Ital diff - help please

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four20
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Ital diff - help please

my 1995 Seven has (I believe) an Ital diff which at the moment is making cringe making bangs as I let in the clutch on take off and when changing gear.   I have a spare unit which came with the car but can’t find a specialist to assess/refurbish it before changing it for the nasty one in the car. My local chap says he won’t be able to source spares.

I’m based near Reading and would appreciate any recommendations for getting it checked/refurbished or replaced.

thanks in advance,  Tony Booth

Jonathan Kay
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I'll open the bidding: talk to Road and Race Transmissions. (They're in Sevenoaks.)

But are you sure that it's the diff rather than the propshaft?

Jonathan

Wrightpayne
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From what I have read Jigsaw Racing do some worthwhile upgrades so maybe chat about refurbishment.

four20
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Thanks for the fast replies chaps, my mechanic reckons that the prop shaft is OK, he had a look today when he did my MOT.  I’ve left a message with Caterham Cars too, they have a massively reduced unit that I hope might fit! (358 quid - down from £1200!)

i’ll give Jigsaw and Road and Race a bell tomorrow. 

Thanks again.

Tony.

Wrightpayne
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Tony,

I think the caterham part you have mentioned is a Sierra diff and wont fit. 

Ian

Nick Chan
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Might be worth checking the two top hat bushes that locate the A frame at base of axle. They degrade over time (in the line of fire for oil and road crap!) and then allow the diff to move slightly when accelerating or changing gear as the load goes on and off the drive train. 

DaveMorris
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Agree with comment from Nick, as I had similar issues at one time with my L.A. car (and also with others who mentioned Jigsaw, R&R . . they're good firms, though Jigsaw I think is more a triumph/ital specialist I think).

I would also check gearbox mount, and for amount of free play (backlash) on each of the rear wheels.

Dave

Nigel Riches
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.....another   Thumbup  for the rubber top hat bushes under the diff, these don't last long if there is any oil on them, well, they were originally steering system bushes, so not designed for oily contamination.

Some Nolathane bushes would be a good replacement, more expensive but longer lasting.

Or an "A" frame with Rose joint under the diff, more expensive again, and I don't know if these are still available, I have one and in over 30 years have only replaced the Rose joint twice.

Check those bushes before rushing off to R & R and co.

Nigel. 

Jonathan Kay
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If it's the bushes can you feel the excess play by hand or with a lever when the suspension is unloaded?

Thanks

Jonathan

paul_w
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On my car, just putting the handbrake on and rocking back and forth showed the bushes were gone. Plus if it still knocks then, you know it's suspension, not driveline.

If the axle bushes haven't been done, they are worth doing and carry spares on long trips - I had mine go in France which limited the enjoyment on the run back!

bjw
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I would have to agree it sounds much more like a bush problem than a diff problem.

As Nigel says, polyurethane bushes last a lot longer than the rubber ones. They're more expensive obviously, but only ~£15, and then pretty much fit and forget even if they're soaked in oil.

Cheers