I put a used d80 in my cummins a month or so ago and I just filled the fluid everything turned ok so I said whatever well pulling a trailer back 300 miles yesterday I lost the abs speed sensor no mph abs brake light on blah sp I go get another sensor thinking that was shot  pulled it out and half of it was missing well long story short everything meshes and is quiet so I'm going to run it just weird 

I'd take the cover off, spray it down with brake clean and blow it out, then refill.  Cheap insurance, no need to have any thing going through the bearings  let alone the ring and pinon. 

I did that yesterday when I changed sensor long story short I pulled the cover and that came out located where it came from it was the back of the pinion most  of the tooth is still there and everything  is quiet and turns smoothly so ing going to run it 

I replaced my ring and pinion due to a tiny chip in the ring gear (from shredded spider gears).  A whole tooth missing like that is asking for trouble down the road, since helical gears distribute the load across three or so teeth, eventually the two surrounding teeth will give out too.  A Spicer ring and pinion is $198 from rock auto.

Edited June 18, 20186 yr by trreed

Not whole tooth part of a tooth say a 8th

These D 80s aren't the stuff as I thought they would be, but then again I've broken 2.5 ton stuff playing around.

Gotta remember these axles are getting towards 20 years old.... Metal is gonna fatigue in that time, and they're rated for 2000 ft-lbs of continuous torque... which can easily be exceeded in stock form.  Mine was holding fantastically until i got stupid about it.

42 minutes ago, trreed said:

Gotta remember these axles are getting towards 20 years old.... Metal is gonna fatigue in that time, and they're rated for 2000 ft-lbs of continuous torque... which can easily be exceeded in stock form.  Mine was holding fantastically until i got stupid about it.

Hardened titanium and maybe 2 more alloted brain cells to control or, Hold my beer and watch this!!!!! Snap crackle pop!!

Edited June 19, 20186 yr by dripley

I misspoke.  Looks like a Dana 80 is rated for 3000 ft-lbs input torque, 2500 ft-lbs COT (continuous output torque) and 10000 ft-lbs MMOT (Maximum Momentary Output Torque)

Edited June 19, 20186 yr by trreed

Guys my brain hurts lmao I was in class all day

@dripley I only got like 4 or so...  2 to watch driving is almost too much to ask!

12 hours ago, trreed said:

I misspoke.  Looks like a Dana 80 is rated for 3000 ft-lbs input torque, 2500 ft-lbs COT (continuous output torque) and 10000 ft-lbs MMOT (Maximum Momentary Output Torque)

This sounds like quite a bit, I think I'll be lucky if I'm making 1000ftlb and 400hp

Dana is still gonna feel way more torque due to the gear reductions. 

Edited June 20, 20186 yr by trreed

1 hour ago, trreed said:

Dana is still gonna feel way more torque due to the gear reductions. 

I was wondering how those numbers were possible, but now understand. Thanks.

Yeah, assuming @Dieselfuture reaches his maximum torque of 1000 ft-lbs in 4th gear (1.39:1), that's 1390 ft-lbs input to the D80.  Adds up quick, if we assume maximum torque can be reached in 3rd or even 2nd.  Even more when in 4Lo and an additional 2.72:1 is multiplied in.

Edited June 20, 20186 yr by trreed

Keep laughing @Dieselfuture machine tool program is no joke I'm in school to be a machinist 

Edited June 21, 20186 yr by Silverdodge

Well blew the pinion last night

On 6/18/2018 at 7:38 AM, trreed said:

A Spicer ring and pinion is $198 from rock auto.

 

5 hours ago, Silverdodge said:

Well blew the pinion last night

Makes me rethink my new 7x10 , need to learn how to ease in to it man 

But seriously it must be age of these axles and the abuse other the years, hard to believe a healthy d80 will grenade with 500hp but then again I've blown up 2.5 ton stuff pretty easy before too.

19 hours ago, Dieselfuture said:

Makes me rethink my new 7x10 , need to learn how to ease in to it man 

But seriously it must be age of these axles and the abuse other the years, hard to believe a healthy d80 will grenade with 500hp but then again I've blown up 2.5 ton stuff pretty easy before too.

We think the pinion had issues before hand

Might as well plan on a new bearing set.  Timkin set from Rock Auto is about $200 too.  Only stupid thing is the kit doesn't come with the shims.  I got lucky and was able to use the factory stack and be fine.  Is it a limited slip unit? If so, might as well plan on clutches.