What's a Good Replacement Rear Diff for the E-Maxx? - RC-Monster Forums

rawfuls · **What's a Good Replacement Rear Diff for the E-Maxx? -** 05.17.2009, 11:27 PM

Stripped yet another 3.3 model diff, starting to look into stronger diffs, any recommendations?

I'm low on cash... =/

nitrostarter · 05.17.2009, 11:58 PM

Maybe some LST diffs modded in....

rawfuls · 05.18.2009, 12:00 AM

=/

something like this:
http://cgi.ebay.com/Team-Losi-Afters...lenotsupported

Eh, modded as in..... I have stock bulks.

lincpimp · 05.18.2009, 12:01 AM

A 3905 emaxx diff is the strongest available that will drop in. Other options are the lst diffs and the hybrid bulks for 1/8 diffs. Or try to find some ue ultralite cases...

rawfuls · 05.18.2009, 12:03 AM

hmmmm I guess that's the way to go.

3.3 diffs...
What should I upgrade, inside the 3905, to make it as strong as possible, without completely overkilling it, or raising the bill to so high, I can only dream? :p

lincpimp · 05.18.2009, 12:07 AM

Quote:

Originally Posted by rawfuls

hmmmm I guess that's the way to go.

3.3 diffs...
What should I upgrade, inside the 3905, to make it as strong as possible, without completely overkilling it, or raising the bill to so high, I can only dream? :p

A 20 dollar 3905 diff from ebay is about as cheap as you can go. from what I can tell getting an al case for the 3905 diff is most likely the next best bet, as it will keep the ring and pinion from moving due to case flex. The 3905 diff internals look to be pretty robust, but you can always get the flm cups. Not too sure if flm make a case yet, but golden horizons do, if memory serves me correctly.

Next is the lst diff swap, but you have to change both and it will cost at least 100 bucks in parts.

rawfuls · 05.18.2009, 12:21 AM

Oh then, screw that LST :p

I love being cheap.

So, just pick up the cheapest aluminum case or is that bad too?
Any recommended.. cheap case?

lincpimp · 12:27 AM

Quote:

Originally Posted by rawfuls

Oh then, screw that LST :p

I love being cheap.

So, just pick up the cheapest aluminum case or is that bad too?
Any recommended.. cheap case?

No much choice, but I have never bought one so there may be more available now.

FLM51500 is the 3905 diff cup, they do not seem to list a case. You can also get the cup with gears, FLM51000, that can take m3 thread screws which is a good idea. Still costs 32 bucks, but if you need new ring and pinion that along with 5382x will upgrade you to a solid new emaxx style diff

rawfuls · 05.18.2009, 12:29 AM

Hmm, I'll be checking fleabay.
Hows this?
http://cgi.ebay.com/GEAR-BOX-x4_W0QQ...lenotsupported

Says it's compatible with the 4909 only (TMaxx) and not the 4908....
Que!?

Semi Pro · 05.18.2009, 01:02 AM

i have rd aluminum cases and cups on my brushless revo platinum and i havent been able to brake a diff with my 1515 2.5D on 5 cell lipo

rawfuls · 05.18.2009, 01:04 AM

LINK!

I like that..

rawfuls · 05.18.2009, 01:11 AM

http://monster.traxxas.com/showthread.php?t=460119

Says that he's rating the RDLogics (If that's what RD means..) a 3...
Gah?

lincpimp · 05.18.2009, 01:19 AM

Heres a link to the cases that accept the 3905 diffs: http://www.ghhobby.com/proddetail.php?prod=2584

rawfuls · 05.18.2009, 01:20 AM

Hmm, sounds good.
So I could just buy a set at a time, as my front diff hasn't busted a diff yet... *knock on wood*.

What diff oil do you recommend?

EDIT1:
Anyone have any experience with these?

lincpimp · 05.18.2009, 01:30 AM

Looking at the various threads, they seem to lack the info that the 3905 maxx diffs are superior in design to the 3.3 and previous diffs. They have steel inserts to keep the spider/output gears in alignment. The al diff cups mainly help by not flexing, and the flm with the 3mm bolts and modded ring gears will handle more abuse than the stock 2.8?mm bolts and plastic cups will. The cups will not help the ring and pinion gears survive. Al cases will help them survive better, as the al does not flex like the plastic stock cases do, which alters the ring and pinion mesh.

So if I was to do this I would go with the flm cup with the modded ring gear, and the golden horizons diff cases. You can do the rear first as it takes more abuse, unless you jump alot, then the front can take some abuse during landings.

So about 25 shipped for one case and around 35 bucks for the flm cup/gears. And about 15 bucks for the 3905 specific internals. 75 bucks for 1 diff... Makes the lstd diffs cheaper, if you plan to do both (as the lst ratios are different to the traxxas ratio so you have to swap both).

So you all are starting to see why I went to the lst... Diffs are stout stock, no need to fool around like this.