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Heavier Duty Shock Absorbers?

 
  #1  
Old 03-08-2019, 06:50 PM
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Heavier Duty Shock Absorbers?

On my '03 EB EX I upgraded the leafs front and rear last year to V/C codes from ATS. At the same time I installed a set of Bilstien HD shocks (185479 rear, 185462 front) from SD Truck Springs. Rode beautifully. Still does, for the most part. But lately the suspension is "bouncing" over potholes and I'm getting that front-end dive under braking and bouncing over speedbumps again. After only 10k miles I'd be shocked if the Bilstien's are shot. If they are, is there a "better" heavier duty product/brand out there, short of adjustable shocks or ones with remote reservoirs, etc? Yes, I looked through the tech folder.
 
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Old 03-08-2019, 09:11 PM
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If you measure from the center of the hub to the bottom of the fender arch both from and rear and post up those measurments I can confirm my hunch.

my best guess is the reason the Bilstein 4600 only lasted 10k miles on your Ex is those are only made for stock height vehicles and with the increased ride height of your spring combo you need longer shocks, your shocks topped out which damages the seal and let the pressurized nitrogen gas inside of them escape, when that happens the oil airates and now your shock is no longer functions correctly.

Bilstein builds a decent quality product but no shock is designed to be either a bump stop or a limiting device and installing to long or to short shocks ruins them in a hurry.

post up those measurments and Ill get you the part number for the correct length Bilstein shock.
 
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Old 03-08-2019, 09:32 PM
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I’m pretty sure my Bilsteins are shot too. 27” front, 29” rear
 
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Old 03-08-2019, 09:38 PM
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Originally Posted by SmackDaddy View Post
Im pretty sure my Bilsteins are shot too. 27 front, 29 rear
what are your shock dimensions ?
@27/29 you need a 10/12 shock. ( extended shaft length )
 
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Old 03-08-2019, 11:17 PM
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The raised height of the V/C had me thinking about longer shocks (for lifted EX's) but went with the ones I have. The measurements close enough for this conversation are 25.5in front, 26.5 rear.
 
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Old 03-09-2019, 12:01 AM
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i would go with 10s and 12s, stock ride height was 23 front and 24 rear with 8 and 10” shocks ( fully extended shock shaft “

the Bilstein with the closest ( educated guess since Bilstein doesn’t five out the valving specs for the 4600 ) valving is the 5165 series, The 5100 has digressive valving whereas the 5165 has progressive valving.

Front Bilstein 5165 linear valving 255/70
Part number 25-177510
23.6 extended
14.2 collapsed
9.8 shaft length


Rear Bilstein 5165 linear valve 255/70
Part number 25-175783
28.5
16.9
11.6

They make the 5165 is a lighter 170/60 and a heavier 360/80
the first number is rebound with the second being compression in newton meters of fource.
The 170/60 may be closer to the 4600 but in my opinion to soft. If that is what you want then I”ll get you those part numbers
 
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Old 03-09-2019, 12:37 AM
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Thanks for the recommendations based on ride height and my wanting a stiffer "truck" ride rather than a boulevard cruiser. The 25-177510 5165's that I see on-line are all remote-reservoir set-ups - yes? Is there a PN for the rears? Remote reservoirs too? Also sales material I see says the 5165's are "digressive" vs "progressive". In the end, I'd like a shock that has a higher/heavier compression/rebound value.
 
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Old 03-09-2019, 09:58 AM
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I added the part number for the rear 5165 in my above post.

I suggested the the 5165 because you asked for “heavy duty” a shock with a remote resevoir seperates the oil and nitrogen allowing you to run a shock harder for longer period of time, other then that there really is no criteria for “heavy duty” I didn’t see where you asked for a stiffer truck ride, but if that is the case get the 360/80 valving.

Bilsteins sales catalog is a little confusing but if you read it close it says the 5125 is built off the 5100 technology and the 5165 is built off the 5160 technology, So then you need to go read up on the 5100 and it is digresive, then go read up on the 5160 and it says “ Self-adjusting deflective disc valving” which is just a fancy way to say linear valving.

if you want the digressive valved 5100 the part numbers are ( personally I prefer linear but who cares what I like...lol )
.......Bilstein 4” lift ....... factory valving.
Front 33-185545 Bilstein 5100 (5125)
Rear 33-236964 Bilstein 5100 (5125)


.......Bilstein 5125......255/70 valving

Front 33-185552
10.17 travel

Rear 33-185569
11.94 travel




 
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Old 03-11-2019, 12:01 PM
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Thanks so much. I hadn't thought remote reservoir shocks were something to consider, but the more I read, the better they look. I've looked on-line at Bilstein's web catalog and they don't show a different PN for the 5165's with the 360/80 valving vs the 255/70 that you've posted above. Before I call around, do you have the PN's for the 360/80's?

Update - I think I found the # for the front 360-80's - 25-177303 - same specs length/travel. The rear # for the 360/80 valving might be 25-187724, but the travel is 11.3, comp is 16.1, ext is 27.4.
 
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Old 03-11-2019, 12:57 PM
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11.3 might work, might not.
Best bet is to put it on a lift and measure at full droop,
 
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Old 03-11-2019, 01:34 PM
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droop measurement was going to be the next step. In your opinion, since these are such a step up from the 4600's, would there be any concern putting the 360/80 shocks on the front and the "softer" 255/70's on the rear?
 
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Old 03-11-2019, 02:46 PM
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I have never run the 360/80 only the the 255/70 and they were good for highway use but needed more compression for much more then slow-ish dirt road driving.
Then the dirt road got rough they were lacking.

my current shocks are custom valved and have a good bit more rebound and compression then the 255/70 I had but I can’t say how much because I simply didn’t keep track in a manner that would allow a comparison, Also, I run a 37’s tire..... for a lighter tire the 255/70 may have very well be ideal... hard to say for certain.
 
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Old 03-11-2019, 03:49 PM
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if you have a commercial truck scale near you go get weighed. also post up your front and rear spring rates.... the weight bias and spring rate difference would be a similar diffrence in shock valving.

380/80 front 270/70 rear sounds reasonable without looking at some data.
 
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Old 03-13-2019, 07:12 PM
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Thanks for all the helpful discussion. With the ATS springs, stock 16in rims and stock-size Wrangler Duratrac's, I opted to only take one step up to the longer 5125's (33-185545 and 33-236964) for now. Installed them today, for sure rides better.
 
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Old 03-13-2019, 07:16 PM
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Glad it worked out for you.
 

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