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fg diff and output cup movement

Old 10-27-2005, 09:06 AM
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radio_controlled_mad
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Default fg diff and output cup movement

how much play/movement is there supposed to be between the output cup (ball drive) and the diff - after fitting a new slip diff fg 8500 i noticed there is around 4/5mm side to side play between the cup and diff bearings - this might be normal to allow for movement in the rear arms ect but it is the 1st time i have noticed this and just seems the gap and play should be alot less for the splines to mesh.
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Old 10-27-2005, 09:12 AM
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kengentry5000
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Default RE: fg diff and output cup movement

Don't have a clue on your issue but I have to say that is one sweet looking rear end! My 8485 diff for my Firehammer should be delivered tomorrow. I can't wait to install it over the weekend.

Ken
Old 10-27-2005, 09:37 AM
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Default RE: fg diff and output cup movement

The shaft you are pointing to has the color of nylon/plastic. It is alloy right?
Old 10-27-2005, 09:44 AM
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Default RE: fg diff and output cup movement


ORIGINAL: kengentry5000

The shaft you are pointing to has the color of nylon/plastic. It is alloy right?

the silver output shaft (alloy) the output cup that has splines on that fits inside the diff
Old 10-27-2005, 09:44 AM
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Default RE: fg diff and output cup movement

ORIGINAL: kengentry5000
It is alloy right?
I'd say it's grease.
Old 10-27-2005, 09:46 AM
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Default RE: fg diff and output cup movement

Mine has no give, it's the balldrives in the cups that slide in/out because of the suspension but the bolts should stay in place.
Old 10-27-2005, 09:47 AM
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Default RE: fg diff and output cup movement

Is the movement because the spline shafts are not inserted far enough into the differential? Some of the pictures I have seen of this unit show the diff cups much closer the the diff housing.

Ken
Old 10-27-2005, 09:47 AM
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Default RE: fg diff and output cup movement


ORIGINAL: chevyman_de

ORIGINAL: kengentry5000
It is alloy right?
I'd say it's grease.
prob is the white grease from inside the diff - should i be able to move the output cup that far away from the diff,is there to much movement or is that how it is supposed to be.
Old 10-27-2005, 09:49 AM
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Default RE: fg diff and output cup movement


ORIGINAL: kengentry5000

Is the movement because the spline shafts are not inserted far enough into the differential? Some of the pictures I have seen of this unit show the diff cups much closer the the diff housing.

Ken
i can push the cups back in place - but they come back out with little effort.
Old 10-27-2005, 09:57 AM
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Default RE: fg diff and output cup movement

I just checked with a new Leopard. Yours has twice the play. There are little plastic plates that have to be inserted inside the drive cups on the diff side and the wheel side. Is it possible that you missed them?
Old 10-27-2005, 10:01 AM
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Default RE: fg diff and output cup movement

i not sure - only time i have removed the drives is to fill the boots with grease and to fit the new diff,i cant remeber every seeing plastic plates on the drives or in the boots - just the 3 bearings on each end
Old 10-27-2005, 10:26 AM
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Default RE: fg diff and output cup movement

i phoned rossendales said it must be the camber adjustment on the wishbones - or the arms are to long,with them been elcon you cant adjust them as much as the fg ones with turnbuckles
Old 10-27-2005, 10:34 AM
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Default RE: fg diff and output cup movement

Here you can see the inserts, they're actually more like rubber than plastic, and the recessed section inside a drive cup where the insert should go.

I think with that much play your camber would be way off. But it can't hurt to check.
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Old 10-27-2005, 10:41 AM
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Default RE: fg diff and output cup movement

i have not got those inserts in mine - do they come with the cv drive as standard or are they seperate items!,i have none in any of my 4 cups - there a chance of losing 1 but not 4,can i have part number for those - thanks
Old 10-27-2005, 10:45 AM
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Default RE: fg diff and output cup movement

They do come with the CV drives as standard. Part number is 7080/3, Euro 1.90 for a set of four.
Old 10-27-2005, 10:48 AM
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Default RE: fg diff and output cup movement


ORIGINAL: chevyman_de

They do come with the CV drives as standard. Part number is 7080/3, Euro 1.90 for a set of four.

thanks - i will order some with the leopard,bit advice on fitting if you can - when the model standing still and the arms are at the straighest point is that the position of the most play in the drives - or should there be more play when the arms are moved,how much play should there be overall at the straighest point - just so i know when i come to fit them.thanks
Old 10-27-2005, 10:54 AM
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Default RE: fg diff and output cup movement

Since there has to be at least a little play at any position and the play gets smaller when the a-arms travel upwards, just make sure that there is no binding when the suspension is fully compressed, and you're done.
Old 10-27-2005, 11:21 AM
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Default RE: fg diff and output cup movement

just cleaned out the drives - them rubber spacers are fitted - so it must be the elcon lower arms are slightly over sized that are causeing the gap
Old 10-27-2005, 11:33 AM
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Default RE: fg diff and output cup movement

I just cleaned and regreased the ball/cups and the cup bolts do not move side to side. Plastic pieces were inside each cup.
Old 10-27-2005, 12:07 PM
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Default RE: fg diff and output cup movement

Ok then, as long as you don't use 14mm square drives in rear, you can also put some shims/washers between the wheel axle's drive cup and the inner bearing to correct the play. Two normal washers for M8 bolts are approximately 3mm thick and should do the job. That's not exactly a correct replacement for the rubbers, just a band aid in case the inserts are not at hand.
Old 10-28-2005, 07:24 AM
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Default RE: fg diff and output cup movement


ORIGINAL: chevyman_de

Ok then, as long as you don't use 14mm square drives in rear, you can also put some shims/washers between the wheel axle's drive cup and the inner bearing to correct the play. Two normal washers for M8 bolts are approximately 3mm thick and should do the job. That's not exactly a correct replacement for the rubbers, just a band aid in case the inserts are not at hand.
i do have 14mm squares on the back as im also useing elcon alloy spiders on the wheels,the rubbers in both axle and drive cups are fitted - to shim the gap would take 3 washers on each axle to reduce the gap in the play,just dont think you should have to do that on £125 lower arms.

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