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Gearboxes


DavidC

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What is the difference between the Type 9 and the MT75?

Which cars were they originally fitted to, and what engines are suitable for mating with which g'box?

Is there any particular advantage to using one over the other?

Thanks

DC

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Type 9 were origianlly fitted to Capri 1.6/2.0/2.8, Sierra 1.6/1.8/2.0 and the XR4i

MT75 was fitted to - Granada upto and inc 2.9, sierra XR4x4, Sapphire/excort cosworth 4wd

The MT75 replaced the Type 9 - so is basically a newer development of the type 9.

Type 9 is good upto 200BHP, MT75 goes to 250ish i think.

Hope that helps

Dont know about mating to engines - sorry

cheers

Chris

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I understood that the MT75 weighed 0.59 cwt and type nine weighed 0.77 cwt but I could be wrong.  I is bulkier but that is because the casing is Ali to the best of my knowledge.

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but don't forget that the Type 9 is considerably narrower (IIRC the MT75 won't fit a narrow body Westfield) and there are much better options of ratios and 'gear kits' (Quaife and BGH straight cut close ratios etc.)  :cool:

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If you have a choice of MT75 or Type 9, pick the type 9. It will give you far more options for upgrades etc than the MT75, and it is guaranteed to fit, no matter what type of chassis you have................

As standard, a box from the Capri (I think.....) will have a slightly better 1st gear (it's still not much good, especially if you have a 3.9 diff).

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I understood that the MT75 weighed 0.59 cwt and type nine weighed 0.77 cwt but I could be wrong.

Is my maths right Type 9=38.5kg & MT75=29.5kg ?,thus saving 9kg with MT75.

(at last some good news re: MT75) :p  :p  :p

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My alloy cased Type 9 weighs 28.5 kg, which is about 4.kg less than a normal one.

However, the MT75 has an integral bell-housing so when comparing weights you need to add that to the type 9 weight.  If you're using a cast aluminium one then expect about, oooh, 4kg.  Cast iron is, however, 'kin heavy by comparison !!

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My 4 speed type 9 cast iron cased box weighs 22 kg  ;)

John

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And if you are considering an engine other than Ford, that would rule the MT75 out as you cant change the bellhousing.

Stu.

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I understood that the MT75 weighed 0.59 cwt and type nine weighed 0.77 cwt but I could be wrong.

Is my maths right Type 9=38.5kg & MT75=29.5kg ?,thus saving 9kg with MT75.

(at last some good news re: MT75) :p  :p  :p

I was speaking to a guy at tyhe XTR2 testing day at MIRA, and he said that he wished that he had fitted the type 9 instead of the MT75 as the MT75 seems to jump out of gear at high revs. I said that it was probably just a problem with that particular box. Has anybody had any similar probs with their MT's as I'm about to fit one to the Westy I'm building. ;)

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I get the general feeling that the type 9 is the preferred gearbox, but unless I’ve not read thinks correctly, the MT75 is lighter and can take more power, so apart from the fact that it’s larger have I missed something?

Does anybody know that is a safe level of power and torque that can be put though one of these, torque figure is more important to me as the engine I'm thinking of using can easily produce over 400lb?

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the engine I'm thinking of using can easily produce over 400lb?

how have you managed to fit a truck engine into a westie?

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Not quite a truck engine but…

Don’t laugh, I have a V6 TDI from an Audi A6 sitting in my garage, I’m exploring the possibilities of fitting it to a westie.

I’ve found a company that can make up a adapter plate and clutch system to mate it to am MT75 gearbox, they just made one for somebody who fitted an Audi 225hp engine into a westie, and since they shared the same original Audi Quattro gearbox all should be well, I hope ???

I’m sure I’ve just offended half of the forum by suggesting a diesel engine in a westie but I reckon it could be fun. I’ve been tuning these engines in VW/Audi’s for a few years now, and this is my latest thought to fit one to a lightweight body – hence a westie. Lets face it a 2.5ltr diesel that kicks out 260hp and 408lb should make for an interesting drive.

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Stick a type 9 in it. WHEN you break the MT75 with all that torque, you'll only be able to replace it with another one. Fit a type 9, and you will be able to find several gearset (and clutch) combinations that will both suit the power delivery, as well as be strong enough to get it to the road. I'd be careful about speccing the prop and driveshafts too................

There was (probably still is) a 1.8 Ford Escort mk3 turbo diesel engined Westfield about, christened "The Weasel". Haven't seen or heard of it for a while, but it seemed to perform well, and was getting 50-60mpg :0  :0

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Interesting, so you reckon a type 9 with suitable gear set could hold the power better than an MT75? Is that mainly to get the gear ratios? If so I was thinking of using the diesel set which has a first ratio of 3.61:1 and a fifth of 0.76:1, together with a final drive of 3.62:1 and slightly bigger wheels than normal should give a reasonable speed range, with a top speed of about 130 on 17” wheels, not ideal but possible.

No offence to an Escort diesel but I’m not sure if it’s fair to compare the old Ford 70hp diesel to the latest Audi engine which makes 180hp in standard form and which happens to be very de-tuned, hence by removing a few restrictions it now makes 260hp (on bench dyno) and by spending a few more pennies can make over 325hp/447lb (my last project)

Fuel consumption is not part of my aim with this project, although it is something I have thought about. A question for people, who have used the same engine in a donor car and a westie, how did does the fuel consumption fair? Does it go down due to a little more hotfooted driving or go up due to moving only half the weight?

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