Can anyone guesstimate what has caused this damage to a 2wd rear diff? It's fitted to a 330bhp Saph and has run SAE 90 oil since fitting under a week ago. Any help would be greatly appreciated

 

There week diffs so iver your torque has fucked it or some thing had gone through them gears and ruined them! But more likely torque

 

I would say something was in there that shouldnt have been.

 

Can I comment on this fletch?

 

was it rebuilt before it was fitted?

or did you buy a used one and just bolt it in with some new oil?

torque kills the crown and pinion, not the planets, possibly the bearings were too tight.loose

 

Lol torque brakes the side gears! Then you fit a gripper or a quaife and torque brakes the c.w.p!

 

just looks like its had a hard launch

 

dropping the clutch does that

 

Guys I can confirm 100% it was not launched just pulled away as normal and it stopped like the clutch went no bangs or anything it just revved up a bit and wouldn't move

 

just put new broken bits in then and away you go

 

We want to know why this happened tho Dojj

 

I'm assuming You bought the diff from Fletch and it broke?

 

in my experience with a cossy diff that can happen anytime any where!

 

Yea mate not getting arsey or anything just don't understand what happened to it as I never launched it or anything like that I honestly just pulled away in 1st slow as well as I was low on fuel

 

Very difficult one

 

Well if you didnt launch it....someone did lol

 

Don't want to upset either party.. But IMO that's been launched to do that .. Or was very very week to start with .

 

My old diff looks the same as that, but I did drop the clutch pretty hard to do it

 

Guys I honestly never launched it or anything just pulled out away that is all I don't launch it as its my daily car

 

that's exactly how mine looked when it went - rwd cossie estate fully loaded and launched

 

Like said ,if it broke on you that easy then id say there was damaged planet gears from a hard launch before you bought it..

Only ever seen broken planet gears from launches

 

Interesting you say that mate as I have never launched it I made that mistake on my old one and it blew up massive

 

What does JB think? He's had experience with diffs.

I blew a few RWD Saff diffs and the planet gears looked like that after a hard launch generally. Saying that, I bought a second hand diff once that was supposed to be good that came from a running car. I fitted it and it soon broke but I didn't launch it - I simply came on boost going up a hill! That turned out to be planet gears.

Obviously had a fair amount of strain on it but certainly wasn't mistreating it.

 

Look at the pitting on the gear teeth lol if there's lots they were worn! Is there any teeth missing from the gears? Maybe one was loose in the diff or finally gave in and came free then went through the gears!

 

I have refrained from posting as I've wanted to see people's views on the matter and the only reason I am posted is for Trev. If the planet gears were broken in half as pictured would they of lasted 7 days in the car?

I have confirmation text diff was fitted on 23/04/2013 and a text dated 30/04/2013 saying diff was dead. I also have pictures of the last diff removed from the same car with snapped planet gears.

 

They weren't broke in half before mate

When I launched my old one it destroyed the c w p and planets mate so this wasn't launched

 

I have literally just spoke with him and his confirmed everything I believe and explained how the planet gears actually work which makes things easier to understand.

I'm not getting into an argument on here or anything, I will text later mate to discuss.

 

What I can't understand is how it just gave up on me I can swear on my life I have never launched this diff I did it once in my old diff and that shit me up so never again lol

Fletch put my old pics please mate

I blew the c w p and casing

 

it "appears" that there is a lot of wear on the shaft in the remaining pic, which could be caused by the gears breaking up and also the chipped teeth in the remaining gears as shown

but why BOTH of them have split in half rather than just sheared the teeth off.......

 

A diff from my old cossie after a launch at Pod, that doesn't happen without a launch imo. A used cossie 2wd rear diff is not the sort of thing to come with a guarantee surely?

 

Thanks everyone for the replies and views the matter is now dealt with as far as I am concerned thanks to everyone's feedback.

Mods feel free to delete this thread please.

 

Not in my eyes it's not mate

 

unless the diff was ex rayed before you bought it you would never know the condition nor would Steve even tho it worked it could have had a hairline crack in the gears.

this is the risk i think we all take buying secondhand parts i think its a 50/50 situation.

 

Why not text me again then mate instead of posting on here? I'm not arguing on an Internet forum as that's just childish. You have my number feel free to express anything you wanna say, but I believe I have been fair and clearly explained my view on this situation.

 

Its a cossie diff. They all expire at some point. One minute they work, the next they dont

 

Surely nobody can ever expect a warranty on a second hand cossie diff! Especially when it is being fitted to a non standard car!

 

I have a quaife atb with 3.9 shot peened cwp If intrested pm me

 

I doubt it not on 20yr old parts.its a lottery!!

 

The thing with this is it last 7 days after fitting! So how can Fletch know how you have treated it. The diff was working when you fitted it, which means it would have been working when Fletch sold it.