CEN Racing Differential Parts List for Savage FYI

[Gee]

I was doing some research on the CEN Racing Differentials. I like to know what it cost for an item before I start bidding on ebay items. Tower seems to have most of what is needed but when it comes to the differential case cover that goes opposite of the ring gear. All I could find was a discontinued item. I don't see anything that is listed that would replace that item. Any one familiar with these differentials that could shed some light on it for me?

Never mind.

I found the discontinued item at Cen Direct for $4.04 a peice. So I found my answer but figured I had all this down in here to ask my question. I would pass it on as an FYI.

This is what I came up with as all the items I would need to upgrade my savage to the cen diff.

Diff Case
http://www3.towerhobbies.com/cgi-bin...?&I=LXSXS2&P=Z
9t Bevel Gear
http://www3.towerhobbies.com/cgi-bin...?&I=LXSXS4&P=Z
26t Ring Gear
http://www3.towerhobbies.com/cgi-bin...?&I=LXSXU7&P=Z
Internal bevel gears
http://www3.towerhobbies.com/cgi-bin...?&I=LXSXS3&P=Z
Gaskets
http://www3.towerhobbies.com/cgi-bin...?&I=LXSXV5&P=Z
Shims
http://www3.towerhobbies.com/cgi-bin...?&I=LXSXV6&P=Z
and lastly the discontinued differential case cover
http://www3.towerhobbies.com/cgi-bin...?&I=LXSXU8&P=Z

If also uses the 8x16 bearins which I already have and the diff cups from the savage are used.

Here's the case cover at Cen Racing
http://www.cenracingdirect.com/index...h=gs203&Page=1

To build a CEN GST 7.7 differential to upgrade you savage it would cost approx. 73.61 for the parts. This is not including the 8x16 bearings used and using the savage drive cups which you drill out to fit the cen diff anyways.

To build two diffs out of new parts it is 99.99. This is also with out the drive cups and bearings. Also there should be enough shims and gaskets for two in the order of one set. The part gs001 differential case also has two cases for the one part number.

[Finnster]

You may want to get the cross pins as well. MX040 iirc...
they have a few different case covers too for whatever reason. Tower may have another that would work.

[Gdot]

I just did all this(made a bunch of converted diffs for flux) and the gs202 is NOT the right gear. You need this one: http://www.cenracingdirect.com/index...arch=GO&Page=1
The 202 has a WAY TOO BIG hole for the output cup to fit into. Unless I'm a complete retard, the thing just won't work and I have both parts here to prove to myself I'm not a retard... but that's another discussion...

So this makes the deal on Sav Central where guy selling them either in bulks and shimmed or just the diffs with shims not look too bad. His last posted prices were $130 in bulks and for the parts, silver $115 and black $110. These are filled with 10k fluid.

I didn't know these were that expensive. What do they typically go for on Ebay?? I know about the red loctite and having to bake them to get them open, so paying him may be worth all the trouble/time its going to take anyway.

[Gee]

Yeah, not too bad of a deal. If you catch the right auction you might skate by with a cen diff in the low 40's. Since I've been watching them the last couple of weeks they seem to be on an average around 55.00 a peice. I've already spent 50.00 on new 13t bevel gears and a new bulk head. It would have been a much more pleasurable experience if I would of just bought the cen diff to begin with. The bevel gear stripping has been a pia. Only had two good runs on it since I got it.

Got fed up today. Yesterday had a decent run and started to get the engine dialed in and the suspension/steering where it was controllable. Then I got home and got everything ready and three minutes into the run the front bevel stripped again. I am not doing the bad of a job shimming these guys either. I've gottens some practice lately with the strr and this guy. After this episode I tore both diffs out of it and put in the Kyosho STRR ring gear and pinion in it. They have the spiral cut on them and have held up really great in the truggy. I'll see if the can handle the weight of the savage.

[lincpimp]

Sounds like a big cost without much benefit...

Any chance a lst diff would fit (hahahaha)?

I am thinking the stock savvy diffs/pinion with the flm case/bulk combo would be preferable. I plan to do this with the big 5th scale savage build. Seems like a properly shimmed 13/43 diff in a solid al case that will not flex will be the ticket. Plus the cases are 60 bucks each, so they are not that much more expensive than the Cen diffs.

Get a set of these:
http://www.ghhobby.com/proddetail.php?prod=2618

They are 6061-T6 and have the easy access feature that FLM's lack. I have been using them with my Cen diffs and they are very well made.

[Gee]

Originally Posted by lincpimp

Sounds like a big cost without much benefit...

Any chance a lst diff would fit (hahahaha)?

I am thinking the stock savvy diffs/pinion with the flm case/bulk combo would be preferable. I plan to do this with the big 5th scale savage build. Seems like a properly shimmed 13/43 diff in a solid al case that will not flex will be the ticket. Plus the cases are 60 bucks each, so they are not that much more expensive than the Cen diffs.

What sounds like a big cost w/o benifit? Then cen diff? I haven't seen one in person but looking at these pics. http://rcbasher.com/savcendiffs.html They look stronger then the savage gears. Your gonna need something pretty strong in the 1/5 your building. You think the savage 13t bevel will handle it?

I've never has a lst diff in my hands before so I am not sure it they would fit. You are probably joking but not sure. If I had some I would try them if they are stronger. The weak part of the savage xl diffs are the 13t bevel gear. The alum differentials case/internals/ring gear are holding up. I did use a new older version of a bulk head the last time around. It may flex more then the quick access bulkhead version that I got in the mail yesterday. It is installed now with the strr differential gears.

