hb pro diff?
 

what comes with the hb pro diff if i get it from mike for $65? just wondering if it comes with any thing else cause towerhobbies as it for like $42. im a poor arse and need to save as much as i can on this truck of mine.

the ones from mike have the bearins, pinion gear, and shim i think. the ones from tower are just the diff, no pinion gear or anything.

cool tnx squee. ill have to order up a pair from mike when i get around to doing my diffs

The pro diff has a lower gearing than the other hb diff. It is 4.3 ratio verse 3.31.

The pro uses hardened gears inside the diff.

I don't think you get the shimms. just the diff, with bearings mounted and two bearings and the pinion gear.

i was typing that ratio in to the speed calc thing on the net and found something weird dont know if my be i made a mistake but with stock emaxx diffs emaxx trans in second and a 51tooth 16tooth spur an pinion with 1950 8 i came up with a rpm of 36274 and a top speed of 41 with a 5.5" tire with .5" of ballooning. but when i plugged in the 4.3 ratio hb diff i would need 24 tooth pinion to get the same top end. well theres 2 problems i see with that big of a pinion. 1 thats a lot of rotating mass for a motor to have to spin up and 2 mike doesnt even have a 24 tooth the biggest on there is 20 so how would you go about fixing this prob? obw i could be using the speed calc thing wrong to so im a little :025: just got up :027:

You are right to assume the pinion would need to be a 24 toother with the 4.3 diffs. The hb also makes the 3.31 diffs which would take abouta 18 or 19 to make it out right.

do they make the 3.31 ratio hardened as well? and can mike get um?

mike has the 3.31 ones in the store and they too are hardened http://www.rc-monster.com/proddetail...GY_DIFF&cat=47

One question. Are both the PRO and ordinary radial cut? Thanks.

Helical

:005: same difference, cheers Serum.

Will these fit straight into the E-Maxx? I keep shredding stock diffs on my HV E-Maxx :019: :031: .

No, they need a 1/8th FLM bulkless to use.

You can get aluminum cups for your hvmaxx with M3 screws. Since it's a rather weak setup, you won't be needing the 1/8th

You might as well consider getting the new differential cases from the T-maxx 3.3 it uses 4 instead of 2 screws. (traxxas 4980X)

I seen the ones with the 3MM screws, the stock screws in the nova diff cups we had went walkies! Will def. look into it.

Thanks

will a mip drive cup work on the pinion gear?

I dont see why not.

I am not sure which pinion gear you mean. If you referring to the stock emaxx yes if you have a emaxx mip drive cup. If you talking the hb diffs no cause they are a 8 mm shaft instead of 6mm. Tmaxx tranny drive cups are only a 5mm cup.

the pinion gear on the hb diff. lame so i need to find 2 8mm drive cups. are the ue ones strong? do they sell 8mm drive cups

Yes ue cups are strong and have the 8 mm drive cups.

If you get the 8mm , you will never brake it, it will probably go last unless you put in 10s lipo, which i think should still hold up fine.

@stampy, No a mip cup is 6mm, the HB diffs asus an 8mm.

I have the UE drive cups for those in the need as well. 8mm bore drive cups are needed. Any 8mm drive cup should work(UE, ofna, HB, etc.).
The lightning diffs come in two flavors - Buggy and truggy. The truggy diffs have a lower ratio and are helical cut(ring/pinion). These are a great choice for center diff/direct drive applications.
The buggy diffs have the standard 1/8 buggy ratio (3.31:1) and will work exactly like the UE diffs or any other 1/8 diff setup. The ring/pinion gears are not helical cut on the buggy diffs.
Both have hardened internal gears.

well crap i typed some stuff into that speed calc thing. and it looks like the only way to run those diffs are if your running a center diff. if you have a emaxx trans it you will need a ridiculous pinion size to get a nice final ratio

Did you type in for truggy or buggy type?

thats for the truggy ratio. the buggy ratio will work but id like to run the helical cut truggy gears cause they should be stronger

for the buggy ratio i get
14.53 to 1 final ratio
and 49.61 mph this is with a 5.5" tire .25" for groth, emaxx locked in second with 51 20 gearing

as for the truggy diff, to match that ratio and speed i would need a 26 tooth pinion if every thing else stayed the same. thats a huge pinion :eek:

Stampy, you don't need to worry about the strength of the non-helical. They are tough.

My guess is that they are made helical, because otherwise a 10/43 would make too much noise. (this is one of the reasons why helical gears are used in transmissions of cars)

ok started adding stuff up and found out that to use these gears i would need the gear set from mike 65 x2, a setup kit prolly 10 buxs, plus s&h then i would need a diff housing and 2 drive cups from ue 132 plus s&h, so ad it all up and you get 272 plus s&h. what im getting at here is the 8spyder kit from ue is 260, is the hb gear set really worth that? would the hb gear set be stronger than a ue 8spyder set? i know there gears are hardened and i know how strong stuff gets when you harden it but are all the gears in the hb gear set hardend?

The diff sets sold here include the bearings and drive cups, stampy. Put them inside a hybrid bulkhead and you come out pretty close in price to the 8 spider set with the cases(which aren't often in stock), but you have bulkheads in addition to the diffs. The diffs themselves are less expensive than the UE 8 spider diff sets. And yes, all the gears are hardened.

got couple questions
- will THS maxx CVDs fit into HB diff cups? or at least what are the measurements of those cups?

- OK i need 8mm cup for the pinion will my front MIP CVD and rear FLM dogbode (comes with the extended maxx chassis) fit in those?

i run mip cvds with my hb diffs on my maxx and they work fine. no problems

and are central MIP CVDs same size as axle CVDs?

yes the ends are the same size

What kind of diffs do the VBS's use. 1/8 (mostlikely if i hade to guess) or standard.

great and last question to clear it out which 8mm cup for central CVD you use with those diffs? i found like 3 different ones on TowerH

The VBS use 1/8 scale diffs
I just got mine off mike i think they were hb but not real sure. whatever they are they work great for me

THS CVDs DO NOT fit the HB diffs.
guess i will get the MIP ones