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Old 03-17-2019, 11:45 AM   #1
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New Shocks--Yahoo!!!!

There has been quite a bit of discussion recently about new shocks on the forum. I replaced the rear shocks on my 2003 40ft MDTS [178k miles] this weekend [under Koni warranty] and wanted to share my initial observations. I replaced the rear shocks with Koni 88-series--old shocks were also Koni 88s, installed 2014, so maybe 50k miles on them. One of the old shocks had moderately weak dampering in one direction, the other was very weak in both directions.

So with nearly 3-year old Koni 99 series in front, new Koni 88s in the rear, and motion control valves [33k lbs model] on rear axle, I took my rig for a drive this AM. Results were pretty positive. The rear axle was well behaved--significant "Walmart-wobble" improvement. I remain satisfied with overall 99's performance on the front axle. Time will tell--but initial results are very good.
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Old 03-17-2019, 12:46 PM   #2
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Good to read you are satisfied with the new rears. Motion Control Valves are next on my list.
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Old 03-24-2019, 11:00 AM   #3
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Dale....I'm not familiar with "motion control valves" How do they work, and where do you get them? I put 99's on my coach about a year ago, front and back. No prob so far.
I' also wondering about the new motion control systems that HWH is advertising. Am wondering if they are adaptable to our airbag systems?
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Old 03-24-2019, 02:25 PM   #4
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Brazels sells MCUís. We have them on ours, they were installed by the PO, so I canít offer feedback on before/after results.

We took the coach to Hendersonís for their Road Performance Assesment 2 years ago. Their only recommendation was to switch to their MCUís, which they said have a 2-way valve vs a 1-way valve. I plan to ask is they will allow me to demo a set before the Crater Lake rally.
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Old 03-24-2019, 02:47 PM   #5
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How tough is changing the shocks? Is this able to be accomplished in the driveway?
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Old 03-24-2019, 08:17 PM   #6
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Quote:
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How tough is changing the shocks? Is this able to be accomplished in the driveway?
Yes, it can be a DYI ... some larger shop tools will be required.
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Old 03-24-2019, 08:53 PM   #7
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Yes, it can be a DYI ... some larger shop tools will be required.


AKOne, what larger shop tools? I love to learn to do things myself, but if the cost of the tools that I donít have dwarf the cost of a shop doing the maintenance, then Iíll let them do it.

Iím having tires replaced in June, so their techs will already be under the coach...
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Old 03-24-2019, 08:53 PM   #8
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Anyone know the part numbers for 99ís for the front and the 88ís for the rear on a 2005 40 FDTS?
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Old 03-25-2019, 08:15 AM   #9
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….this info is all on the IRV2 forum...in many places and in many ways....see Koni website--they have the part numbers for 99s and 88s on our Peak chassis and these are the only replacement options for Koni....88 number is 88-1022s and 99s are listed too.
PS--front shocks are pretty accessible but rear shocks are a bit of a challenge to reach....if you don't take the wheels off, you will almost certainly need an impact wrench [air or electric; 500+ft/lbs]. I am likely the one who replaced those current front shocks for the PO--so bolts are probably not "overly" tight.....
PSS--unless you know for sure that its been done, its also about time for a brake fluid flush, which does require wheels off.
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Old 03-25-2019, 08:51 AM   #10
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Anyone know the part numbers for 99’s for the front and the 88’s for the rear on a 2005 40 FDTS?
Tommy,

I did mine in Nov of '16. I changed them myself in my driveway. I was 2 years younger then, time takes it's toll. The fronts are like a giant car, very accessible and straightforward. The new Konis are a lot heftier than the existing shocks and quite a bit harder to extend and collapse for reaching the mounting studs, but easy to do.

The rears are a little tougher, when I first looked at them I thought I'd have it done. Once I got under there and looked again it seemed doable.

I drove up on blocks for both ends to provide a little more working room and used an electric impact with an extension for the rears. If memory serves I would say an hour for the front and 2 hours for the rears, not rushing. Take a good hard look and give it some thought.

That said, if you're going to the tire shop anyway, it would save you some work and it would be simpler with the rear wheels off and probably fairly fast for them to change them.

I ordered Koni 8805-1022 for the rear and Koni EVO 99B-3209 for the front. I bought from Ultra RV Products at that time they were about $725 delivered.

If I was having tires done at the time I would've had the shop do it just because they're already there.

FWIW, I'm happy with them.

Terry
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Old 03-25-2019, 02:28 PM   #11
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Thanks for the reply Terry! Iím going to ask them what theyíll charge to change them for me.
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Old 03-25-2019, 02:30 PM   #12
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Quote:
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Ö.this info is all on the IRV2 forum...in many places and in many ways....see Koni website--they have the part numbers for 99s and 88s on our Peak chassis and these are the only replacement options for Koni....88 number is 88-1022s and 99s are listed too.
PS--front shocks are pretty accessible but rear shocks are a bit of a challenge to reach....if you don't take the wheels off, you will almost certainly need an impact wrench [air or electric; 500+ft/lbs]. I am likely the one who replaced those current front shocks for the PO--so bolts are probably not "overly" tight.....
PSS--unless you know for sure that its been done, its also about time for a brake fluid flush, which does require wheels off.


Dean, thanks for the heads up. How often does the brake fluid need to be flushed? Iíve never had issues with brake fluid in any of my cars, but I know these are a different beast. Iím guessing that is best accomplished by a shop?

Thanks in advance.
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Old 03-25-2019, 02:39 PM   #13
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Opinions vary but I recommend every 2-3 years--no more than 4. To do this properly on the 4-piston, caliper brakes, like yours; the wheels should be removed to gain access to the outside calipers bleed screws....removing wheels is not a job for the faint of heart....
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Old 03-25-2019, 02:51 PM   #14
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Iím going to try to get through a year with it as is; already done way more than we planned this year. I still have great stopping power. Will put this on the list for next year.

Any idea of the cost?
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