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Imp rear end blew. Suggestions?

impwithalimp

New member
Just happened, guessing the pinion sheared. Loud bang while hauling a tree and now just a spinning driveshaft. 1404 with C4 rear end. Any suggestions for an upgrade instead of rebuilding it? Guessing it sheared since I mainly use the imp for hauling firewood or gear to my place from the nearest road. Is the Oc-12 worth it with the mods involved from it being wider? Any sources in alaska?
 
Also, of note for any suggestions. I got it winched up to some higher flatish dry ground on my property before the winch blew as well. So I'm going to have to balance the practicality of upgrading it with the reality of working on it out in the woods with no power...

I can get most things done but definitely a different situation than if it was in a shop with a welder etc
 
Lots of imps with oliver clark 3 speeds.

The oc12 is a worthy upgrade as the super imps (model 1450) had them stock.
Yeah thinking that the oc12 is sounding worthwhile so I don't end up back in the same boat after a repair. I definitely don't need much in terms of gearing back there but pretty disappointed in how much of a setback this has me at so beefing it up seems smart. Just barely pulling on a small dried out firewood tree. It was cruising along as if it barely felt it back there at 2k rpms and bang... I use it more as a workhorse year round, but have been pretty careful about babying the rear end.

Hoping I can find a way to fit one with shorter axles so I don't have to go to the wider footprint of the super imp. If anyone has details on that, much appreciated.
 
Just happened, guessing the pinion sheared. Loud bang while hauling a tree and now just a spinning driveshaft. 1404 with C4 rear end. Any suggestions for an upgrade instead of rebuilding it? Guessing it sheared since I mainly use the imp for hauling firewood or gear to my place from the nearest road. Is the Oc-12 worth it with the mods involved from it being wider? Any sources in alaska?
I'm not a snow machine owner but if its an open rear and you loose an axel shaft it will do the same thing so you could just need axel.
 
I have owned an Imp. It is the Last machine I would use for dragging wood on Unsnow covered ground.

How much ground clearance when you stuff an OC12 in it ?? What breaks next ??

My suggestion... fix it, sell it, buy a J5.
 
I have owned an Imp. It is the Last machine I would use for dragging wood on Unsnow covered ground.

How much ground clearance when you stuff an OC12 in it ?? What breaks next ??

My suggestion... fix it, sell it, buy a J5.
That's probably the most reasonable advice I didn't want to hear.. have grown quite fond of the imp but you're probably right.

We will see. By the time I finish pulling this rear end out I'll likely be lucky to even find parts and repair before the snow starts so might not have many options.

I did once hear there was someone in alaska who machined hardened rings for these diffs. Has anyone heard of this or know if he's still around?
 
I'm not a snow machine owner but if its an open rear and you loose an axel shaft it will do the same thing so you could just need axel.
Well I can hardly believe it but you were right. Snapped axle. Big sigh of relief! Didn't think that was the case since I tried running it with the tracks mostly off the ground and applying the opposite brake band to test. Noticed it right away when the tracks came off though! Peering inside the case now and ring and pinion looks healthy.
 
Well I can hardly believe it but you were right. Snapped axle. Big sigh of relief! Didn't think that was the case since I tried running it with the tracks mostly off the ground and applying the opposite brake band to test. Noticed it right away when the tracks came off though! Peering inside the case now and ring and pinion looks healthy.
Been there and done that we were lucky the spider was open centered and we could push out the broken shaft after pulling the other axel no major disassembly required. Good luck on finding one.
 
I have a J5 project pile ( apart for paint I was told ) i would sell. I see everything but a radiator . it has a winter cab. My original thought was just put the J5 differential in, but now with JUST a axle I agree with the advice above
 
I have a J5 project pile ( apart for paint I was told ) i would sell. I see everything but a radiator . it has a winter cab. My original thought was just put the J5 differential in, but now with JUST a axle I agree with the advice above
I would be interested except I don't have a way of getting all that out to my property where I could work on it. Pretty much limited to what my 6 wheeler can carry other than the imp... truck and trailer won't make it.

Probably for the best I can only get running equipment out there. My time seems to fill up quick with projects as is!
 
Even if you wanted to replace it with an OC-12 or OC-4, where would a person even find one?

Glad it was "just" the axle.
They are around. Problem is meta. Face book feeds dopamine hits immediately and in high doses. The river of content is massive. With that said.
The people that have parts. Is large. People that Are willing to share. Is small.
People with parts Are smart people. Most of these Smart people network together. In the video posted by cider tom, larry at tracked outdoors said it best. " snowcat people are really, really good people".... go network with smart hard working people, be polite be patient and it seems like parts are everywhere. OR just go to napa.
 
would a ford 8.8 rear work you might have to cut it down but its open fairly heavy or better yet a dana 35 or 45 parts are readily available for them from the jeep suppliers.
So this has been tried. It works. Poorly for a short while.
Google differential. And controlled differential. Controlled differentials put torque to both tracks, standard differentials put biased torque to wherever it can go.
Apply a brake torque will go through the cross pin out the other axle. (For awhile)
 
The Russians have hundreds of YouTube videos use standard automotive open differentials in DIY snowcat builds. They are almost always smaller/lighter, and typically have track widths around 12”.

So yes, it’s being done frequently all over Russia, but the smaller tracks/lighter vehicles probably incur far less load/strain on the differential.

And of course Matt’s Off Road Recovery tossed the Bombi diff and put an automotive diff in.
 
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