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Old 04-06-2009, 04:42 PM   #1
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Suburban 2500 replacement shocks

I tow our 2005 classic 25 footer with a 2009 Suburban 2500.

I just did a weekend drive in norther Arizona and came up with two issues that I would like some feed back on. We were not towing during this trip.

1) On the down hill grades, when i applied brakes I noticed a oscilaton
coming from the front wheels or wheel. No feed back in the stearing wheel.
Seemed like a low level rotational thumping, not heavy but there.

2) Also, I am tired of feeling every bump and road crack being trasmitted through the stock shock absorbers. Can any one suggest a shock that will smooth out the ride.

When we haul our Airstream it weighs in just over 8400 and we hual just over 6000 miles a year.

Thanks

Allan
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Old 04-06-2009, 05:45 PM   #2
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There is only one chose when it comes to shocks. Bilstein. I have had a set on my 2500 4x4 for over 80,000 miles and installed a set on my Excursion as soon as I bought it. Now 20,000 miles later.

The first thought on the front end would be a rotor warped from heat but if that you should feel something in the steering wheel.
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Old 04-06-2009, 09:56 PM   #3
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Quote:
Originally Posted by allanrd View Post
1) On the down hill grades, when i applied brakes I noticed a oscilaton
coming from the front wheels or wheel. No feed back in the stearing wheel.
Seemed like a low level rotational thumping, not heavy but there.
It's a 2009: why are you not taking it straight to the dealer to get it checked out?
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Old 04-07-2009, 08:53 AM   #4
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Quote:
Originally Posted by allanrd View Post
I tow our 2005 classic 25 footer with a 2009 Suburban 2500.
2) Also, I am tired of feeling every bump and road crack being trasmitted through the stock shock absorbers. Can any one suggest a shock that will smooth out the ride.

Thanks

Allan


Allan,

I would suspect the tires before the shocks. Past experience convinced me to replace OEM with Michlein LTX 265/75/R-16 Load E. Excellent smooth riding tire. ECM re-calibrated for increased tire height.


Autoride uses an electronic control module (ECM) to continuously monitor brake, throttle and steering inputs as well as vehicle body and wheel motions. Using this data, the ECM can maintain ride quality by separately and electronically adjusting the hydraulic fluid flow through the valving discs in the shock absorbers.

With a 2009 I would have the system checked, there could be a problem in the control system.

Our 06 Burb has the same system and it is the best riding TV I've used.

If you are considering shock replacement make sure they are compatible with the system or you will lose the auto-valving feature.

Stream Safe

BC
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Old 04-07-2009, 10:00 AM   #5
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On a TV that new, I would suspect other causes than the shocks. Tires would be my first suspect.

As far as the hard ride goes, try tire pressure reduction when not on tow duty. We tow with two different 2500 Suburbans, an '04 and an '05. The Suburban on tow duty run 80 psi rear and 70 psi front. The off duty Suburban run 70 psi rear and 50 psi front. The off duty Suburban has a nicer ride.

We run Michelin X E's on both Suburbans. The '04 has 265 75's and the `'05 has 245 75's. The '05 will be getting 265's when the tires are next replaced.

Brian
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Old 04-07-2009, 11:22 AM   #6
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I agree the tires will greatly effect the ride but the above mentioned tire pressures a grossly overinflated.

Check the inflation chart against your axle weights and set the tires accordingly. This is a Goodyear chart but can be used for others as the Government requires the same performance standards tire for tire in the same class

http://www.goodyear.com/truck/pdf/da...dInflation.pdf

I run 45 lbs in my trailer even thought the chart calls for 35 lbs. I do this to be able to run on 5 if I have to. In my Excursion I run 55 front and rear, the diesel is heavy on the front end.

All to many people fall into the trap printed on the sidewall of the tire. That is the MAX tire pressure per some lawyer and relates to nothing when it come to driving
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Old 04-09-2009, 11:03 AM   #7
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Originally Posted by HowieE View Post
I agree the tires will greatly effect the ride but the above mentioned tire pressures a grossly overinflated.
Ours carry 75/70psi without and 80/85psi when towing,TV 3720# frt & 4740# rear, 7480#trlr. Have had very good tire life with two TV over 190k.
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Old 04-09-2009, 12:33 PM   #8
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Ours carry 75/70psi without and 80/85psi when towing,TV 3720# frt & 4740# rear, 7480#trlr. Have had very good tire life with two TV over 190k.
Bob I am not going to ask you to take my word on this but I would strongly suggest you call Michelin 1-866-866-6605 and ask them for the tire pressure. I am running the same Michelin 265 75 R16 on my Excursion at 55 lbs. I think we would all like to hear the results.

