Atlas Truck Swap question

[kc9jts]

I am looking at modeling a few Soo Line GP30s that rode on trucks traded in from Alco FAs.  (Example: http://www.rrpicturearchives.net/showPicture.aspx?id=97507 )
To accomplish this I swapped the Blomberg B trucks from the GP30s I intend to paint with some AAR trucks from some U25Bs I had laying around.  The GP30s ran fine with the donated trucks whereas the U25Bs were slow as could be.  I am wondering if there is a better way to do this or a place to order the truck assemblies.  I tried ordering the AAR (U25B-ish) sideframes already and putting those on the Blomberg B assemblies from the GP30 but they did not fit well and make a horrible grinding noise if I run it.  I am wondering if I am going about this the wrong way or if someone else has ever done this before.

THanks in advance,

NBT
Omaha

[Catt]

Not sure what the problem is but I do have a question for you.Are the two locos either ATLAS-KATO or ATLAS- China.If they are one of each then you may have your answer as the trucks may not trade out successfully.

[kc9jts]

They are all Atlas-China straight up and unfiltered (not Kato).

Thanks,

NBT

[kalbert]

I can't answer to the question.... But I can say Cool! I know where #711 is. I have driven it!!!

http://www.rrpicturearchives.net/showPicture.aspx?id=3110138

EDIT: If I'm understanding correctly, you tried the U25B trucks on the GP30 mechanism and it worked ok? You can get complete truck assemblies right from the Atlas parts department.

https://secure.atlasrr.com/mod1/itemdesc.asp?ic=9445300

[u18b]

Would these be for a GM&O?

[kc9jts]

I can't answer to the question.... But I can say Cool! I know where #711 is. I have driven it!!!

http://www.rrpicturearchives.net/showPicture.aspx?id=3110138

EDIT: If I'm understanding correctly, you tried the U25B trucks on the GP30 mechanism and it worked ok? You can get complete truck assemblies right from the Atlas parts department.

https://secure.atlasrr.com/mod1/itemdesc.asp?ic=9445300

That's what I was looking for, Thanks!!!!

Would these be for a GM&O?

Nope, Soo Line.

NBT

[kalbert]

Atlas and their well stocked and user friendly parts department are the best thing ever.

[Robbman]

Just swap the sideframe itself... you don't need to use the entire truck assembly.