Which Sierra Has?

[Guest DixieTheKid]

Can any one tell me if this Sierra even exists please. Regardless of engine (as long as its a 4pot)im looking for a Sierra/Granie with a 2wd MT75 box, 7.5" LSD diff and rear disc brakes? Could be pissing in the wind here i dont know? Help!!!

Edited February 20, 2011 by DixieTheKid

[Guest DixieTheKid]

Manual Box.......!

[Guest gixerboy600]

Can any one tell me if this Sierra even exists please. Regardless of engine (as long as its a 4pot)im looking for a Sierra/Granie with a 2wd MT75 box, 7.5" LSD diff and rear disc brakes? Could be pissing in the wind here i dont know? Help!!!

 

XR4I??????

 

2WD Cossie???

 

Not 100% sure though

[Guest haulie]

2 wd cosworth matches xr4i has 6 pot

HTH

Haulie

[zygoteer]

Hi

 

Someone on here is bound to correct me, but according to the Sierra data I have collected over the years, the only Sierras that used the MT75 were all the DOHC I4 variants (Sapphire) and some of the V6 variants (some V6 used type 9 box)

I have no record of any Pinto Sierrra using the MT75, so used the type 9 box.

 

Both the DOHC I4 4WD and the V6 4WD used 7" rear diffs (plus the 7" beam of course) - the 4WD boxes were of course the MTX75 which has an extra transfer box for the front diff.

The 2WD DOHC I4 used the 7" diff and beam (some with drums, some with discs) - I suspect there may well be some odd diff exceptions to this, as Ford often fitted a non-standard setup depending on the parts supply situation.

The 2WD V6 used the 7-1/2" diff and beam and discs.

 

I have been told that it is actually possible to modify by welding revised brackets to a 7" beam to suit a 7-1/2" diff, or even butcher a 7-1/2" diff to fit the 7" beam, but is a lot of hassle (you have to make very sure the diff is then square & centrally placed), , so why not do what I did .......

 

I used a mk3 Granada DOHC engine, MT75 box (cable clutch), and the complete rear end which uses the 7-1/2" diff and beam and discs - it also has the bolted Lobro joints which are stronger than the push-in type used on most 7" diffs.

The only snag I know of (not completed my build yet !) can be that they used a 5 x 112mm wheel stud pattern, which is not so common (it was only the later Scorpio that reverted to the 4 x 108mm wheel stud pattern that a Sierra uses)

It is of course quite possibe to change the hub to a 4-bolt flange if needed though.

I stuck with the 5 stud type and use Granada-Cosworth 16" alloys.

 

I have found that the advantage of a 7-1/2" diff is that if you can get a direct bolt-in replacement from a diesel Granada or Scorpio which has the 3.36 ratio, which a lighter car with DOHC (this engine shouldnty be revved past 6000 without big mods) will benefit from.

 

Hope this helps.

Tony

[speedtripledan]

i used a 2.0L GLX dohc hatchback On an H plate for spares that had the mt75 box and rear discs sadly not an lsd diff still looking for one of them that doesn't cost the price of a small country..

[Guest DixieTheKid]

Hi

 

Someone on here is bound to correct me, but according to the Sierra data I have collected over the years, the only Sierras that used the MT75 were all the DOHC I4 variants (Sapphire) and some of the V6 variants (some V6 used type 9 box)

I have no record of any Pinto Sierrra using the MT75, so used the type 9 box.

 

Both the DOHC I4 4WD and the V6 4WD used 7" rear diffs (plus the 7" beam of course) - the 4WD boxes were of course the MTX75 which has an extra transfer box for the front diff.

The 2WD DOHC I4 used the 7" diff and beam (some with drums, some with discs) - I suspect there may well be some odd diff exceptions to this, as Ford often fitted a non-standard setup depending on the parts supply situation.

The 2WD V6 used the 7-1/2" diff and beam and discs.

 

I have been told that it is actually possible to modify by welding revised brackets to a 7" beam to suit a 7-1/2" diff, or even butcher a 7-1/2" diff to fit the 7" beam, but is a lot of hassle (you have to make very sure the diff is then square & centrally placed), , so why not do what I did .......

 

I used a mk3 Granada DOHC engine, MT75 box (cable clutch), and the complete rear end which uses the 7-1/2" diff and beam and discs - it also has the bolted Lobro joints which are stronger than the push-in type used on most 7" diffs.

The only snag I know of (not completed my build yet !) can be that they used a 5 x 112mm wheel stud pattern, which is not so common (it was only the later Scorpio that reverted to the 4 x 108mm wheel stud pattern that a Sierra uses)

It is of course quite possibe to change the hub to a 4-bolt flange if needed though.

I stuck with the 5 stud type and use Granada-Cosworth 16" alloys.

 

I have found that the advantage of a 7-1/2" diff is that if you can get a direct bolt-in replacement from a diesel Granada or Scorpio which has the 3.36 ratio, which a lighter car with DOHC (this engine shouldnty be revved past 6000 without big mods) will benefit from.

 

Hope this helps.

Tony

 

That is exactly what i was thinking!!!!! How did you get on with the front hubs? Did you go with the 5 stud, if so how did you make up the front hubs?

[Graham B]

My Sierra sapphire 2.0 I4 DOHC efi had MT75 and 3.92 7.5" diff (not LSD). It also had lobro half shafts and rear discs.

Just fitted 3.62 7"" with lobros.

 

Graham B

[Guest gdc]

i know graham

[zygoteer]

That is exactly what i was thinking!!!!! How did you get on with the front hubs? Did you go with the 5 stud, if so how did you make up the front hubs?

 

 

Hi

 

I just used the Granada uprights/hubs with 5 stud fittings, but it is straight forward to change the hub to the Sierra 4 stud when you fit new wheel bearings.

A possible advantage of using the Granada hubs is that they can have the ABS sensor rings fitted, so I could decide to fit the ABS+electric servo, but not got there yet - haven't checked if there is room for it.

 

Re-reading my original reply, I missed out saying that the 2WD RS Cosworth Sierras did not use the MT75 box, but the T5 instead, which is unusual in a "Seven" kitcar as it is heavier/bulkier.

 

 

When you are looking for a donor look at the VIN plate before buying, because in boxes on the left hand side the engine code (and also the axle code) is marked.

For an EFI version you need to look for "N9", some are marked "N9A" to "N9E".

(the "N8" engines are carburettor types)

 

 

As I decided to stick to the standard EFI+EECIV ECU setup, I figured out the best one to go for was the "N9B" from a low mileage (63k) 1989 Mk3 Granada - as it is CAT-less this one produces the highest power of all the 8-valve DOHC engines. ( ... when it was new of course)

Also the EFI inlet cam is higher lift than the carburettor version.

 

The 16-valve "N3A" engines were only fitted to Scorpios.

Looking at the torque figures, I think the 8-valve engines are the better ones to go for in a much lighter car, because the max is very similar, but it is given at considerably lower rpm, which means that the initial acceleration at low speeds should be better.

 

I would advise avoiding the Scorpio 145 bhp 16-valve "Y5A" 2.3 litre DOHC as it has a dual-mass flywheel and is a taller engine with twin Lanchester balancer shafts in the sump, so shortening it for ground clearance is going to be tricky.

 

cheers

Tony