Driver's Front Bumpstop (D35 TTB 4x4)

[alwaysFlOoReD]

That is the style I remember as being the longest. I thought about chopping it down, especially the side metal piece but found another shorter one.

 

[alwaysFlOoReD]

86 2.9l 2wd

93 2.3 2wd

93 4.0 4x4

91 4.0 4x4 no motor, unknown source of bumpstop

 

[lowspeedpursuit]

Wish I could pin your post to be the top google result for bumpstops; that's exactly what I wanted to see. Vehicle 3's axle position looks just like mine. I wonder how much dampening those bumps even do, with so little "jounce" before the metal bracket "stop".

I don't see any reason not to ride on my cutoff as-is for now unless a hard hit snaps the bolt or something. Now that we've confirmed the 4x4s are shorter, I'd also be comfortable buying new, but I'm at least gonna wait and see if I need countershaft shims in my trans, rather than killing my wallet on shipping multiple orders.

EDIT: So for future reference, I didn't end up buying a new bumpstop. Now, a month later, they're marked "discontinued", so clearly I missed the boat on that one. Hope the modified 2wd holds up, or I guess I'll have to fabricate something.

 

[96zjlaredo]

Could anyone with the D35 TTB stock in their truck share a picture and a height measurement for the driver's front bumpstop? I feel like the stop in this position is different between 4x2 and 4x4, but I can't find any hard info. Thanks in advance.

I have 1.5' spring spacers on mind due to the springs sagging so I don't know how much this will help you. Sorry for the blurry pic. My phone didn't want to focus on the measuring tape.

 

[lowspeedpursuit]

Nice, thank you. Always good to have more pics & measurements.

If anyone ever comes up with a source for TTB bumpstops other than the junkyard, I'd be interested in that as well.

 

[holyford86]

I didn't see it mentioned but figured I'd ask, did you swap the coil buckets with your conversion? If memory serves me right they are different 4x2 vs 4x4

 

[lowspeedpursuit]

So the buckets were one of the things I looked into after I noticed the bump was contacting. Per various sources, the buckets are meant to be the same. There's also no difference in shock length. I always thought this was kind of dodgy, because mine explicitly have "4x2" stamped into them, but the buckets from my crossmember donor truck are long gone, and I'm not really in the mood to grind & punch the rivets out to rescue the set off the lone 4x4 Ranger at my junkyard.

Even if the buckets were different (or bolted to the frame at a different height?), that shouldn't be functionally different towards ride height than having different spring lengths, right? Like if the 2wd upper coil seat sat 2" higher, that would put my axle closer to the frame, but you should be able to compensate with a 2" spacer.

I can't remember if I posted this before, but during my testing, I established that with the longer 2wd springs on the 4x4 axle, I was already approaching the alignment limits of lengthening my springs. I could jam another 1.5" puck in there, completely hose my camber, and still not get the 2wd driver's bump completely off the diff.

 

[holyford86]

So the buckets were one of the things I looked into after I noticed the bump was contacting. Per various sources, the buckets are meant to be the same. There's also no difference in shock length. I always thought this was kind of dodgy, because mine explicitly have "4x2" stamped into them, but the buckets from my crossmember donor truck are long gone, and I'm not really in the mood to grind & punch the rivets out to rescue the set off the lone 4x4 Ranger at my junkyard.

Even if the buckets were different (or bolted to the frame at a different height?), that shouldn't be functionally different towards ride height than having different spring lengths, right? Like if the 2wd upper coil seat sat 2" higher, that would put my axle closer to the frame, but you should be able to compensate with a 2" spacer.

I can't remember if I posted this before, but during my testing, I established that with the longer 2wd springs on the 4x4 axle, I was already approaching the alignment limits of lengthening my springs. I could jam another 1.5" puck in there, completely hose my camber, and still not get the 2wd driver's bump completely off the diff.

I've got both relatively handy and had just assumed they were different because they're identified as such. I'll throw a measuring tape on both sets and let you know the results. FWIW my 6 inch lift only extended the bumpstops about 4 inches over stock length, which is weird and I've never thought about it until now (the lift has been on the truck for better than a decade).

 

[4x4junkie]

FWIW my 6 inch lift only extended the bumpstops about 4 inches over stock length, which is weird and I've never thought about it until now (the lift has been on the truck for better than a decade).

It's for increased wheel travel/articulation.
No need to lower the bumpstop any more than you have to, it only needs to be lowered enough to keep the shock from fully bottoming out on compression.

Also IIRC, 2WD and 4x4 coil springs are the same (or at least, the same springs come with, say, a 2WD 6" TIB lift and a 4WD 6" TTB lift). The difference in height is in the beam itself.

 

[holyford86]

It's for increased wheel travel/articulation.
No need to lower the bumpstop any more than you have to, it only needs to be lowered enough to keep the shock from fully bottoming out on compression.

Also IIRC, 2WD and 4x4 coil springs are the same (or at least, the same springs come with, say, a 2WD 6" TIB lift and a 4WD 6" TTB lift). The difference in height is in the beam itself.

I don't plan on changing a thing, it works well and just barely doesn't bottom the shocks out.

 

[lowspeedpursuit]

I'll throw a measuring tape on both sets and let you know the results.

Absolutely, please do. I am curious, and we can never have too many measurements for the stuff that's getting older and harder to find.

Also IIRC, 2WD and 4x4 coil springs are the same

So when I was working on this project, I swear I read a thread where somebody talked about putting 2wd coils in a 4x4 truck to net a modest lift. Never been able to find it again.* IIRC the 4.0 has different springs available than the smaller engines, and there are different springs between standard and extended cabs. It's possible that the differences I'm observing don't reflect "2wd vs 4x4", but rather another discrepancy between the donor truck and mine. I also don't know how much any of my used springs may be sagging from age.

What I can say for sure is that I have the coils that came in my 2wd truck, and the coils that came with my junkyard D35 TTB, and my stock coils are considerably longer. They're longer free, laying on the shop floor, and they remain longer installed.

If I ever took exact measurements, I don't know where I put them, but stock unloaded, my truck had rake. Post 4x4 swap with donor springs, truck still had rake. With the D35 on the 2wd springs, the truck now sits level front to rear. I also had to redo my alignment, because installing the 2wd springs increased my camber. Off the top of my head, I would estimate the longer springs are +1.5-2" installed.

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*EDIT: Maybe this? I literally have no idea at this point what my donor axle is originally out of.