I've looked at the FLM options and have considered that an option. Never seen the ones Electric El linked to. If flexing of the bulk is where the problem is then that seems to be another option and you could still use the savage gears. There pros and cons to both the flm and GS bulkheads which seem obvious. I just want something that is going to last longer then a couple of tanks.

The main reason I put the strr gears in was lack of replacement parts at the moment. Have another 13t ordered from a-main but that's a couple days out. I had the strr gears on hand and damit I want to run this rc! Should be interesting with the different gear ratio.

[lincpimp]

Originally Posted by Gee

What sounds like a big cost w/o benifit? Then cen diff? I haven't seen one in person but looking at these pics. http://rcbasher.com/savcendiffs.html They look stronger then the savage gears. Your gonna need something pretty strong in the 1/5 your building. You think the savage 13t bevel will handle it?

I've never has a lst diff in my hands before so I am not sure it they would fit. You are probably joking but not sure. If I had some I would try them if they are stronger. The weak part of the savage xl diffs are the 13t bevel gear. The alum differentials case/internals/ring gear are holding up. I did use a new older version of a bulk head the last time around. It may flex more then the quick access bulkhead version that I got in the mail yesterday. It is installed now with the strr differential gears.

I've looked at the FLM options and have considered that an option. Never seen the ones Electric El linked to. If flexing of the bulk is where the problem is then that seems to be another option and you could still use the savage gears. There pros and cons to both the flm and GS bulkheads which seem obvious. I just want something that is going to last longer then a couple of tanks.

The main reason I put the strr gears in was lack of replacement parts at the moment. Have another 13t ordered from a-main but that's a couple days out. I had the strr gears on hand and damit I want to run this rc! Should be interesting with the different gear ratio.

I thought you were having issues with the cen diff, whoops. And i was joking about the lst setup, as I doubt it would fit without major mods/fabricating.

I think the flm parts would be better then the GH stuff, and are cheaper too. I have no experience with either, so maybe someone who has tried both will chime in. 1/8 diffs are tough, and the machined hpi parts should be sturdy. I guess case flex is causing the issue. I should have some time this weekend to finish my savage and plan to take the diffs/bulks apart (they come assembled in the SS kit) and check everything.

The 1/5 scale will require some tough components. I will start with the hpi diff parts and upgrade if necessary.

I have both the FLM and the GH. Quality wise, they are the same. I had to send back an FLM for fitment problems. No problems with the GH ones so far. The good thing about the GH bulks is that they have the easy access feature so you don't have to rip your whole Savage apart to get to the diffs. They also will fit the new XL style larger diff cups, the FLM won't. GH also has a lifetime warranty and I have had great service from them in the past with my Baja 5B parts. The only problem is that they are made in Canada and you have to ship back there for warranty, but they do pay to ship it back to you.

[Gee]

Thanks for the info. What cups did you need to use for the FLM?

The FLM will only take the older standard size cup that is stock for the Savage 25, X, 4.6, etc.

[Gee]

Thanks. Still checking out all the options. Do you think the ring gear from the cen would fit right onto the xl cup? Just swap out the xl ring gear and 13t bevel gear for those on the cen?


I was doing some research on my above question and found a thread at savage central were a guy has been testing this in his flux. Sounds like it is holding up pretty good. Here's the link:

http://www.savage-central.com/module...&highlight=cen

I order the cen ring and bevel gears to give it a shot myself. Unfortunately I had to order them from two different places. So I got double dinged on the shipping cost. I got the two ring gears for 30.00 and the two bevel gears for 23.00. That's the cost w/o the shipping inlcuded.


Just a FYI for anyone interested. I was also looking around for a 13t beveled pinion that might hold up better then the HPI 13t does. Attached is the document with a list of possibilities. I haven't followed up on it much after I found out about the above possibility.

13t bevel gear comp.doc

Still waiting on a couple of responses on the length of the overall pinion itself.

Don't remember where I saw it but someone installed/shimmed set of the set up Cen diffs offered on SaV Central in a 6S Flux. Then he tried to break them and couldn't by just running/jumping. He finally did succeed - holding it WOT and throwing it on the ground, just took 9 tries, IIRC. It broke tooth off pinion.

He's updated the prices on Sav Central for the ready to drop in setups. They're $20 more than what I quoted above. He said he's no longer buying Ebay, but all new and thats reason for the increase.

I'm waiting on ground to get dried out (9.4" rain in 4hrs 2 days ago) and will start running 6S in my Flux and if I have trouble with diffs, I'll pop for a set of his ready to go Cen diffs.

I had diff probs with my old SS4.6 and was never able to completely fix, just made them last longer - alum bulks, alum cups, and alum diff cases. It would still kill that small brg on the ring gear every so often, but was better that stripping ring gears.

[pdcsq]

Originally Posted by Gee

I order the cen ring and bevel gears to give it a shot myself. Unfortunately I had to order them from two different places. So I got double dinged on the shipping cost. I got the two ring gears for 30.00 and the two bevel gears for 23.00. That's the cost w/o the shipping inlcuded.

What parts did you order?
GS004/GS005 or MX037/MX040 or MXS37/MXS38?

Have you installed and tested them? What's the result?