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[bellers]

im on the look out for an lsd for my mv6 and have came across a carlton one a boy mite be selling if he cant get his car sorted.
as far as i can see these can be used but have to be built into the omega casing. would this be right?  secondly is this a big job and is there a guide anywhere?

thanks
jonny

[2woody]

not a big job to swap the crownwheel carrier from Carlton diff to Omega diff.

BUT you need to shim the diff right or it'll howl like a howly thing.

and that's no guarantee that the plates still grip, or what locking factor it's got.

[fastcav]

Would a carlton diff not fit as a direct replacement for a 2.0 16v diff? I know from past problems that the wee 4 cylinder omegas used smaller half shafts, albeit that it was just the outer cv joints and flanges were smaller, but also they used a smaller prop shaft as well, which in itself bore a remarkable resemblance to a carlton unit, and since the rear cradle is essentially lifted straight from a carlton, it should all bolt in ok. The inner cv joints all seem to beof the same size, ie i ran 2.0 16v rear cradle, shafts and hubs, but an mv6 diff in my c20let omega for ages until i changed the rear cradle to a v6 item. The only problem i could forsee would be that if you were using carlton shafts that didnt have abs rings on them, you would have no speedo and a nice little orange light on the dash (abs obviously) to keep you company on a dark evening. I know of a couple of hooligans that fitted omega diffs to carltons, myself being one of the instigators, and from memory it involved little or no modification at all, but i never tried it vice versa. Alsoif i remember correctly the carlton lsd is a plate type diff, and they wear out if not serviced correctly, whereas the omega mv6 diff is a viscous or torque bias diff (not an lsd) which require little more than the correct grade of clean oil to functiion correctly

[bellers]

Would a carlton diff not fit as a direct replacement for a 2.0 16v diff? I know from past problems that the wee 4 cylinder omegas used smaller half shafts, albeit that it was just the outer cv joints and flanges were smaller, but also they used a smaller prop shaft as well, which in itself bore a remarkable resemblance to a carlton unit, and since the rear cradle is essentially lifted straight from a carlton, it should all bolt in ok. The inner cv joints all seem to beof the same size, ie i ran 2.0 16v rear cradle, shafts and hubs, but an mv6 diff in my c20let omega for ages until i changed the rear cradle to a v6 item. The only problem i could forsee would be that if you were using carlton shafts that didnt have abs rings on them, you would have no speedo and a nice little orange light on the dash (abs obviously) to keep you company on a dark evening. I know of a couple of hooligans that fitted omega diffs to carltons, myself being one of the instigators, and from memory it involved little or no modification at all, but i never tried it vice versa. Alsoif i remember correctly the carlton lsd is a plate type diff, and they wear out if not serviced correctly, whereas the omega mv6 diff is a viscous or torque bias diff (not an lsd) which require little more than the correct grade of clean oil to functiion correctly

strange that you say that as when i had bald tyres on i was convinced there was an lsd in it because it done donuts in the wet but now i put new tyres on it doesnt seem to want to even slide coming out of a corner then all of a sudden is seems to lock and throws you the other direction and i can do donuts.
is there anyway to tell if its an lsd with out opening the diff?
could it be that the diff just need new oil with lsd additive and reshimed?

[albitz]

Jack up one rear wheel and try to drive the car- if the wheel which is up in the air spins, you dont have an LSD. If the wheel on the ground rotates and the one in the air doesnt( and probably drags the car off the jack, so be careful) you have an LSD.

[fastcav]

Safer method, jack both rear wheels off the ground, put rear of car on axle stands and release handbrake. With the engine off pick one of your rear wheels, it doesnt matter which one, and rotate it, whilst looking under the car at the wheel on the other side of the car. If the other wheel is turning in the Same direction you have an lsd, but if it is turning in the Opposite direction you have either and open diff or a viscous type diff. And on the subject of wheel spinning and donutting, my old mv6 quite happily diffed around a PRIVATE car park beside antrim lough, with an open diff and who flung dung remoulds, if youve got the power you will lock the diff anyway. Driving on skinheads you have less restistance between the road and the tyre, hence the reason your car would hoop so easily,because it was easier for it to spin the wheels. But at the same time, under hard braking you would have noticed the abs kicking in with less effort too because the wheels would lock easier. I'd weld the diff if it was mine, but at mot time, i find the little monkeys in their blue suits have sense of humour failure when they try to do a brake test, the look of confusion on their wee faces is priceless

[fastcav]

 And more to the point, why does your mv6 not already have a diff, was it civilian spec or an auto?

[2woody]

a few things wrong there....

All Omega A (Carlton) and Omega B LSDs are plate-type.

The Carlton diff casing is not the same as an Omega diff casing - Carlton connects via 4 vertical bolts into the top of the diff casing, whilst Omega has one bolt front-rear onto the subframe, and rubber bushes on the rear cover.

The Carlton rear cradle is not the same as an Omega rear cradle. Carlton has two front donuts and a block bolted to the diff rear casing, whilst Omega has two horns on the rear cradle to mount to the car - Omega has a diff which isn't solidly mounted to the cradle.

Carltons had two basic diff designs, a small one and a large one, but the small one is of no use because there weren't any made with LSD - and they were only fitted to 4-cylinder saloons.

Omega MV6 only had LSD as a very expensive and difficult to get special option. No standard Omegas ever had LSD.

there's no real way to tell if its LSD without opening the diff - but it's real easy popping the rear cover off for a look-see

[bellers]

Thalks folks I will jack up backend tomorrow when fitting steering idle arm and post up my results.

Fastcav. Antrim lough? Then your local to me. I'm just outside antrim. I don't fancy welding it up tho. Will have ma we girl in car and wouldn't trust it

[fastcav]

yeah im on jon44 as gordiesideways, used to take my young fella to the diffs at bohill back in the old days, if your driving with a bit of sense about you a welded diff is no worse than an lsd, contrary to popular opinion. Most people who complain about them being dangerous are health and safety idiots who usually have never been in a rwd car never mind piloted one with a welded diff. My mum used to love my volvo 240 estate and it had a delded wiff  8-)

[bellers]

welded is not to good for turning parking etc. mates sierra has one and wouldnt be a fan of the 3 point turn

jacked car up tonight. wheels spin in opposite directions, so will have to look out for an lsd

[fastcav]

Will keep an ear open for ya mate, somethings gotta turn up

[2woody]

jacked car up tonight. wheels spin in opposite directions, so will have to look out for an lsd

you'll still get that with LSD 

[bellers]

Ill just have to open it up and find out. Seems to be the only way to be sure

[fastcav]

jacked car up tonight. wheels spin in opposite directions, so will have to look out for an lsd

you'll still get that with LSD 

Not with plate type diff you wont, unless there not a plate left in it