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AU Suspension K-Frame 

 

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 Post subject: AU Suspension K-Frame
Posted: Sat Jun 04, 2011 2:17 pm 
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So everyone is drilling through the chassis rails on the E-Series to mount the AU Crossmembers as there's a number of advantages to the AU gear including the better brakes, late model offset, late model engines bolt in etc etc.

However, I've been wondering if it would be possible to legally modify an EA/EB/ED K-Frame to mount the lower control arms and rack from an AU so you don't have to f**k around with drilling through the chassis, moving the existing crush tubes etc.

Any engineers in the house? :D

 

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 Post subject: Re: AU Suspension K-Frame
Posted: Sat Jun 04, 2011 6:22 pm 
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Have you even looked at an AU lower control arm?

They are a completely different design and setup compared to a boxcar. If it was that simple it would have been done already, and we would have all done the conversion.

There was a member who tried to have custom lower control arms made, and he even had some prototype built, but gave up due to a large issue with bump steer. The e series steering rack ends were on too much of an angle and a fix was not found.

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 Post subject: Re: AU Suspension K-Frame
Posted: Sat Jun 04, 2011 6:25 pm 
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As mentioned, Rollin had some custom arms made, ED one end, AU the other.
due to the difference in where the steering rack bolts up it gave an awkward angle to the tie rods.

 

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 Post subject: Re: AU Suspension K-Frame
Posted: Sat Jun 04, 2011 6:43 pm 
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Yes I have looked at the lower arms.

The point I was trying to make is that the K-frame is made of steel, cutting and rewelding plus reinforcing it to mount a lower control arm from an AUII-BF as well as moving the rack position to suit using the BA rack. I'm just wondering about the legalities of doing it, people cut the front off the k-frames and weld in tube all the time to fit the AU/BA motors.

 

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 Post subject: Re: AU Suspension K-Frame
Posted: Sat Jun 04, 2011 6:55 pm 
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the amount of work involved in cutting/modifing the e series k frame to take the au lower arms and changes in rack position..
it would be just as much work to fit the au k frame and it would look much neater...
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 Post subject: Re: AU Suspension K-Frame
Posted: Sat Jun 04, 2011 7:56 pm 
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knowsfords wrote:
Yes I have looked at the lower arms.

The point I was trying to make is that the K-frame is made of steel, cutting and rewelding plus reinforcing it to mount a lower control arm from an AUII-BF as well as moving the rack position to suit using the BA rack. I'm just wondering about the legalities of doing it, people cut the front off the k-frames and weld in tube all the time to fit the AU/BA motors.


They do that all the time, but the 1" RHS section thats moved or relocated is far less structural then mounting points for pivoting parts.
and a lot of the time the modifications are pretty difficult to spot given its so simple.

if you're asking about legalities, you'd have to ask an engineer.

redrilling the rails and putting new crush tubes in isnt the most complicated of tasks.
but i'd even question the legalities of drilling/welding rails as it is.

 

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 Post subject: Re: AU Suspension K-Frame
Posted: Sat Jun 04, 2011 7:57 pm 
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I'm not sure if it would be harder, the way others have done it is to drill the chassis rails which as far as I can tell takes the best part of a day, then you have to weld up spacer plates anyway.

Plus you have to move some of the existing crush tubes which requires you to cut the chassis rail and re-weld which I'm pretty sure is illegal unless you've got specialized equipment to ensure no heat fractures occur.. Which is why BBQBurner rolled with his initial mistakenly drilled hole as it ended up meaning the new holes missed the old crush tubes and meant the front crossmember could be modified to use the original front studs in the rails.

The advantage (in theory) of doing it this way is you can mod a k-frame out of the car and then swap it out cutting down the conversion time considerably.

 

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 Post subject: Re: AU Suspension K-Frame
Posted: Sat Jun 04, 2011 8:15 pm 
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knowsfords wrote:
I'm not sure if it would be harder, the way others have done it is to drill the chassis rails which as far as I can tell takes the best part of a day, then you have to weld up spacer plates anyway.

Plus you have to move some of the existing crush tubes which requires you to cut the chassis rail and re-weld which I'm pretty sure is illegal unless you've got specialized equipment to ensure no heat fractures occur.. Which is why BBQBurner rolled with his initial mistakenly drilled hole as it ended up meaning the new holes missed the old crush tubes and meant the front crossmember could be modified to use the original front studs in the rails.

The advantage (in theory) of doing it this way is you can mod a k-frame out of the car and then swap it out cutting down the conversion time considerably.


BBQ Burner still ended up going through one of the old horrizontal crush tubes.
Not quite sure how you'd manage the front pivot anyway?
Given you're going from a lower control arm + radius rod to a single piece lower control arm.
there would need to be some significant alterantions to the front of the kframe.

 

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