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Old 06-12-2016   #16
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Re: Low velocity shake

No im not.im talking ********.apologies from me.Got that much crap going round in my head,its coming out me mouth.Thats a 5speed auto.
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Old 06-12-2016   #17
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Re: Low velocity shake

OK,
I had a look and there is good and bad news. The good is that Vectra C's used the AF 40 box and the driveshafts should fit. The bad news is the Vectra shafts seem to have tulip CVs.
see ebay items 142194865676 and 142194865089for images.
Note that the manual M32 inner driveshaft is different between the Fiat and Vectra. The intermediate bearing mount attaches to a different position on the gearbox. So you can't say they are directly interchangable, but they can be fitted.

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Old 06-12-2016   #18
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Re: Low velocity shake

At the risk of making a show of myself again,i thought the 2.4 had different final drive ratio and a stronger box?
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Old 08-12-2016   #19
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Re: Low velocity shake

Quote Originally Posted by ojh View Post
> I also changed my driveshafts with new ones, but the problem remained.
Did the change have any, even temporary effect at all?
I'm not entirely sure but I think that in the beginning there was an improvement. The problem is, as we mentioned, that when it's cold аnd when the car drive a short distance and unladen - it's barely noticeable. Such were the conditions for me after the change maybe for two months.... so I'm really not sure

By the way - did you felt something like a fine vibration in the cabin and through the pedals when reaching the 2000 rpm? Аnd after the gear shift and low RPMs that vibration disappears until reaching again 2000 rpm?
Both problems appeared to me at the same time I think....
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Old 11-12-2016   #20
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Re: Low velocity shake

2.4 auto driveshaft









1.9 110kw driveshaft




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Old 11-12-2016   #21
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Re: Low velocity shake

They look different.The 1.9 looks "wasted"
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Old 11-12-2016   #22
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Re: Low velocity shake

The critical area is the gearbox end. The spline and oil seal running surface may be different. It would need careful measurement to be sure they are compatible. The lengths could be different too.

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Old 24-12-2016   #23
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Re: Low velocity shake

OP here again. It's Xmas Eve and I have finally time to write a few lines.

The garage made a new diagnose but it was very sketchy, they did not take anything apart but just state that the vibration "apparently comes from driveshafts". Yeah right. Negotiations continue.

I've made inquiries elsewhere and a new possible cause has emerged: worn or sticking inner end splines. Has anyone here experienced or even heard driveshaft splines or the inner end in general wearing out, becoming loose and causing vibration?

Happy Holidays to Fiat owners around the world!
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Old 24-12-2016   #24
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Re: Low velocity shake

I guess it's possible. If the old "tulips" were rough they would impart additional stress to the splines. Gearbox spline wear is not unheard of. some Range Rovers suffered from wear of the main gearbox to transfer box splines due poor lubrication.rouble was ou have to completel dismantle the gearbox to get the shaft out. As the end of the shaft and transfer box input gear are accessible in the car it was not unkown for a dodgy mechanic to drive hardened shims in the gaps or even weld them together as a quick fix to sell the car.

The cure on the Croma would be a new differential. It's not pactical to DIY change just the output gears due to the tolerances required.
It would be hard to tell if the splines are damaged without taking the differential out or at least exposing enough of it to lock up the output gears while checking the shafts for play.

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Old 25-12-2016   #25
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Re: Low velocity shake

Perhaps a more simple idea would be to take the shafts of,and take them to a prop specialist and get them checked and balanced.The MB vitos suffer with driveshaft problems to.
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Old 25-12-2016   #26
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Re: Low velocity shake

Quote Originally Posted by buster View Post
Perhaps a more simple idea would be to take the shafts of,and take them to a prop specialist and get them checked and balanced.The MB vitos suffer with driveshaft problems to.
Hi,
I don't think checking the shafts going tell if the splines in the diff are damaged.
The driveshafts have been replaced once with little apparent improvement so either it's not them or something else (e.g. engine / gearbox mount, suspension alignment) is damaging them.

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Old 25-12-2016   #27
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Re: Low velocity shake

Not the whole driveshafts have been replaced, only the inner parts with the tulip. But AFAIK shaft unbalance would cause vibration at the same frequency the wheel of rotating, in my case the frequency is clearly three times the rotational frequency.
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Old 26-12-2016   #28
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Re: Low velocity shake

Half of the problem is,people see a bit of lift in a shaft and automatically assume that must be the problem.We work on equipment were the the output flange has masses of lift in it,runs at full engine speed.Generally if there balanced they seem to run true.Why dont you run it on a rolling road and watch what happens?
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Old 26-12-2016   #29
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Re: Low velocity shake

Quote Originally Posted by ojh View Post
Not the whole driveshafts have been replaced, only the inner parts with the tulip. But AFAIK shaft unbalance would cause vibration at the same frequency the wheel of rotating, in my case the frequency is clearly three times the rotational frequency.
I had not realised that the whole shaft had not been replaced. This does not sould like good practice. From ePer

Item 1 is the outershaft with the tripod and 3 bearings. this is common to both sides on all but the 2.4. which has a diffwernt LH shaft. Items 3&4 are the outershaft and "tulip" cup. If thte garage only changed item(s) 3/4 I'm not surprised the fault came back as the high wear part is the tripod and bearings. Did they fit a new tripod as well? see

Item 3 on this drawing?

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Old 26-12-2016   #30
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Re: Low velocity shake

At least they charged me about the tripods. Can't say for sure if they actually changed them - did not get the old ones back.
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