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#1
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How to fit an LSD in a W108 4.5 rear axle?
Hi all,
I took apart the W108 rear axle I got recently and everything looks in good nick. The sliding sleeve was cracked but I got a good one out of a 250 rear axle. I was wondering what it involves to fit an Limited Slip Differential. Is it just a question of adding some parts to the exisiting differential, or are elements different? Thanks in advance |
#2
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My data shows complete center section has to be changed along with ring/pinion.
Cases are the same, along with bearings. Take a close look at your casing where the spider pin is pressed into the cage...that is where they are famous for wearing out [ they oval the casing out at the pin holes]
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A Dalton |
#3
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Thanks! Ring and pinion also?
I would like to get one of these LSD centre sections, they must be hard to find. Are they specific to the 4.5 axle, or is it common with some other models? I looked at the casing where the spider pin is pressed into the cage and it looks OK. But I did not take the ring out and it is half under it. Is it obvious when its worn out, ie is the pin moving in the hole when pressing on the differential parts? Is the pin moving in and out, or is there something I can do to to make the play obvious if there is any? |
#4
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Doesn't the 300SEL 4.5 have LSD? If so, I have a rear axle from a 300SEL 4.5 that I pulled apart about a year ago.
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With best regards Al |
#5
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I don't know if they all had it. If it had one, threre must be a plate fixed somewhere warning on the type of oil to be used into it (with the word "Achtung" written on it). Alternatively you could check if both wheel shafts turn in the same direction when you turn the centre flange or one of the wheen shafts. If it has an LSD I'm interested. Let me know.
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#6
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If the pin holes are worn , you will see it ..
And if you buy one, the check is to lock the front flange from turning and see if there is a lot of backlash play at the wheel from the left side. All LSD have special oil warning tag .............
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A Dalton |
#7
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Where is the warning tag? I'll take a look the next time i'm at the shop.
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With best regards Al |
#8
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Metal tag on one of the axle tube mount holes
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A Dalton |
#9
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I'm pretty sure the center section would have to come out of a V8 car-3.5 or 4.5.
Quote:
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Tony H W111 280SE 3.5 Coupe Manual transmission Past cars: Porsche 914 2.0 '64 Jaguar XKE Roadster '57 Oval Window VW '71 Toyota Hilux Pickup Truck-Dad bought new '73 Toyota Celica GT |
#10
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There are two rear casings..the V8 had a casing with a large oil cooling tube...the smaller case did not have that tube , but both version were available in LSD.
However , you can not put the V8 parts in the smaller , non-tube case b/c the case is too small. Which case do you have??
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A Dalton |
#11
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I have the one with the tube. I also dismantled a 250 rear axle with no tube and the internal seem to be the same. I will put them side by side and compare.
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#12
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OK
So, you have both..now, try and put the guts from the tube one in the smaller case ...don't fit.
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A Dalton |
#13
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Yes, these V-8 parts are different from the six cylinders for sure. The bolt sizes around the pumpkin and the number of fasteners is the obvious clue. Inside the ring and pinion gears are different diameters also. The metal LSD tag is fastened to the casting bolts and is folded back so it is readable from the rear. No other obvious signs that it is a LSD.
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Joe Alexander Blacklick, Ohio 1964 220SE Rally (La Carrera Panamericana someday) 1966 Unimog 404s (Swedish Army) 1969 300SEL 6.3 (sold) 1969 280SL Pagoda 1973 280SEL 4.5 1974 450SLC FIA Rally car (standard trans) 1982 300D turbo (winter driver) 1986 560SEC 1989 Unimog FLU419 (US Army) 1991 300TE (wife) 2002 SLK 32 AMG (350 hp) |
#14
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OK, I compared the two center sections (with the differential inside) and they really look the same. The rings would interchange, the distance between the two bearings is the same ans the position of the ring between the bearings is the same. Size and number of teeth of the diff and side pinions look the same. Conclusion seems to be that if a 4.5 center section is damaged with some spider pin having some play, 250 or 280 can be donor cars for that ceter section as they are less stressed. Following the same rationale 250 and 280 LSDs may fit in a 4.5.
I also compared the right joint and they are the same, together with the sliding sleeve inside. Tomorrow I will try to see if the 250 left tube arm mounts on the 4.5 pumpkin. I found this on the internet: http://www.phantomgrip.com/catalog/index.php?cPath=40 This is supposed to transform a free diff into an LSD. Comments on internet vary from bad to good so I can't make an opinion. Anybody with some experience or first hand info on these? |
#15
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The point being made is the 4.5 gear assembly is too large to fit in the 250 case..a 250 assemlby may fit in the 4.5 case , and if your 250 and 4.5 look the same , that is what someone had done to your 4.5 b/c as the original 4.5 is way larger than a 250 .
See if the ring/pinions are 3:27 . Here is some info [ Great JA Video] http://video.google.com/videoplay?docid=6365474313884505435
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A Dalton Last edited by Arthur Dalton; 05-27-2009 at 09:53 AM. |
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