Front end pancake and castor mod in one

[63inoz]

Just about to do a pancake on the 63 crossmember, read everything i can find on it, very confident, have all the tools etc.
While deciding whether to go 1.5 or 2" I realise that taking 2" out of the front still leaves plenty, but out of the back leaves it very thin in the centre section.
Then I get thinking why not take more from the front than the back, say 1/4 - 3/8 extra. That would give about 2-3 degrees of extra castor angle built in.
For a truck riding high enough in the back to take a load that would level it out, 90% of the time while driving empty its sitting about say 2" higher at the rear wheels than the front.
The front LCA cross shafts arent horizontal in that case 90% of the time. In fact the suspension is leaning forwards, the pitch centre is raised and probably promotes dive.
I guess a lot of guys on here who say they came up with zero - 1 degree of castor may have that same nose down stance.
I also intend to do THE castor mod by redrilling the cross shafts at about 1/2".
Anyway if anyone can point out to me the obvious problem that I have totally overlooked I'd be very pleased to hear about it. I havent been able to find anything on it here but if anyone remembers a previous discussion it would be great to get a link. If anyone has done this before I'd like to hear about the success or otherwise.

[tinydb84]

I believe you are limited to 1.5 inches due to the steering hitting the LCA. Your upper control arms are mounted at an angle to promote anti dive which would be increased. Not sure how much of a difference it would make though.

[63inoz]

Thanks for replying David,
Ive been reading through your builds, pity about the photo bucket thing, but you have a very interesting approach.
Its encouraging to see guys like yourself doing things outside of the box
And now I feel like i need to spend a few hours running practice tig beads before i cut and shut the crossmember, otherwise the results might be too embarrassing to post up here. Your rows of dimes are beautiful.
Anyhow as no one has come up with anything against the plan, I have a spare day tomorrow with pancake on the cards.
Ive made up the bracing and marked up with 1.5" out of the back and an extra 5/16" out of the front. That will give about 2.5 degrees of extra castor. I expect it will be months before this thing hits the streets so nobody hold your breath waiting for a road test.
I'll post some pics in my build thread.
Cheers
Tony