its a silly idea but....

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Ryder

Having a senior moment
Posts
6,616
Location
West Bedforshire
Kai came up with this reasoning earlier and while I know it must be flawed I can't think why....

He has freewheeling his series that would be used most of the time. The drive to the front wheels only being engaged when driving on slippery or dodgy surfaces.

"If that's the case", he said, "why not make the front diff permanently locked. Weld or pin it. That way as soon as I am driving on a slippery surface I have the advantage of a locked front diff as well as the centre one".

Now I know that he would be in trouble if he tried to use the 4wd while on tarmac but as for the rest of his reasoning I can't find the flaw.

Observations Please? Is this idea as silly as it sounds or does he have a valid idea?
 
He is not the first to try this. I have seen it done several times. It can work quite well, but the downsides are that on tight twisty off road sections, it can be really hard to control the front end. It also does not make a huge difference when going up a steep, slippery slope, as most of the weight is on the rear wheels, so the fronts still tend to lose grip.
 
this would be on his 109 though. It is not for competing in, but he wants to take it on slippery surfaces; laning and perhaps one day morocco. If you think it will work then it is worth trying I would have though. At the end of the day if he doesn't like it its only a few hours to swap out the diff.
 
this would be on his 109 though. It is not for competing in, but he wants to take it on slippery surfaces; laning and perhaps one day morocco. If you think it will work then it is worth trying I would have though. At the end of the day if he doesn't like it its only a few hours to swap out the diff.
Tell him to give it a go, but for ****s sake, tell him to never try and drive it on snow covered roads in 4wd.
 
Be wary that the weak little 10 spline shafts will not like being pushed hard a bit too enthusuastic on the throttle and a bouncy bit here and there in a laiden up 109 and the wee shafts will ping leaving you with 3wd and a metallic sworf in the diff that will destroy it if driven for prolonged periods.

Try it on an old diff. I personally think his cheapest stronger option would be an old jag rear end which had the salisbury diff and limited slip. Now that would be nice in the back diffs go from £50 - £250 s/h if you get a goodun for £50 your laughing.
 
I have a 10 spline centre here thats been welded up can show you how it was made it doesnt rely on just the welds to lock it.

I will be building and pinning a couple of diffs hopefuly within the next month using stronger ashcroft CWP's. Time is such a nightmare at the moment. One for my offroader and one for my 90 I have all the bits just need to make up a sturdy frame to mount a diffs on. The etxtra strain a locked diff has is massive I'd seriously have to think about pinning the diff aswell if it was to be locked solid to stop that 4.7 crownwheel flexing as they do when under loadsa strain.
 
Another option is to put FWH on the rear with a welded diff so rear can be locked up without the steering problems you'd get wit the front locked. Downside is you've only got single wheel drive on tarmac but I meet a bloke that had this set-up and reckoned he had no problems with it.

Don't know if I'd fancy trying it with the amount of road miles I do though
 
I have a pair of fwh 24 spline for my 90 kicking about. I plan on fitting my lock right front locker downside is its only 10 spline but hey should work well until I can replace it with a kaiser locker
 
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