Michelin no longer puts the inflation chart on the web but will give you the proper pressure if you call them. However since the Feds require all manufactures to meet the same standards tire for tire you can use this chart to get an idea.

http://www.goodyear.com/truck/pdf/da...dInflation.pdf
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Old 04-09-2009, 01:21 PM   #9
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The front end may need an alignment, the brake pads may not be wearing properly, or the tires may need balancing. None of these things should happen with a new truck, but they can.

Thanks, Howie, for the tip about calling Michelin since I'll be putting Michelin's on our Tundra soon. It appears you can ask tire pressure questions on their e-mail option. They now have LTX A/S and LTX A/T2, the latter more an off road tire and with a better treadwear rating. I can't figure out load range from the website and it seems they now use "load index" which I have yet to figure out.

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Old 04-09-2009, 02:40 PM   #10
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Last time I checked, detailed tire data is available on www.tirerack.com. They also have tire reviews by readers. Having posted comments there and seen my own posts, I assume that most posts are as true as most comments on Internet sites (meaning you still have to take them with a grain of salt). However, my personal comments were unedited.

We are also looking for tires for our 2008 Tundra, and have been considering the Michelin LTX A/T2. If you get these, let us know how they work out.

Thanks...
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Old 04-09-2009, 03:19 PM   #11
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I've been doing price checks on the LTX A/T2 which is what was formerly ATX I think. So far Discount Tires has the best prices with Sears 2nd. The Big O website doesn't work, but the local store tells me they'll match the best price. There's a Load Range C and E A/T2, but mostly dealers only sell the E Range. The difference in price isn't that much, so why not get the E? The other tire Michelin has is the LTX A/S (seems like that used to be just plain LTX)—treadwear rating on that is 420 vs. 500 on the A/T2. The A/S is much cheaper, but only available in Load Range C (load index 114). E seems to be load index 123. It's very hard to get clear info about load ranges on the internet for the A/T2, including on Michelin's website. The A/T2 has a more aggressive tread and is more an off road tire than the A/S. Seems to me the A/T2 E Load Range is going to last a lot longer, be more bulletproof, and ride a little less comfy. We've had both LTX and ATX tires in the past and I didn't think there was a lot of difference between them as far as a smooth ride.

We are on a massive highjack about Michelin tires.

So Allan, what's happening with your Suburban?

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Old 04-10-2009, 12:27 AM   #12
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Suburban 2500

Thanks for the great responses.

My tires are inflated to the Max pressure. Never realized the recommended pressure was not the optimum pressure for ride comfort.

I am going to take the truck into the dealer tomorrow to check on the
vibration on high speed breaking.

I have been thinking about replacing the stock tires with a larger set.
I have just over 20,000 on the vehicle and the tread is still deep.

Also added a K&N cold air intake prior to hauling across the US last summer.

Thanks every one for the support.

Allan
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Old 04-10-2009, 08:30 AM   #13
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Also added a K&N cold air intake prior to hauling across the US last summer.
Allan
Sorry to jump on your parade but a word of caution about the K&N filter. They will pass sand. If you live in an area without small particles in the air the K&N is OK. I live in NJ and had run a K&N for years. I had been traveling in the south west and then up into Canada. I removed my K&N to check it and found a quantity of sand in the intake just after the filter. My installation was a Banks system and the filter was after the turbo so there was a coating of oil on the walls of the intake and that trapped the sand. A filter before the turbo would never have presented the evidence just passed the sand directly to the engine.
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Old 04-10-2009, 09:11 AM   #14
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I don't know anything about a Banks system, but it sounds like it has a turbo in it. I would think any filter would pass a lot with a turbo before it. Shouldn't such a system have a filter before it?

I've used K&N filters for a couple of years and have had no problems. No turbos of any type.

We decided to get Michelin LTX A/T2 LR E tires now rather than after a 5-6000 mile trip. We'd be worrying about the OEM tires and whether they'd last through the trip. The Michelins are much better tires and we'll feel better, though poorer too. Unfortunately the 4Runner will need tires this summer too.

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