Series III gearbox trouble? - Defender Source
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  #1  
Old May 24th, 2015, 10:25 AM
SeaCowboy
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Logan Mitchell
1975 Series III MOD Light Weight
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Series III gearbox trouble?

Howdy!
I have been on an excellent roadtrip in my newly restored 1975 Light Weight, having run over 600 miles from Dallas, TX, to Roswell, NM.
The transmission and gearbox have been smooth and quiet the whole way.
This morning, however, as I was leaving the house in first gear, I heard a very loud THUNK.
Now there is no power to the rear wheels, and the hand break doesn't hold.
When I switch to 4 wheel drive, have power to front wheels and hand break works properly.
I would guess that many out there have had this happen, so any advice will give me a head start to fixing the problem.
Thanks!
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  #2  
Old May 24th, 2015, 10:26 AM
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Derek Chace
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Rear half shaft broken most likely
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  #3  
Old May 24th, 2015, 10:33 AM
SeaCowboy
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Logan Mitchell
1975 Series III MOD Light Weight
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the shaft itself seems solid, and so do the U joints. will take another look, but suspect its something in the gearbox.
any other ideas?
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  #4  
Old May 24th, 2015, 10:40 AM
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The half shafts are housed in the axle. You are referring to the drive shaft.
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Old May 24th, 2015, 11:17 AM
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Rear halfshaft broken
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Old May 24th, 2015, 11:27 AM
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gene
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Rear half shaft, you have to take off the outer drive flange and pull out the inner axle. Do both sides, then take out the differential and get the broken bit out of it. Clean out the diff housing and put it back in then slide in the replacement axles. You do carry replacement axles don't you......

If you drive it in font wheel drive you risk damaging your rear diff with all the bits which may be floating around in there. If that is your only option remove both half shafts and the rear prop shaft to minimize the diff turning.
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Old May 24th, 2015, 12:39 PM
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Charles Galpin
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The short side usually goes first. Pull that one and see. If you are lucky you can pull the broken part out with a magnet on a stick, and if it's a clean break just stick in another.
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  #8  
Old May 24th, 2015, 01:55 PM
SeaCowboy
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Logan Mitchell
1975 Series III MOD Light Weight
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Thank you Gents,
Now I know what to look for online....any suggestions?
Since this is a 1975 Light Weight and more narrow than normal Series III, would the axles have to be specific to Light Weights?
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Old May 24th, 2015, 02:28 PM
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Rob Wollschlager
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the shafts are the same as normal series II-III shafts, the lightweights do have different drive flanges, but that won't be an issue here.
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Old May 24th, 2015, 02:42 PM
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Don't start buying stuff until you know what's wrong though!
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  #11  
Old May 26th, 2015, 04:56 PM
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Logan Mitchell
1975 Series III MOD Light Weight
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According to the Gents at John Craddock's, the half shafts are specific to the Air Portable. But thankfully, still reasonably priced and in stock! I am pressed for time so have ordered the parts before taking the axle apart, so will hope for the best.
Will let y'all know how it turns out.

thanks again
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  #12  
Old May 26th, 2015, 11:12 PM
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Rob Wollschlager
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if you convert to normal series II-III drive flanges, then you can run normal series II-III shafts.
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