ist gen emaxx to 2nd gen emaxx - RC-Monster Forums

**ist gen emaxx to 2nd gen emaxx -** 11.07.2008, 11:13 PM

i have a ist gen emaxx black frame i would like to extend it with the 2nd gen frame the gray one,i have the gray frame already what else will i need it looks like i will need a new tranny anything else ?

magman · 11.07.2008, 11:15 PM

I believe you should be able to bolt it right up to it w/out any mods.

11.07.2008, 11:27 PM

It will bolt right up to the front and rear ends, but the tranny won't. The new tranny has different mounting holes. Your front drive shaft will also have to be shortened.

magman · 11.07.2008, 11:28 PM

I forgot about the different mounting holes

thephilonator · 11.07.2008, 11:32 PM

the 3905 (gen 2) chassis is a direct drop-in for the 3906 (gen 1) bulkheads although the gen 1 tranny will not fit in the gen 2 chassis. and yeah, front drive shaft will need shortening.

ICUBoy · 11.08.2008, 12:01 AM

Quote:

Originally Posted by thephilonator

the 3905 (gen 2) chassis is a direct drop-in for the 3906 (gen 1) bulkheads although the gen 1 tranny will not fit in the gen 2 chassis. and yeah, front drive shaft will need shortening.

So Philonator does this mean the gen II (3905) bulkheads and diffs can drop in to a gen I (3906) chassis? Is this a cheap upgrade path perhaps???
Many thanks
Regard
David / ICUBoy

Tempted · 11.08.2008, 03:51 AM

The 3905 and 3906 use the same bulkheads, arms, skids and more. The diffs are not the same but are interchangable and the driveshafts/knuckles are also different. To use a new style chassis on an old style E-Maxx you need a new transmission, motor plate, chassis braces and center driveshafts.

**emaxx -** 11.08.2008, 12:02 PM

i am taking it apart now and it looks like something in the searing is different to,the old black frame has 2 plastic post coming down that dont come off,the new gray frame only has 1 any ideas

Tempted · 11.08.2008, 01:24 PM

Doh I forgot. The new truck has an idiotic dual steering servo system. Very unnecessary and complicated. If you go with a new chassis do youself a favor and ditch the dual servo set-up for a much easier and more reliable single servo. Also, if you don't already know the new truck has a single speed transmission so there won't be a need for a shifting servo.

**emaxx -** 11.08.2008, 01:32 PM

do i need to buy something to make it single or will the parts i have now work

lincpimp · 11.08.2008, 02:44 PM

Lets clear this up...

The new emaxx has a different tranny, chassis, center skid, lower chassis braces, driveshafts, and steering.

The rear driveshaft on the new emaxx is basically a wheel driveshaft from the revo, with the same yoke on both ends. The front driveshaft is identical to a 2.5 revo front center driveshaft.

The new tranny has a different bolt pattern to the old tranny. Plus the lower chassis braces are different as they are spaced wider on the chassis.

The bellcrank mounted servo saver setup on the new emaxx is much superior to the old one. It is easy to setup as a single servo, or run it with 2 servos.

The diffs out of the new emaxx will fit any maxx bulkhead. You will have to do the 3.3 upgrade to the old emaxx as the stock old emaxx driveshafts or cvds will not fit the new diffs without modifications. The pin that holds the driveshafts on is closer to the case on the new emaxx. Same issue with the center driveshafts, easiest to use the revo style ones that come with the new emaxx.

Tempted · 03:10 PM

Quote:

Originally Posted by lincpimp

The bellcrank mounted servo saver setup on the new emaxx is much superior to the old one. It is easy to setup as a single servo, or run it with 2 servos.

The diffs out of the new emaxx will fit any maxx bulkhead. You will have to do the 3.3 upgrade to the old emaxx as the stock old emaxx driveshafts or cvds will not fit the new diffs without modifications. The pin that holds the driveshafts on is closer to the case on the new emaxx. Same issue with the center driveshafts, easiest to use the revo style ones that come with the new emaxx.

The steering is better designed with very poor stock servos. And one good aftermarket servo will outperform the dual servos without the hassle of setting them up and stripping the gears.

As for the diffs, just trim the little ring on the stock driveshafts and it will bolt right up. I use a pair of nail clippers but a hobby knife would be easier. The 3905 diffs are an improvement over the 3906 pieces but a 3906 4 screw case with a cheap aluminum cup is stronger yet.

What I did with my truck is kept the stock chassis and upgraded the drivelines. I use 3905 driveshafts, Revo 3.3 center shafts 3905 axle carriers. I use a stock 3905 front diff and a spooled 3906 rear diff. This way I can keep the two speed transmission, single steering servo and symetrical motor plate. The 3905 chassis is known to break just as bad, maybe worse, than the 3906 chassis without significant handling improvement. The 3905 feels more stable not because of the longer chassis but because of the wider stance. The 3905 driveshafts, turnbuckles and axle carriers will add quite a bit of width to your 3906 making it much more stable through the turns and the 3906 set-up is lighter with better gearing for improved acceleration and less stress on parts due to weight.

lincpimp · 11.08.2008, 03:47 PM

Tranny is much stronger in the new maxx... My only complaint with the old emaxx is the tranny, and the stupid weak driveshafts. The 3.3 arm, hub and shaft conversion cures a bunch of issues. I will say that the new emaxx diffs are holding up much better than a fully done up al cup hardened gear 3.3 case old emaxx diff did... maybe it is just me...

lincpimp · 11.08.2008, 02:45 PM

Quote:

Originally Posted by keng

do i need to buy something to make it single or will the parts i have now work

If you have the new steering setup you use one servo on it. Leave off the other short link and servo horn. Easy to do, and you will not have to adjust the linkages to get the servos to center properly (this has to be done or the servos will fight each other and burn out faster)

Tempted · 11.08.2008, 04:02 PM

I had a bunch of new diffs explode on me is why I'm not crazy about them. And I still don't understand the tranny problems. Maybe its just because I keep my trucks light but I have yet to break any gear in the tranny. I twisted a lightweight output shaft(I was shocked) in two pieces and break 3905 driveshafts every time I run but my trannies have never failed. My V-Twin with the spool in rear and heavy weight oil up front gets bookoos of traction(too much) and still hasn't broken a tranny gear after hours of use and straight up abuse. Watch my videos to see that my truck goes through. Maybe I'm just lucky. I do take my trannies apart about once a month just to check teeth and grease them but I just don't have failures. My biggest upgrade suggestion is to get rid of the crazy weak stock driveshafts and then upgrade at least the rear diff.