Dobinsons Coil Spring Rear Suspension Upgrade (C59-819V) Installed on 2024 TRD Off-Road Longbed

[Tacoyaki]

Thanks for the summary elturco!

I just got off the phone with Dobinsons. Once I said "1000 lbs", he immediately went to the 821. I did mention that folks were running the 819s on 850-900 lb loads and still above stock ride height, but the discussion went to what elturco mentioned, that there's likely little to no spring travel remaining at that point.
Interestingly, the 819 is 10mm longer free height than the 821.

I prefer not to raise the front, at least not at this time. Seems with the 819s, I'll be ~23.5"-ish in the rear, but having little to no spring compression left is a concern. While I'd rather not have it much higher than stock, the 821s will theoretically be ~24"-ish, so ~1" higher than stock, which we can live with (we're short, so getting up and down is challenging with more height, but I do have CaliRaised sliders I need to install, which should help with entry/exit...not planning to rock crawl, but also want to be prepared in case I hit a trail with unexpected rough path).

Also, considering with the new springs, I shouldn't hit my bumpstops anymore, is there any advantage to getting the Timbren bumpstops?

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[elturco]

That sounds about right but I think that you will still have to add at least 1 inch of lift in the front. Peak suspension has a top spacer that can do that for you. In theory, your truck should end up about 24.5+ish inches fully loaded... thats what I expect from mine with the 819s at full load (660 lbs) but my constant height is 25.25 since I only carry 330ish lbs. Hence my decision go 2 inches is to deal with the existing rake while not fully loaded.

 

[elturco]

Interestingly, the 819 is 10mm longer free height than the 821.

Since you noticed, because I noticed that the 819 were longer than the 821s and I said ... "wait, is this right?" and I had to double check but it is right. The 819 are longer but the tube that the 821s are made from is thicker. I imagine that this is what helps carry the weight while retaining a similar height/weight ratio across their different SKUs.

 

[Tacoyaki]

Measurement Update!

Just installed the 821 springs, so new measurements are (keep in mind, this is with virtually no driving on them, so not sure if they'll settle just a tiny bit):

Front: 20.5 in (was 20.25 in, so the rear actually raised the front slightly)
Rear: 24.5 in

I'll be taking a trip in a couple of weeks, so will report back how the 821s ride and feel. I'll have ~120 lbs of additional water, and maybe another 70-100 lbs of stuff, so we'll see how it is with that additional weight.

 

[elturco]

Measurement Update!

Front: 20.5 in (was 20.25 in, so the rear actually raised the front slightly)
Rear: 24.5 in

Yes.... LOL... my guesstimate pulled out of the air was near it "In theory, your truck should end up about 24.5+ish inches fully loaded.."

Thank you so much for the update. With 1000 lbs on the 821s you are sitting lower than me with 330ish lbs on the 819s. About 1 inch. Interesting that the 821s helped the front come up, I would had never thought of it but it makes sense.

 

[Tacoyaki]

Yes.... LOL... my guesstimate pulled out of the air was near it "In theory, your truck should end up about 24.5+ish inches fully loaded.."

You da man Cesar!

I might be slightly below 24.5" after I load a bit more stuff. I'll definitely report back after my trip. Nothing harsh (just a campground), but will get some miles with a lot of weight on it.

 

[taco_overlander]

@Tacoyaki -- how are you liking the 821s? @andrewleader went with the 819s and seems pleased. you are both running heavy with the M1 and I will too. so curious where everyone is landing.

 

[Tacoyaki]

@Tacoyaki -- how are you liking the 821s?

I have a trip next week, so I'll report back how the 821s do. My wife is worried it'll ride too stiff. I will say at the current 24.5" height, it's harder us vertically challenged folks to get into the bed. We used to use the tailgate as a seat or table while camping, but now it's almost chest height. The step I installed under the rear bumper corner helps us get up onto it. I'm thinking to get a front lift (probably a spacer) to help even it out a little, but I'll wait to see how the current setup is.

Will let you know in a couple of weeks how it feels and performs.

 

[elturco]

If you look at @andrewleader 's chart you can see that the 819's with about 1000 lbs (850 and over) you have about 24.25 of height and on the 821's with about the same weight you have 24.5 height. Thats about .25 difference in height but the big BUT is that a the 819's would be almost fully compressed as you would be over the rated max load of 660 lbs. While the 821's will still have spring in them as their max load is 1210. With my weight of 330-350 or so the 821's felt good, my gf and I did not noticed that the truck was stiffer (it may have been but not noticeable). I mean, why would NOT you get the springs that are rated for your weight if the bed lift is comparable between the 819 and 821?? Is the .25 inch difference enough of a reason to stress your trucks body?

