Stubbs, Thanks for the input. I've come to the same conclusion, I'll have to use the F3 power kit. The sideframes will be donated by a Williams 44 tonner (another project), That is why I asked about the side frame interchangeability. I know I'll have to purchase a coupler for the rear truck. However, I modified the Lionel pilot (cow catcher).



As you can see from the photo, I've closed the pilot and removed the coupler. I think I can fabricate a conversion mounting bracket which I can mount the Lionel pilot to on one end and mount the other end onto the Williams front truck.

The only real problem will be to fabricate a mounting plate for the two trucks that replicates the williams design. I have a Williams F7, that I can use as a pattern. Then mount these plates onto the Lionel frame, attach the motors/reverse unit, add new LED headlight, ERR sound commander, etc...

This is gonna take a while.

Mark

Thanks 3rail. Yes, I was wondering about a williams for williams swap of the side frames.

So, the only difference is in the fly wheel. I was thinking the differences were in the way the power trucks mounted to the frames, as the F3 may be different than the F7. I can Live with modifying the frame, but was hpoing for an easier work around.

Can I assume the side frames are interchangeable?

I have a post war Lionel 2333 F3 I've custom painted. I want to replace the original "growler" motors with a WBB re-power kit. WBB makes an F3 and an F7 re-power kit.

What are the differences between the two (other than the obvious that,  one is for F3's and the other for F7's)?

Which would work better in my application to the 2333?

Secondly, Are the side frames interchangeable between the two?

Any help would be appreciated. Thanks.

Mark