how can I tell a series 2 gearbox from series 1
 

Hi all. Looking to fit an lsd to my mk5 fiesta. Apparntly I need a series 2 as the lsd has an 8 bolt crown wheel. How do I know an s1 from s2 without opening it? Thanks

I think they both have different mountings . I think a S2 sits on a cradle under the box and a S1 holds the box from the chassis . The s1 has 4 bolts in a square pattern facing to the front of the car and the s2 has 2 gearbox mounts facing the floor underneath the box .

Series 1 on the left , spot the 4 bolt holes in a square . Hope that helps :)

Correct also a series 1 didnt have an lsd only a series 2 did and you can tell if its a standard box or series 2 box by lookking in where the drive shafts go

Thanks very much lads. Very helpful. Am I right in saying I need a series 2 diff for an ib5 with small machining to the crown wheel? And all series 2 boxes have an 8 bolt crown wheel?

Yes and if your getting a series 2 box look in driveshaft hole if you see a bar across middle of hole it DOES NOT have an LSD if you can see straight through with no bar inside it has an LSD

There's alot of peolpe selling box's as rst box's either because they think people wont know the difference(most dont) or because they hve removed it from there rst and genuinly dont realise its not the original rst box but a replacement as the box's all look the same and codes on the box's are all the same

I think your wrong there pal both the series one & two came with lsd's.
I think the series one had 6 bolts holding it to the crown wheel where as the series 2 had 8 bolts.

From what I've read it's the 8 bolt diff you want for fitting in to an ib5 well I hope it is as that's what I've got & want to fit it to lol

S1 rs turbos came with lsd. Stace

Thats incorrect, The Escort RS Turbo was the first front wheel drive road car in the world to use 'this' compact viscous-coupling design limited-slip differential instead of a normal mechanical limited slip differential.

Edit to add, agree with both posts above. Also to add the Fiesta RS Turbo did not have LSD.

Im not 100% sure all Series 2s had an 8 bolt crownwheel, as ive stripped a couple of series 2 gearboxes now and theyve had 6 bolt crownwheels...?

i'm sure it was only the s2's that had them.

EDIT: sorry not the late series1's it was the top spec series 1's that had it fitted

i think you right m8 only the s2 had them m8.

also my series 2 with zvh kept blowing box's in the end i got a series1 box and had my lsd/crown and final drive put in it (series 1 box) and it had no lsd in it and was off a B reg series 1

every s1 came with a lsd box wes

As above, every Escort RS turbo Series 1 and Series 2 came factory fitted with a LSD irrespective of spec, Fiesta RST's of course did not.
Yes you will need an 8 bolt LSD which is from a S2 box.
I've never found a 6 bolt one in a S2 box but if Roger has then there's a chance you might have to strip a couple to find one, could be that a S1 gear set had been fitted to a S2 casing maybe? Anything could have happened over the last 25 years! :cry: lol

Wasn't a S1 box then mate, probably swapped out over the years.

Nope all S1 and S2 had LSD as i mentioned, the only RS turbo that didnt have LSD was the fiesta model.