Xr6t Diff

[Turbo6man]

It is way too common in many late model Fords (and others). Driveline shunt is not acceptable but not enouigh people complain. The standard response is "that's within normal tolerances" or "you will get that with modern engines having so much torque straight from idle". Well it BS and I don't accept it cannot be fixed - Ford really need to address this issue as it has been around now for several years, and with higher performance motors coming through and also a trend back to manuals, it is not going to go away. Funny how the old GTs didn't do it and I seem to remember they had quite a deal of torque at idle!!!

[Guest harasn]

Just for reference my diff isn't LSD and it still makes those cluncks.

since when did the AU XR6 not have LSD. I hate how the BA XR6 doesn't have LSD and will get it on the next one as with a manual it wheel spins too easy especially in the wet.

[XR6T_someday]

Just for reference my diff isn't LSD and it still makes those cluncks.

since when did the AU XR6 not have LSD. I hate how the BA XR6 doesn't have LSD and will get it on the next one as with a manual it wheel spins too easy especially in the wet.

LSD was an option in the AU series aven the AU3.

[Guest exr6]

I have had 3 XR6's, AU1 & AU2 had the LSD as standard, but on the AU3 it was an option...... Go figure!!!!

[cdm]

I have this clunk in my auto AU XR6VCT. I have taken it back to the dealer about 8 times for this noise. APPARENTLY everything is within tolerence. They did change the diff oil which fixed it for about a month then it came back again. As much as I hate it, I learn to live with it. If I boot my car, then suddenly take my foot off, it sound like it hangs onto the gear for a second, then a loud bang as it upchanges and the whole car shudders! :( According to one of my mates who is an apprentice in the workshop, he reackons they replaced the whole diff on an AU XR8 3 times! I really really hoped this wouldn't be the case with BA but it seems it may be. Dam Ford, it's a known problem, surely when spending half a billion dollars on the car of the year, they would have realised this problem!

[WBT56]

Interesting that the driveline diff clunks and shaft whirring are still existent in the XR6-T's.

Just for reference my diff isn't LSD and it still makes those cluncks. So I don't think those chatter kits would help.

I would of thought the 2 piece tailshaft would of solved most of the noises.

The clunk when you power on/off is caused by excessive backlash between the crown wheel and pinion (and then additive (wear related) backlash in the hemisphere and half shaft CV's.) Therefore a low KM car will be predominantly C&P backlash only, and only a rebuild will fix it.

The clack/clack around corners is an LSD problem, as it grabs/slips/grabs/slips as you go around a corner. Again rebuild time. Synthetic oil (chatter kit) only fixes this one by lessening the effectiveness of the LSD so it doesn't grab as hard, so it doesn't release as sharply. BA uses wet clutch pack apparently, so this shouldn't be a problem.

Alloy tailshafts have nothing to do with the noise, they just amplify it so it can be heard more easily. Therefore going to a steel two piece (unpainted, BTW) will not fix it. (it just contains another CV to wear out.)

Sometime during AU Ford swapped std LSD for colour coded mirrors, not that you can see colour coded mirrors in a cloud of one-wheel smoke.

[Guest harasn]

According to one of my mates who is an apprentice in the workshop, he reackons they replaced the whole diff on an AU XR8 3 times! I really really hoped this wouldn't be the case with BA but it seems it may be. Dam Ford, it's a known problem, surely when spending half a billion dollars on the car of the year, they would have realised this problem!

what you need to realise, is that Ford don't make the diff. BTR, I think, do and they always, like most other companies, look for the cheapest and easiest way out. It will get fixed eventually but our diff is a better version than Expensive Daewoo has.

[WBT56]

what you need to realise, is that Ford don't make the diff. BTR, I think, do and they always, like most other companies, look for the cheapest and easiest way out. It will get fixed eventually but our diff is a better version than Expensive Daewoo has.

Two things: 1) Does this mean that ANY componant not made in house by Ford can not perform and you will accept this excuse?

2) The part of the diff that clunks is the same as the one used by Holden. (crown wheel and pinion) (and Holden's doesn't clunk)

[Guest harasn]

what you need to realise, is that Ford don't make the diff. BTR, I think, do and they always, like most other companies, look for the cheapest and easiest way out. It will get fixed eventually but our diff is a better version than Expensive Daewoo has.

Two things: 1) Does this mean that ANY componant not made in house by Ford can not perform and you will accept this excuse?

2) The part of the diff that clunks is the same as the one used by Holden. (crown wheel and pinion) (and Holden's doesn't clunk)

Answer to 1) I don't mean this at all. What I am saying is that even though the problem is on a ford vehicle, it is nots fords problem to fix. The people who make the diff need to fix it. Ford can jump up and down and tell them to fix it but due to the fact that not many companies make what the diff company does, they stuff around. They are in the building diffs to make money just like ford builds cars to make money. Same as the reason we have trouble with auto gearboxes for powerfull cars. If they built it stong enough from the work go it would cost to much so they try to do as little as possible. Do you remember the problem of door locks cycling on Ef to EL cars. It cost the door lock company Billions of dollars due to the manufacturer not fixing his product properly the first time the fault was seen. 5 versions later he fixed it and we went away from his design. I think in these days of every increasing power the gearboxes and diffs have to work harder then they ever have and need to be made to suit. Only time will tell if our current supplier can do it. I know its not good enough from the companies involved, so take my comments how they are meant, as information not justification...

Answer to 2) I think you had better go and talk to some Expensive Daewoo people as they have complained about diff clunking for probably longer than we have. Also their crap IRS design probably flops around enough due to not being mounted solidly that the thumps and knocks are not as evident. From memory we got the newer version of the diff than they did.

[Ninka]

Guys I agree that it is annoying with the backlash in many modern cars, and must say that I disagree with the statements from Ford that it can't be fixed or is within tolerances!

The problem is that there are too many drive splines, CV joints etc on a modern car with independent rear suspension and two-piece tailshafts.

If you compare the driveline of the BA to say the EF Falcon, then on the BA you first have the spline from the gearbox to the propshaft, then the propshaft bearings, diff with C&P gears, inner CV joint with a spline, and outer CV joint with spline. On the EF there was a one piece propshaft and no CV joints as it had a stiff rear axle. Splines at the CV joints are particularly sensitive as they transmit from a small diameter shaft to a large diameter CV, so even very small clearances cause quite a bit of backlash.

To fix this problem, Ford would have to specify closer tolerances, which in turn would cause more rejects and a higher price on the components, IT IS A COST CUTTING EXERCISE!!

I did a lot of work some years ago an an European ford with a similar problem, and only after disassembling the entire driveline, and applying LocTite to all splines did I eradicate the problem.

Hope to have been of help