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GKN Overdrive Strip Down

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I contacted the guy ages ago and he never has stock. I have no doubt that it will help to add a larger capacity for oil. Plus a sump plug will speed up oil changes and make them easy to do regularly. David (Vulcan Bomber) on here is looking at making something similar. Discussion here:

 

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In my experience I don't think the majority of these GKN overdrives are robust enough for modern use. I'd certainly go Roamerdrive (alas hens teeth s/h, if one comes up grab it quick !) if I were to consider an overdrive again, a big investment for sure but proven to be capable and reliable.

Mo

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I think the recommended oil changes (50,000km) are a big reason for the failures. 750ml of ATF in there for that time..... Mine is on 100,000 miles with me now and it was secondhand when I bought it, so they can go on ok.

Agreed though the Roverdrive does seem like a more robust unit.

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Had a reply from Martin at D4x4, can't help with sprag outer ring or planet gear set, also spoke to overdrive -repairs, he hasn't got any sprag outer rings or planet gear sets in the housings either, looks like I'll have to scrap my GKN &/or look for a 2nd/3rd hand unit, or save up for the Roamerdrive unit.

just found this on ebay https://www.ebay.co.uk/itm/Roamerdrive-Overdrive-Unit-for-Land-Rover-Defender-90-110-130-DA9017/202371073807?hash=item2f1e41870f:g:yRUAAOSwgmJX1br~ glad I was sitting down when the price appeared. :o

 

my GKN was bought 2nd hand from a fellow 110 owner on the old LRO site quite a few years ago, it's had a good run. according to my original fit photo's I bought it June/July 2005. IIRC it had approx 10,000 miles on it then. 

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13 minutes ago, western said:

glad I was sitting down when the price appeared. :o

Even though mine was a total bargain I have to say for £1600 brand new I'd buy it again without a second thought. Especially after seeing the pics in this thread :ph34r:

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been digging up dates/mileage. fitted july 05, removed Feb '17, been on 110 for 117402 miles but obviously not engaged for all that time. 

there's one GKN unit on ebay in germany for over 1700 quid, but think I'll save up for a roamer unit instead. quite fancy a 3rd gearlever to play with :)

 

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I think Neil (V8Freak) may have a surplus GKN now that he's auto, might be worth a pm Ralph.

Mo

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Western Ralph,

There's a s/h roverdrive for sale on a french (non-specialist) site for 850€... I've pm'd you a link and can liaise if needed....

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The Roamerdrive is good, but it's no silver bullet.  I don't know about later units, but early ones had cheap bearings that were not quite true in mine.  They're very susceptible to low transfer box oil levels and hard to rebuild if that does happen (guess how I know).  On the plus side,  all I had to do was replace the failed bearings (no loss, since they were already horrible) and have the sun shaft bearing surface turned and sleeved.  To withstand what it did and be so simply repaired (ignoring the physical difficulty of parts of the job) is testament to its overall ruggedness.  Just watch the oil level! 

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Already had a PM from Mr V8Freak ref his dormant GKN unit & a PM from Giles about the other OD on the french webpage, Thanks both, PM's have been replied to. 

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just to update this, I bought V8Freaks unit from him & managed to get one of these bigger sumps [waiting on delivery] http://maximum--overdrive.com/products.html

Deep Sump,

Larger than any other on the market.  It will work on J&P type overdrives.  Will increase oil capacity and cooling.  Recommended for heavy duty applications. 

 

Picture011.jpg

Picture010.jpg

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Hey! That's mine, it's even got my name on it ! 😂 

Mo

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48 minutes ago, Mo Murphy said:

Hey! That's mine, it's even got my name on it ! 😂 

Mo

:rofl: No it's mine, or at least the one I bought is. 

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15 hours ago, Mo Murphy said:

Hey! That's mine, it's even got my name on it ! 😂 

Mo

Turn it the other way around and it has Nige's middle name -"ow"!

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  • Haha 2

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On 12/15/2018 at 10:53 PM, western said:

just to update this, I bought V8Freaks unit from him & managed to get one of these bigger sumps [waiting on delivery] http://maximum--overdrive.com/products.html

Deep Sump,

Larger than any other on the market.  It will work on J&P type overdrives.  Will increase oil capacity and cooling.  Recommended for heavy duty applications. 

 

Picture011.jpg

Picture010.jpg

Be curious to know if it retains the small gauze filter and whether the oil pickup is extended into the sump or not when you get it Ralph. Also whether it still has a magnet glued in there as I find mine does catch some fine particles. The fella selling these wasnt that helpful when I contacted him previously - didnt seem to know when he might even expect stock!

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He had this in stock, but it's taken me nearly 3 months to get hold of this item, he doesn't work at these as a fulltime job, my first email was on 19 Oct, my last reply from him was 15 Dec, had to extract the parcel tracking number from him as well, customs charges were paid this morning & I'm expecting delivery tomorrow, if it comes after 11.30am, [ I'll be at work after]  then I'll have to collect from post office on Weds morning. I'll add some photo's of the inside when I get my grubby mitts on it.

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Well it's here.  photo's because you all want to see the item, 

the bigger sump has a drain plug which has a inbuilt magnet, also comes with new longer bolts/spring washers & gasket, just found out what the short tube is for [to extend the gauze filter into the deeper sump, Thanks to soutie for the link above, a few posts on that link are corrupted, but it gives a good idea of  how it fits.

IMG_20181219_101048.jpg

IMG_20181219_101058.jpg

IMG_20181219_101138.jpg

IMG_20181219_101208.jpg

IMG_20181219_101213.jpg

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I think this will be a very worthy addition to the GKN. I have no doubt this will help reduce wear and also make maintenance easier with the drain plug!! I plan to fit something similar very soon hopefully. Even so, I would still recommend changing the ATF at every engine service.

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Fitting of the 'new to me' GKN & this sump will be a 2019 job now, when we get a good dry weekend.

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