@Tacoyaki I like my peak spacer. I got the 2 inch lift.. not the 2.5... I still have a rake on the truck and I am OK with it as I know that my bed goes down about an inch when I load it up. I went to their location and they installed it pretty quick.

 

[gofastdan]

If you look at @andrewleader 's chart you can see that the 819's with about 1000 lbs (850 and over) you have about 24.25 of height and on the 821's with about the same weight you have 24.5 height. Thats about .25 difference in height but the big BUT is that a the 819's would be almost fully compressed as you would be over the rated max load of 660 lbs. While the 821's will still have spring in them as their max load is 1210. With my weight of 330-350 or so the 821's felt good, my gf and I did not noticed that the truck was stiffer (it may have been but not noticeable). I mean, why would NOT you get the springs that are rated for your weight if the bed lift is comparable between the 819 and 821?? Is the .25 inch difference enough of a reason to stress your trucks body?

@Tacoyaki I like my peak spacer. I got the 2 inch lift.. not the 2.5... I still have a rake on the truck and I am OK with it as I know that my bed goes down about an inch when I load it up. I went to their location and they installed it pretty quick.

I agree with your line of reasoning. I was the guinea pig for this little spring experiment but knowing what I know now I would have went with the 821's. That said, I'm happy with the 819's and doubt I'll trade them out at this point. I may be hitting the stops every once in a while but with the Timbren bump stops I really haven't noticed it.

 

[Tacoyaki]

Do the Timbren bump stops act like secondary springs so instead of hitting a hard bumpstop, you have some additional "spring" reserve?

 

[gofastdan]

Do the Timbren bump stops act like secondary springs so instead of hitting a hard bumpstop, you have some additional "spring" reserve?

Yes, but I wouldn't think of them so much as a secondary spring as I would a soft landing although Timbren does refer to them as "spring helpers"in some of their marketing. They're hollow and will squish before bottoming out. Timbren's website does a good job explaining how they work.

 

[andrewleader]

@Tacoyaki -- how are you liking the 821s? @andrewleader went with the 819s and seems pleased. you are both running heavy with the M1 and I will too. so curious where everyone is landing.

I'm still really pleased with the 819's. I added Tacoyaki's info to my comparison table, I also updated that my weight was actually 900-930 lbs (finally got to a CAT scale after doing my interior build, previously I was estimating 850 lbs but I underestimated my interior).

The 819's have felt really smooth over speedbumps, feels identical to the stock suspension. Based on Tacoyaki's info and my comparison table, it looks like the 821's would be probably 0.5" higher than the 819's for my 900 lb load, so I don't think I'd want to go that high.

It's interesting about the compression limits of the springs though. Seems like ideally someone needs to make a stiffer spring that doesn't lift as much and we'd all be happy! I like a nice 1" lift (which 819 gives) but I don't think I need more than that!

 

[elturco]

I agree with your line of reasoning. I was the guinea pig for this little spring experiment but knowing what I know now I would have went with the 821's. That said, I'm happy with the 819's and doubt I'll trade them out at this point. I may be hitting the stops every once in a while but with the Timbren bump stops I really haven't noticed it.

You and I brother... I had the 821s on my truck and they were too much for the weight I carry. I dont plan to go beyond 660. Had to take them off because my tail was way too high up there... and no way to bring it down.

 

[taco_overlander]

I'm still really pleased with the 819's. I added Tacoyaki's info to my comparison table, I also updated that my weight was actually 900-930 lbs (finally got to a CAT scale after doing my interior build, previously I was estimating 850 lbs but I underestimated my interior).

The 819's have felt really smooth over speedbumps, feels identical to the stock suspension. Based on Tacoyaki's info and my comparison table, it looks like the 821's would be probably 0.5" higher than the 819's for my 900 lb load, so I don't think I'd want to go that high.

It's interesting about the compression limits of the springs though. Seems like ideally someone needs to make a stiffer spring that doesn't lift as much and we'd all be happy! I like a nice 1" lift (which 819 gives) but I don't think I need more than that!

thanks for this. with your load of 900 lbs, how much travel do you have available on the rear with the 819s?

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