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Subject Topic: Mk2 Transit diff ratios
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Message posted by spionkop on 27/7/2004 at 12:52pm
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Hello everybody. I'm new here and have just bought a Mk2 Transit based Motorhome of unknown parentage which is "in need of some TLC" as the advert said - more like something between TLC and major surgery - e.g. deathtrap wiring, non functioning gas boiler. But am I downhearted? Of course not. It has a 2.5 Di engine fitted mated to a 4 speed gearbox. There are a couple of questions I'm hoping someone might be able to answer. Firstly the diff. The van is a twin wheeler with a Salisbury type diff with a very low ratio. There is no tag on it, so I don't know the ratio (I may jack the wheels and count the revolutions to find out). I do know that over 50 mph is a no-no and 45mph is more comfortable and quite steep hills can be taken in 3rd gear with ease. What optional diff ratios are there to get me to my destination slightly quieter and quicker? (I would be happy with 55-60mph) Secondly, the gearlever "sizzles" loudly over 30mph. Someone in the past has stuck some hosepipe over it to dampen it down a bit, but you're still best off driving with your left leg cocked over it. I think I'm at severe risk of "white-finger" (or is that white-toe in this case?) Is it the cup where the gearlever sits in the selectors that is worn?  Well, any info will be extremely useful (even if just "hello") so thanks in advance!


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Message posted by dickydooda on 27/7/2004 at 2:13pm
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Hiya,

I'm afraid I dont know much about the gear boxes but I have also just bought a Mk11 Transit camper which the guy had adapted by putting in a 5 speed sierra gearbox..Maybe you could do something like that.?

Happy Muckin'

dickydooda


Message posted by spionkop on 27/7/2004 at 2:59pm
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Thanks for that. I must admit I've just been talking to an ex Mk2 transit owner who reckons it's easier to change the whole axle than a salisbury diff. Not what I wanted to hear! I think the 5 speed option might be a better idea at the risk of infinite fun and games with propshafts. Ah well......

Message posted by the roadrunner on 28/7/2004 at 12:26am
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Hi Spionkop,

With the 4 speed box, it does have a 'loaded' lump on the gearstick, ( a weight) to prevent just what's happening, the sizzle you describe, but it does also sound as if the selector may be loose on the top of the box if you're having to hold it in using your leg.

It's a simple matter to check though. Lift up the gear lever gaiter, which is normally held down by an oval plate held with self tappers. Push it up the lever so you can reach down to the top of the box, and you will find a domed top with the lever going through it. The top may have 'unscrewed' so using a rag, grip the dome and try to turn it clockwise and screw it down fully. Put everything back and try it again on the road. It should make a difference, as the selector end will be pushed down into the 'gate' again.

Changing to a 5 speed box will also mean obtaining a different speedo drive gear, as the ratios will be different from the 4 speed. They are colour coded by the way, but don't ask me which one you'll need, as it's complicated.

The best man to ask about axle changing would be Billybun, who no doubt will see your enquiry in due course. he's 'our expert' on such matters.

Good Luck.

Bill.



Post last edited on 28/07/2004 00:27:49

-------------
The Roadrunner
                          Old Campervans never die, they get rebuilt ...eventually !

Message posted by spionkop on 28/7/2004 at 9:21am
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Thanks for that Bill. I'm going to be stripping the front carpet out imminently, so I'll have to take the gaiter and its retainer off to do it and have a look then. That'll be good if it cures it - my leg and ears will forever owe you a debt of gratitude!

 

Cheers,

Mark.


