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Old 03-12-2013, 12:09 PM   #1
tightline
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Pin Box ?

I need some help with pin box replacement. We have a 325 srx an on some roads it rides real bad in the truck. We added air bags to the truck an this helped a lot have only pulled about seventy miles with air bags . I still think it could be better an have been thinking of changing the pin box. I have read all I have been able to find . I would like to get info from someone that has made a change in the pin box. would you make the same change over or try a different type ? Thanks for any help. Dale
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Old 03-12-2013, 12:43 PM   #2
Festus2
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There are 3 pin boxes that are in common use: Trail Air, Mor Ryde, and 5th Airborne. The Tri Glide Air Ride (by Trail Air) is found on many units while the Mor Ryde and 5th Airborne are a bit less popular.

They all work well to reduce the chucking and the left-right movement in some cases. We have the 5th Airborne and have been pleased with the results. Others like the Trail Air and would recommend it.
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Old 03-12-2013, 12:49 PM   #3
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Dale, I think you will get more help if you supply a little more info. What are you towing with and the year of your trailer. As for air bags... at times they can minimize the effectiveness of shock-absorbers by limiting their travel. Does your trailer have any type of shock dampening on it's axles? We need more info, Hank
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Old 03-12-2013, 12:53 PM   #4
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The nice thing about the TrailAir Tri-Glide is that it combines the best features of several designs. The Air Bag and Shock for up and down movement, and the glide feature (very similar to the Demco) to help with the back and forth (chucking) movement. It's very interesting to watch in the rearview mirror and see the front of the 5er just sort of floating along.
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Old 03-12-2013, 03:36 PM   #5
tightline
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I started to put more info sorry. TV is 2002 Chev 2500 HD 8100 Allison Reese 18000 signature series under bed mount AirLift 5000 2012 Cougar 325 srx Trailair Equa-Flex Suspension Loaded 1760 Lb pin weight this is 1044 lb under graw total trailer weight 11480 that 720 lb under the max for the trailer. Truck weight 7460 total truck an trailer 18940 GM spec. 20000 max or 12500 max on a 5th wheel I am under on the weights not as much as I should maybe . The trailer pulls great just the truck ride is rough. The air bags helped a lot an I think most of problem is up an down movement . I have pulled trailers for years Tag a long an goosenecks first 5th wheel. Maybe I want to much Thanks for the help!
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Old 03-12-2013, 04:12 PM   #6
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I put a Mor-Ryde on my trailer and it helps a lot with fore and aft chucking, which was my only real complaint. It does nothing for up and down porpoising, but I wasn't having a problem there anyway. If porpoising is an issue with you, a moderate amount of air in the bags along with a GOOD set of shocks, such as Bilstiens, will go a long way towards solving it. At 1760 loaded pin weight you shouldn't have a porpoising problem as this is fairly light. Mine is an even 1000 lbs. heavier. I think that a lot of people make the mistake of running too much air in the bags and the truck starts bucking because the shocks aren't being allowed to do their job, as Hank stated above. With your pin weight I would think 25-30 psi (loaded) should be plenty. With my pin of 2750, I run 45-50 psi on my F-350 srw.
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Old 03-13-2013, 05:56 AM   #7
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I second the motion on the Bilsteins. I've had 3 Silverados, and the ride improved greatly just by replacing the oem shocks on all three. I'm sure that would help, along with the other things mentioned already. Since your truck is an '02, maybe you've already replaced the shocks?
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Old 03-13-2013, 01:24 PM   #8
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Quote:
Originally Posted by harpoon View Post
I second the motion on the Bilsteins. I've had 3 Silverados, and the ride improved greatly just by replacing the oem shocks on all three. I'm sure that would help, along with the other things mentioned already. Since your truck is an '02, maybe you've already replaced the shocks?
X3 On the Bilstiens

I put a full set on my Ram 01 2500 with a 2,300# pin and NO Bags, made a big difference!!

Now I need shocks on the 5er.
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Old 03-13-2013, 02:39 PM   #9
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Quote:
Originally Posted by mhs4771 View Post
The nice thing about the TrailAir Tri-Glide is that it combines the best features of several designs. The Air Bag and Shock for up and down movement, and the glide feature (very similar to the Demco) to help with the back and forth (chucking) movement. It's very interesting to watch in the rearview mirror and see the front of the 5er just sort of floating along.
X2

I won't own another 5er without it, best money I've ever spent on an "upgrade".
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Old 03-13-2013, 07:17 PM   #10
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Originally Posted by webslave View Post
X2

I won't own another 5er without it, best money I've ever spent on an "upgrade".
100% agree with this statement.
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Old 03-14-2013, 10:29 AM   #11
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Good thread and my Bilstein 4600 series arrived yesterday. Thanks for validating my decision on those.
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