Thayne Posted June 22 Share Posted June 22 Seeking wisdom on what is wrong and how it works... After sitting for nearly 20 years, I am trying to get my 1987 110 County 2.5 Petrol (LT77?) running. With the vehicle on jacks, I have tried to get it in gear. The front prop shaft is spinning fine, and the Universal Joints seem to be doing their job, with no play. The front wheels, however, are not turning. My first thought was that it should always be engaged, so I should take apart the diff to see if there is something obviously broken. But then, I thought that the center differential must be communicating somehow mechanically to the front diff to engage diff lock. I have not figured out how they are communicating, and/or if there is something simple to get the wheels to engage with the prop shaft. I have not found any good videos or explanations of this particular aspect. Any thoughts? or can you point me to some good resources? Quote Link to comment Share on other sites More sharing options...
JohnnoK Posted June 23 Share Posted June 23 Does it have free-wheeling hubs fitted? Something like this... If so, they need to be engaged for the wheels to drive, but if they've been unused for a long time they can get sticky and uncooperative. If not fitted, the diff is possibly in need of repair. Quote Link to comment Share on other sites More sharing options...
Stellaghost Posted June 23 Share Posted June 23 A snapped half shaft would also stop drive as the diff turns with the path of least resistance. I would check diff and shafts regards Stephen Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted June 24 Share Posted June 24 On 6/22/2024 at 7:18 PM, Thayne said: But then, I thought that the center differential must be communicating somehow mechanically to the front diff to engage diff lock. There are no cross-axle diff locks as standard on these, only a diff & locking dog clutch inside the transfer case. If the propshaft is spinning, at least one wheel should be turning - as Stellagost says, a snapped shaft in the axle would let all the power spin out to nowhere. if you've got it jacked up, hold one wheel and try to turn the other - the propshaft should turn. If it doesn't, suspect the driveshaft or CV on that side. Pictures also help - we might spot something that you might not be familiar with. Quote Link to comment Share on other sites More sharing options...
steve b Posted June 24 Share Posted June 24 Another common fail point is the drive flange splines tearing out - an easy check , pop the rubber end caps off the drive flanges and repeat your original test to see if the drive shaft end spins. OEM flanges are my choice for replacement , most of the so-called hardened upgrade options are soft as a soft thing.... Steve Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted June 24 Share Posted June 24 3 hours ago, steve b said: OEM flanges are my choice for replacement , most of the so-called hardened upgrade options are soft as a soft thing.... I fitted Terrafirma ones as they were 15 quid a pop and have the screw-on end caps since the OE rubber ones kept popping off. Time will tell how well they last - they've been on for maybe 5-10k so far. Quote Link to comment Share on other sites More sharing options...
steve b Posted June 24 Share Posted June 24 The latest pair of those I replaced a couple of months ago had done about 25k miles according to the owner - 99% road use. If I can find one in the scrap I'll take a pic of it Steve Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted June 24 Share Posted June 24 I fitted Ashcroft probably 5K ago, will have them off at the weekend so will give an update on their condition. Quote Link to comment Share on other sites More sharing options...
Thayne Posted July 1 Author Share Posted July 1 Thanks for all the great advice! As you can see, the Right hand CV joint seems to have exploded, and the half-shaft was also dinged up. Working on replacing now, and will see if there is more damage elsewhere. 2 Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted July 1 Share Posted July 1 That will do it, for sure. 1 Quote Link to comment Share on other sites More sharing options...
Northwards Posted July 1 Share Posted July 1 On 6/24/2024 at 5:05 PM, Bowie69 said: I fitted Ashcroft probably 5K ago, will have them off at the weekend so will give an update on their condition. Not to go too far OT, I’d definitely be interested to hear what you think. I fitted these too, though I can’t say how many miles ago, as a ‘fit and forget’ option. I’ve been doing some long UK and foreign miles and expect to do more, so I saw it as another ‘peace of mind’ investment. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted July 1 Share Posted July 1 Didn't get them off in the end, perhaps next weekend, or the next(!) 1 Quote Link to comment Share on other sites More sharing options...
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