Message posted by billybun on 30/7/2004 at 3:26am
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hi spinkop,hope you are well,it is easier to change the whole axle as everything is allready set up on a twin axle,but it can be done by changing the diff and pinnion,and seals,the ratio is stamped on the diff,if you unbolt the backplate,collect the rancid smelling oil,,Have an assistant turn prop,take a torch,as prop is slowly turned look on side edge of diff for ratio,very rarely its stamped only on the pinion.if your going to remove diff and pinion,crack the 27mm nut holding flange to axle first,save you some swear words when removing pinion.get rid of the 4 speed...Fit yourself a mt75, ok you will need to cut and plate the cab floor,you will need a early mk 3 transit crossmember,you will need to get the prop off a mk 3,it will need shortening,but well worth it in the long run if you plan to keep your motor long term.i have a 80ps transit di matched to a 5 speed mt75,and mk3 axle and it will sit on the motorway at 70 all day long,before that it was a 2 litre 4 speed petrol ,it drank fuel and was useless,died on slightist hills,......5 speed and mk3 axles i recomend is the way to go..........The four speed boxes wear in the selecters,theres a plate on the side of the box which the stick screws in via the top, you simply unbolt the plate,find a good replacement,clean of old gasket,fit new gasket ,rebolt,check the spring on the base of the stick is connected to hold plate,this also helps prevents stick from the annoying vibration ........hope this helps....... very best wishes billy in brum ........


Message posted by spionkop on 30/7/2004 at 9:22am
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Hi billybun, I am well thanks. The latest is I have managed to acquire a cast iron cased 5 speed (type 9 is it?) as I thought it would be a bit easier to fit - roughly the same length and still a sliding yoke. Are they not as good as the MT75 box? I don't know the vintage of the engine and don't know how to find out. I'm wondering if it will still need a diff ratio change even with the 5 speed box, but not sure if it the engine will pull it assuming it's an older di engine and less powerful?  Well thanks for the loads of info. Best go and find my jack now.....

 

Cheers,

Mark


Message posted by billybun on 30/7/2004 at 12:28pm
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good morning mark,the 5 speed cast are unreliable,the first and reverse gears pack up on them,i have 2 sitting in the garage if you ever need another,you will need a different crossmember ,its called in the trade .......THE HORSESHOE crossmember as it has a horseshoe shape on the rear as the box mounnts 3 inchs further back than the 4 speed,dont attempt to modify your 4 speed crossmember as it will lift the box to high and put the prop at a angle ,causing rapid wear and the propwill tap on the chassis cross member when braking a bit heavy.the early di,s have plenty of power, if its a bosch pump you can open it up to make a race horse,but our ole campers are basically commercial motors of the day and 60 mph is quite reasonable speed to travel at ,the mt 75 is a good strong box and  nice and smooth,the 5 speed cast has wide gear changes know as the puddin basin box,it uses a skeleton bell housing to lessen the weight of it.try the extra gear before you decided on axle change,its quite surprising what difference a five speed box makes,.....your engine has a code stamped on it .it may be aa,ab,abb,aba etc,if you look about the block you will find it in a few places ,let me know and i will be able to let you know if its 70,76,or 80 ps ....many 80 ps are fitted with a basic turbo,the later ones being engine managment controlled,.......best wishes billy in brum


Message posted by the roadrunner on 31/7/2004 at 12:16am
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Hi Mark,

Well there you go .

I told you that Billy Bun was the man to answer your questions eh ?

Stick with this site and you won't go far wrong mate. 

How are you Billy ? I see you've been 'away' for a bit, as has Tony and Tracy. We are 'stcuk here, waiting for a replacement manual for the Mk 2 to appear after I got one off Ebay, as I need the wiring colours for the headlights, so I can wire in a pair of driving lamps.

I know that the answer is somewhere in all these messages, but I can't find the message. 

We'll be stuck here anyway until later next month, due to one thing or another, so, no worries.

 

Bill.



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                          Old Campervans never die, they get rebuilt ...eventually !

Message posted by msmo on 31/7/2004 at 12:27am
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HI There Spionkop

Are you another Saffer or a Boer War afficienado?


Message posted by spionkop on 31/7/2004 at 9:50am
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Hi msmo. No I'm not either! It's the name of my house and something I will remember easily through association. The house was built at the time of the battle so that could be why it's called as it is, but also living in one of the cotswold valleys probably the "side of a hill" connection has something to do with it.

