2.8 trooper engine into my 90 pics & progress (and headaches!)

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Cropsta

Member
Posts
61
Location
Manchester
Started off with loads of agro with my diifs, and also decided to fit my new engine while I've got it off the road,
Can anyone shed some light on this for me first of all ?? Got a 90 defender with 10spline axles.
My rear diff blew last week and I had to pull a half shaft out and remove my rear propshaft and put it in diff lock to get me home.
I've bought a new diff and put it in last night and when I tried to reverse it off the ramp it went tight and the front wheels was still turning the right way, but the rear wheels were skidding on the gravel and turning forwards. Now it only does this when its in diff lock, if I take it out of diff lock I was able to move it, I didn't take it out on the road and try it though as something is obviously wrong somewhere.
Are the front & rear diff the same ? Can they be interchanged? Front in the back and back in the front ??
That's all I can think about at this moment in time is the they spin in the opposit direction.
Or do I have a transfer box issue through driving it home in diff lock ?? This has happened before where I had to remove the rear prop and a halfshaft Coz my diff blew, but last time I didn't have any issues, it was just the case of putting the new rear diff in and it was fine.
I've just got it in my head that I may have been sold a front diff and this is my problem.
Any help / input would be great !
 
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Suspect you've put a 4.7:1 ratio diff from a Series in, instead of a 3.54:1 that coilers use. With difflock out you are just spinning the centre diff (don't drive it on the road like this, it'll break the centre diff).

Edit, front and rear diffs are interchangeable. Only way for the wheels to spin the other way would be from the transfer box. But hugely unlikely. Also if the front and rear wheels rotated in different directions it'd be almost impossible to move or drive.
 
Possibly what 300 says, or could simply be someone's changed a crown wheel and pinion in your existing front, or in the 'new' diff and they're simply mismatched.

I'd suggest dropping each diff out and counting teeth on the crown and pinion gears ..
 
Do both rear wheels do it at the same time? If one wheel is jammed / seized / stuck brakes then the opposite one will try rotating in the reverse direction. Jack both wheels up and make sure they rotate.
 
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Cropsta you've just about dun my F/in head in ! LOL
Bi chance you haven't put it in upside down have you ??
That would explain why fronts going back & backs going forward !
Or am I looking at it all wrong ??

Steve
 
Cropsta you've just about dun my F/in head in ! LOL
Bi chance you haven't put it in upside down have you ??
That would explain why fronts going back & backs going forward !
Or am I looking at it all wrong ??

Steve
Impossible to fit a diff upside down.
 
Never heard of it. Let us know when ya find out what's happened. Sounds like yer a bit heavy footed off road with the amount of diffs ya go through lol
 
Need more help/knowledge !
I know I've not fitted it the wrong way, in pretty sure it's impossible to do any ways as there is a slot in the bottom of the axle casing for the crownwheel to pass.
I'm digging into it and I think my defender has got 200tdi axles on it.
I know the diff I bought is out of a series Landrover. So guessing that's the problem.
Not really got time to pull both of the diffs out and count the teeth on the crownwheels.
But I counted the teeth on my old diff last night and it's got 46 teeth on it, Id really like to take the other one out and count the teeth on that but I'm not gonna get time today but need to get a diff sorted by Saturday afternoon at the latest ready for whitworth quarry on Sunday !
Can anyone tell me if that's a 200tdi diff I've taken out with 46 teeth on the crown ??
Maybe someone has got a series diff they could count and let me know ??
My diff went Coz one of the hub seals was finished and it let water in the axle, you wanna see the state of the wheel bearings I've taken out of it ! 2 diffs I've gone through Coz of that seal, I've never had the time to sort it tbh honest at I work in a garage and never have time to do anything to my own vehicles, (you no what they say about mechanics not repairing their own cars!!). Bought it in a sorry state for peanuts but slowly and gradually fix the bits over time, glad I got the bearings and seals done, the street is a ness off all the fluids it's leaks over night !
 
I'd say the series diff is the issue they are different radio I belive. If your running a rear 10 spline then you'll have to find another rear diff or maybe the rear stuff of a disco axle, does your have drum brakes at the moment? If not I think you can just get the shafts n 24 spline diff and pop it straight in unless you can find the proper diff
 
Front and rear diffs are interchangeable. If the handbrake is not seized then it must be a problem with the diff you just fitted. As already said if they are mismatched the centre diff will take out the mismatch but when you lock the centre diff the wheels have no option but to drag and skip. This is a sure fire way to kill the centre diff as it is not designed for continuous use in that way.
 
I'd say the series diff is the issue they are different radio I belive. If your running a rear 10 spline then you'll have to find another rear diff or maybe the rear stuff of a disco axle, does your have drum brakes at the moment? If not I think you can just get the shafts n 24 spline diff and pop it straight in unless you can find the proper diff

It's got discs on the back. , and if I put a 24 spline in the back, Wouldnt I have the same issue ? as I've got a 10 spline in the front ??
Pretty sure these axles are off a 200tdi
 
No the splines arnt the issue it's the ratio of the diff that's the issue. 24 spline you'll find alot quicker and easier I'd imagine as discos are being broken daily. I paid 80 for a full rear axle and put it on mine where as a friends we just took his half shafts and diff out and put 24 spline stuff in it
 
I run a 24 spline front and 10 spline rear, using Disco axles on my 90 .... We 'found' a broken 10 spline ARB diff locker, so fixed it, much machining and fettling, and made it work .. :)

It's the ratios ... defender 3.54:1, Series (111 109) 4.71:1 .......... You'd need a pair of series diffs, front and rear to make it work, or a pair of Defender ... The series diffs will make it quite rev-happy with slow top-end ... till you go downhill I'd guess .. ;)
 
The rear diff I took out has 13 teeth on the pinion, and 46 teeth on the crownwheel.
What ratio would that one be ?? As this is what I need to get to put it right.
Does anyone have one for me in the Manchester area ??
 
The rear diff I took out has 13 teeth on the pinion, and 46 teeth on the crownwheel.
What ratio would that one be ?? As this is what I need to get to put it right.
Does anyone have one for me in the Manchester area ??
3.54 ,the 4.7 diffs have 10 tooth pinions
foor the rear wheels to go in opposite directions prop or diff flange etc have to be locked so they cant turn
 
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