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mustang_eater
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Post by mustang_eater » Fri Nov 11, 2005 10:52 pm

im braking the pinions in my twinzilla.

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Post by screaming_chankla » Mon Mar 20, 2006 2:45 pm

Anyway to make this thread a sticky?

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Post by Aerospace02 » Wed Mar 22, 2006 5:51 pm

It should be a sticky since this is such a great article. I never really thought about my diffs too much. But with how hot they get inside that plastic housing it would be a good idea to upgrade them all around.

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Post by Drzoidberg » Thu Mar 23, 2006 3:11 am

It should be a sticky since this is such a great article.


Here here!

Has helped me on more than one aoccasion. :lol:
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sicj
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Post by sicj » Mon Mar 27, 2006 12:18 am

HPI now has shims that can be used as well, little more attainable too.

HPI Part #: 86598
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Post by Euge » Wed Mar 29, 2006 2:05 pm

Do you use diff oil, & did you try aluminum diff cups & aluminum diff housing / bulk heads.

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sicj
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Post by sicj » Wed Mar 29, 2006 5:23 pm

My setup:

Nova Alum diff cups
GPM Housings
100K Oil

no need for alum bulks.
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Post by hammadown » Mon May 29, 2006 10:22 am

bringing this back to the top where it BELONGS!!!!!!!!!!!!!! :wink:

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Post by hammadown » Mon May 29, 2006 3:56 pm

......DID IT.........maximizer cups....... gpm cases.....
SHIMS used.....1 on each side of diff and 2 behind the front bearing on the pinion.
used the 13x16 shims on the pinion also :wink:......NICE,smooth and just a "TICK" of back lash :wink:

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Post by 420guambomb420 » Mon Jun 26, 2006 9:11 pm

help!! im finally stripping bevel gears, will this shim thing work on a savage x bulkhead, or do i just upgrade to an aluminum housing and shim it?
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Post by Busta » Tue Sep 12, 2006 6:15 pm

god I have read this 20 times and am still so fuggin confused!!

i cant understand why the diff needs to be apart for this to be done...what am i missing when i read this??

i bought the ofna 3,000 and 5,000 diff oil and now i see people using 50,000 and 30,000 so is this gonna be an issue?

this is my first diff build and im lost. SOMEONE PLEASE HELP!! 8O
Im sorry officer, I didnt realize that was illegal!

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sicj
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Post by sicj » Wed Sep 13, 2006 4:53 pm

Busta wrote:god I have read this 20 times and am still so fuggin confused!!

i cant understand why the diff needs to be apart for this to be done...what am i missing when i read this??


8O The answer is there if you comprehend what you read.....

Step 9 (Completion)
After you shimmed the diff cup side bearing, you have to take the diff all apart and build up the differential.
Remember that when it comes time to install the diff shaft(s) put the shim(s) on the diff shaft then slide it in. You cannot slide the shim over the diff shaft.

example
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Busta
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Post by Busta » Thu Sep 14, 2006 9:24 pm

isnt that shim gonna go all over the place if its between the shaft and the bearing?
Im sorry officer, I didnt realize that was illegal!

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Post by HPI_Savage_RC » Sat Sep 16, 2006 12:56 am

No, the shim is clamped between the bearing and the diff housing once everything is assembled.

I just figured out that my spider gears mesh better without the gasket, so after removing it, my once solid housings had large amounts of play. This allowed me to shim the ring gear closer to the pinion gear using one shim on the ring gear side and one on the diff cup side. There is now NO play in the mesh, but it still turns quite freely, with a little bit of extra "noise". No apparant binding to be seen though.
[img]http://img.photobucket.com/albums/v627/Savage_26/scsig2.jpg[/img]

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Post by TheViking » Fri Sep 22, 2006 1:16 am

So where can i get shims that will if the savage diffs? i bought some whitch didnt fit, and i dont want to do it again.

Links appreciated

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Post by HPI_Savage_RC » Sat Sep 23, 2006 12:38 am

http://www2.towerhobbies.com/cgi-bin/wt ... LXLZZ1&P=7

Just a side note - I like to shim my diffs a *little* on the tight side, this way I can break them in over a tank or two of easy driving, effectively wearing them in until they mesh is absolutely perfectly. A tight mesh will loosen up, a loose mesh will not tighten up.
[img]http://img.photobucket.com/albums/v627/Savage_26/scsig2.jpg[/img]

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Post by TheViking » Sat Sep 23, 2006 3:46 am

but what do u use on the small gears, those who sit in the middle, in a cross, they need smaller shims

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Post by Busta » Tue Sep 26, 2006 12:01 pm

sicj wrote:
Busta wrote:god I have read this 20 times and am still so fuggin confused!!

i cant understand why the diff needs to be apart for this to be done...what am i missing when i read this??


8O The answer is there if you comprehend what you read.....

Step 9 (Completion)
After you shimmed the diff cup side bearing, you have to take the diff all apart and build up the differential.
Remember that when it comes time to install the diff shaft(s) put the shim(s) on the diff shaft then slide it in. You cannot slide the shim over the diff shaft.

example
Image


I got it and man did it work good.....was a bit confused at first but after I looked close it made sense. Great post!!
Im sorry officer, I didnt realize that was illegal!

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Post by TheViking » Tue Sep 26, 2006 12:16 pm

Im sorry, but i still dont get it... Why shim that end of the diff cup?? Or is its just a way of showing size? I have done as it says in this tutorial, but only with the smallest gears, because i got the wrong diff shims(too small for the large gear).. Anyone familliar with a complete shim set for savage diffs?

The tutorial, by the way, is it correct?:
http://madmanluke.co.uk/DB2DAAEB-5F54-46A5-AB7F-35448A17CCC5/4A8E3277-D8A6-4BB2-94F7-900DD4D9C3C6.html
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Post by D-Rail » Wed Sep 27, 2006 11:41 am

I pulled my (stock) diffs apart yesterday, cleaned EVERYTHING, checked the mesh as stated in this tutorial. I didn't see it fit to shim the diffs @ this point. I only have 1- 3/4 gallons thru the truck, and I'm not "hard" on it, so maybe that's why... I dunno :?: I take really good care of my "toys", so I will be on the lookout for inconsistent mesh in the diffs in the future. I did however clean out the mucky HPI grease in the cups and replaced with (Mugen Diff Lube) #30,000 rear & #50,000 front. It made a considerate difference :!: This "How To" is GREAT though.... what a time saver for a newbie! I also used the "savage tear down guide" TBill wrote...
Cheers!

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