Hi Roadrunner, yes the man has the answers. I guess the MT75 box is the way forward ulimately. I'm going to be going away in the van in two weeks so I've got to get my backside in to gear and get the gearbox I have got in before then (and the million and one other things to do to it). This is my first trip in it so I'm bound to make a load of mistakes. Probably heading towards the Gower and then on round into Pembrokeshire. Just watch for a trail of steam from that direction!

Best wishes,

Mark.


Message posted by the roadrunner on 31/7/2004 at 11:34am
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Hi Mark,

Yes Billybun has all the answers.

The MT 75 is s good gearbox, but as Billy says, if you get one, don't forget the crossmember too, as it will make the job a lot easier.

Good luck on your travels, and have a great time on The Gower. Tenby is a lovely town too, we head for there whenever we're in Wales, after a few days in Monmouth, which is normally our first 'real' stop off.

There's a nice little site in Monmouth just through the Monnow Bridge, turn right at the roundabout, and it's about 75 yards along on the right, between the houses, and right beside the river. Handy for the wife to walk into the main street and explore all the charity shops, if she's anything like our Ada.  Very near to the Green Dragon pub too, which is just across the road from the site.

Bill.



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The Roadrunner
                          Old Campervans never die, they get rebuilt ...eventually !

Message posted by spionkop on 13/8/2004 at 12:44pm
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So here are my observations to date. I haven't worked on a Transit since my old Mk1 I converted first to a V6 Essex and then an RS2000 Pinto engine. That was 20 years ago. You know it didn't hurt quite so much after, I seem to remember! Any way. I found the 5 speed type 9 box is 1 1/2 inches longer than the 4 speed. It has a completely different gearstick. The Mk3 crossmember I used needed the 4 mounting holes drilling in it, even though it was the right width, and even though it is bent lower to take the lower gearbox tail mounting, I still had to pack it down a bit to make the box clear the underside of the floor. The bellhousing, although looking identical externally, has a different bolt pattern when joining to the box (4 holes on the 5-speed, 5 holes on the 4-speed!). Had to get another one. In fact, I got the stick, crossmember and bellhousing from "Ford Only" breakers in Swindon. Not particularly cheap, but had it all ready to go.

I was shocked to find all the bellhousing bolts were merely finger-tight, and the starter motor bolts as well. Do they shake loose as a matter of course on di's or was the previous "mechanic", how shall I put this politely, "careless"?

So it's almost all back together. Mate is fitting the shortened prop fo me today and attempting to get the remaining starter bolts in (that metal plate between the engine and bellhousing is a *£&!"£ nightmare!).

Going to Pembroke in it tomorrow, hopefully. Quite a long "test run".

Being new to all this, I must ask, when you park at a pitch and then want to travel somewhere away from it in the day, how do you "mark you territory?" I'm just worried the site owners might inadvertantly think I've gone and give it to someone else. Am I being paranoid?

Best wishes to all, sorry for waffling on!

Mark.


Message posted by the roadrunner on 13/8/2004 at 1:20pm
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Hi Mark,

To keep your pitch 'reserved' don't leave your hookup cable or anything else valuable to keep your place. Somebody is likely to nick anything valuable.

I have just made up a small plaque, about 12 inches by 6 inches from 5 mm marine ply,  with "Reserved for ******** " wrote on it with permanent marker pen. I have fastened a short stake to that, so I can bang it into the top end of the pitch.

It works every time.

Enjoy your weekend.

Bill.



-------------
The Roadrunner
                          Old Campervans never die, they get rebuilt ...eventually !

Message posted by spionkop on 13/8/2004 at 3:12pm
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Cheers Bill,

   that sort of information is absolutely invaluable. I shall attempt to fashion something similar before tomorrow.

Thanks again,

Mark.


Message posted by billybun on 14/8/2004 at 2:57am
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hi mark,did you get chance to read my thread above about conversion before you started,the horseshoe crossmember would of saved you drilling and packing ,it fits straight on in the correct place,correct height,did you get a skeleton bell housing with a hole in the top for the 5 speed box reverse pin?anyroad it sounds like you will get a good result,well done,keep at it and you will soon be there,....very very best wishes billy in brum ............ps dont forget to fill the box with oil



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