OBS 05+ axle swap

RBernardi · Sep 13, 2016

Good info here I was wondering about the buckets too.

diesel dane · Sep 16, 2016

We had to do a pmf 3 link instead of the 4 link. My 4wd (as low as possible) 97 looked like it would get stuck on a speed bump with the 4 link bracket. The bottom of the the bracket was SO close to the ground

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sdh1994 · Sep 17, 2016

One other question I had was if using a 05+ steering box what shaft is everyone using? The factory obs to box or something else.

m_j · Sep 18, 2016

diesel dane said:
We had to do a pmf 3 link instead of the 4 link. My 4wd (as low as possible) 97 looked like it would get stuck on a speed bump with the 4 link bracket. The bottom of the the bracket was SO close to the ground

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pics of the low truck plz
I want to build a low one

diesel dane · Sep 18, 2016

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Strokersace · Sep 18, 2016

diesel dane said:
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What wheels are those?

Vader's Fury · Sep 18, 2016

Look like 20" Mickey Thompson classic II.

diesel dane · Sep 19, 2016

Yep

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Strokersace · Sep 19, 2016

Vader's Fury said:
Look like 20" Mickey Thompson classic II.

diesel dane said:
Yep

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Dang! I'd absolutely love to get my hands on a set of those! Wish they still made them.

What's to offset on those? Do they stick out off the body a good bit?

psduser1 · Sep 19, 2016

Strokersace said:
Dang! I'd absolutely love to get my hands on a set of those! Wish they still made them.

What's to offset on those? Do they stick out off the body a good bit?

About an inch and a half on the 99-07 bodies.

diesel dane · Sep 19, 2016

They stick out a tad yes

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zilla68 · Sep 19, 2016

diesel dane said:
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what bedcover is that?

sdh1994 · Sep 19, 2016

Does anyone know if the knuckle vacuum seal needs to be used if using manual hubs? I started trying the 05 axle down and don't see what purpose it does. Can't seem to find an answer.

Strokersace · Sep 22, 2016

diesel dane said:
They stick out a tad yes

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Liked them better shiny.

I meant to ask what backspacing they have? Looks like the 99-04 backspacing.

psduser1 · Sep 22, 2016

sdh1994 said:
Does anyone know if the knuckle vacuum seal needs to be used if using manual hubs? I started trying the 05 axle down and don't see what purpose it does. Can't seem to find an answer.

It'll keep dirt out, other than that, no reason for them with manual hubs.

Strokersace said:
Liked them better shiny.

I meant to ask what backspacing they have? Looks like the 99-04 backspacing.

If I remember correctly, about 5" of backspace. Got a set on my ex, currently.

psduser1 · Sep 22, 2016

As the truck is today (02 axles)
Damm sideways pic.

Strokersace · Sep 22, 2016

Yeah those same wheels on the 05+ axles will be out another inch to 1.5"s.

Vogel469 · Sep 22, 2016

What are your guys doing for trac bar mount with the 05+ axle?

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markfuga · Sep 23, 2016

You'll need to make your own track bar mount. I high recommend designing the mount exactly like the mount in the 05+ trucks: attaching to the frame AND engine cross member. This is the part of the swap where I've seen a lot of scary implementations. Here's my thoughts: Build a bracket out of heavy steel (I used 3/8 and 5/16 plate), Attach with larger bolts (I used the 05 donor bolts at the frame and three 1/2" bolts at the engine cross member), DO NOT WELD TO THE FRAME!

If your not a welder and/or don't have access to heavier steels then I believe there are some after market options out there to buy a bracket. I made a jig when I built mine so I can re-produce it at any time.

Take this part of the swap seriously. Think about how much stress that bracket is under when cornering hard. Then add braking into a hard corner and the stress levels multiply many times over.

This concludes our safety briefing.

webb06 · Sep 23, 2016

markfuga said:
You'll need to make your own track bar mount. I high recommend designing the mount exactly like the mount in the 05+ trucks: attaching to the frame AND engine cross member. This is the part of the swap where I've seen a lot of scary implementations. Here's my thoughts: Build a bracket out of heavy steel (I used 3/8 and 5/16 plate), Attach with larger bolts (I used the 05 donor bolts at the frame and three 1/2" bolts at the engine cross member), DO NOT WELD TO THE FRAME!

If your not a welder and/or don't have access to heavier steels then I believe there are some after market options out there to buy a bracket. I made a jig when I built mine so I can re-produce it at any time.

Take this part of the swap seriously. Think about how much stress that bracket is under when cornering hard. Then add braking into a hard corner and the stress levels multiply many times over.

This concludes our safety briefing.

Interested in making another to sell? Doing this swap on a friends truck and he's yet to nail down a track bar mount.

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