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#1
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Srt8 diff in r129
I'm waiting on pistons for my turbo build, so I started looking at limited slip diff options.
I'm out of town getting ready for Monterrey car week, and can't compare my diff. I've checked out tons of online info and pics and compared, but I think this diff will bolt into my r129, may need to swap my backing plate. What do you guys think? Any experience? https://m.ebay.com/itm/2008-Dodge-Charger-SRT-8-OEM-3-06-Rear-Carrier-Differential-Assembly/392072381293?hash=item5b4955c36d:g:ZUYAAOSwdu9aoDpt&_trkparms=gclientid%3DjWn7ftXr41Z4I0IfTNfVKU4qCH4fK2yywX9mozV8E9jLDZ6io-Ny3DZ2sXUU68_x&_trksid=p2489528.m4335.l8656 |
#2
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#3
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I have a complete rear end assembly from a 1999 SL500 for sale on ebay right now. The casings do look similar but not exact. The SL500 gear ratio is 2.65:1 and it 'might' be an LSD as the backing plate has the fins that you typically see on LSD diffs.
Here's a link with pictures should you want to make your own comparisons. https://www.ebay.com/itm/122834150353?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649
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With best regards Al |
#5
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Quote:
The R129 never came with LSD, it used ASR ( Acceleration Slip Regulation ) . Also, there were many different diff sizes and axle lengths in the R129 so be sure to do some research to see what you have right now before looking to replace it. |
#6
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Looks like it might fit with a back cover change. But fit and work are two different things. If you put it in your transmission will go into limp home mode because of the gear ratio change. And I don't know what it would do to your ESP. You would have to install a two channel speed changer on the input of your transmission control unit or get an aftermarket controller from PCS.
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To see my 129 parts for sale visit: http://stores.ebay.com/The-Mercedes-SL-Store John Roncallo |
#7
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The 215mm does not just fit. I am retrofitting one to the w124. It is the same case as the C63 and others of that size/era. It will fit but requires custom rear cover and or custom rear subframe work. I tried about 3-4 different rear covers. Maybe there is one that works but I could not find it.
Unless you are planning on doing a wheelie the 210mm diff is more than up to the task. The axles are the week link and they start breaking around a 1.5ish 60' at the race track. Any ways I have a thread on here about the setup I am doing. |
#8
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No esp on this car, and everything will be stand alone. I'm sure my abs will be out the window too but no big deal on that.
Not to worried about the strength of the current diff, especially with automatic car. But would like to keep to a steel cased diff, aluminum start to spread on high hp srt cars is what I'm reading. But a wheelie would be fun to see in 129. Good to hear they can handle down to 1.5s, I've never gotten under 1.8s in any of my other cars, all sticks. Main concern is lsd and changing gear ratio. Does the diff fit the space? Does the front single mount line up? This will not be a daily driven car, could the subframe mounts be filled in new holes drilled in subframe for a direct mount, no rubber? Thanks guys Bonus saleen mustang carnage pics, rear end and axle giving out way before 1.5s lol |
#9
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Quote:
ABS ( Antilock Braking System ) modulates brakes in responce to a wheel being locked under braking. ASR ( Acceleration Slip Regulation ) modulates throttle then applies a rear brake if a REAR wheel continues to spin at a rate higher than the front wheels. ESP ( Electronic Stability Program ) is a system that applies any of the 4 brakes in an effort to prevent the car from flying off the road in a corner. ESP isn't very common on the R129 as it was an option on some cars, it was however , standard on the 600SL / SL600 Each system has elements of the one before it, all use the ABS pump / valving system / computer. ABS ABS + ASR ABS + ASR + ESP If you have a black switch with a chained snow tire ( in the hazard switch area ) , you have ASR. Quote:
DSS makes plug on / CV bolt on flanges for the 8.8 as well as custom axles. The R129 has painfully small wheel side splines. I looked at a larger( W140? ) upright / hub bearing / spline but the pickup points are completely different and there isn't enough material to grind the hub for the small R129 bearing and the upright doesn't have enough material to use a larger bearing. For what you want to do, I'd be even more tempted just to use a complete IRS subframe from a Ford or go to straight axle. |
#10
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Like I said. I have a thread on here on details on rear end upgrades for these. I go over all of this.
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#11
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I looked at some ford units, they do look very similar. Solid axle and tubs may come eventually lol
Sorry whipple, I kept reading the qualfie thread and didn't see the driveline upgrade thread. Now that I've read it.......... wow you are the man. The work you've done is incredible. I hope to be able to follow that exactly. What car did that diff come from? Is that the diff your putting the qualfie in? I'm hoping to use an 09 and later for the factory lsd. It's a popular swap to put in the older srt non lsd cars so I suspect the casing should be similar in dimensions, but the axles are different on the 09+ 226mm diff. Quote:
Can I use the large w140 axles with the clk BS wheel hub? Then just do a wavetrac or qualfie and gears on my stock r129 diff? How much lower (numerically)could I go with my case that has 3.69? Can I get to the low 3s I'm sure this has all been covered but it's so much to take in |
#12
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Quote:
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At high loads, the hubs internal spline will try to expand, this could expand the bearing's inner race causing the bearing to fail. With so little material where the flange transitions to the bearing, the hub could break off leaving the spline and nut still intact. Attached are some bearing sizes. |
#13
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I just noticed something. . .
The large S class bearing ( 41235000 ) was supposedly used in some 98 - 03 E320 ( I'm guessing wagons W210 ) The small bearing ( 41290005E ) was used on some 94 - 03 E320 W124 / W210 probably just sedans. With all of this there may be a possibility of a large spline / large bearing upright that will fit a R129. car-part.com does not show a direct interchange but that could be from a brake shield or caliper mounting. |
#14
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The problem with using off the shelf axles is the length. It just so happened the c63 axles were close enough form my application and that I was also widening the rear track a bit. I have spacers on my wheels and then with the wider rear end setup I can take the spacers off.
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#15
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The 140 axle fits 129 diff, but 27 spline on wheel side. The CLK BS 27 spline hub fits stock 124 wheel bearing. But are the 27 spline 140 and 27 spline CLK BS the same size? And is the 140 axle the same length as 124 axle? If so, the best combo to me looks like: 210 mm 129 diff case Wavetrac or qualfie 140 axles CLK BS flanges |
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