Rear wheels lock up

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I have a 71 c10 (w/air) converted to 4x4 Truck with a 396 th400/205 d60 ft and 14 FF rear (drums). I cut off the rear brake pressure regulating valve from the FF. I later found this valve is $250.00 at the dealer....

I have new 1/2 ton Master Cylinder and new 1/2 ton proportioning valve. The rear brakes lock up VERY easily.
Question. Do I REALLY need the rear brake pressure regulating valve? I am sure others are running without it. What did you do to stop the rears from locking up?
The only thing I can think of is the 1/2 ton brake MC and prop valve.

OR
The Dana 60 has the wrong brake lines and banjo fittings?
I had these custom made using Teflon braided lines and banjo fittings. I could not find the dana 60 brake banjo/bolts. I am wondering if these tiny holes in the teflon brake lines and banjos are my problem?
Anyone have thoughts suggestions? I really want to fix this ASAP. Thinking of going to a brake specialist. Or talking to Dynatrac... and buying there D60 parts.

I also bled the brakes three times, and changed the front pads, thinking they are glazed.

Roads, where we're going we don't need...roads. - Doc.
'73 Blazer, 383 - 3/4 ton, ARB F&R, 35"

 

[Triaged]

As long as your are getting fluid to the front calipers I wouldn't worry about the size of the brake lines (thye squirt fluid when you bleed them...right?). You don't need much flow just preassure. To keep the rear brakes from locking up I would install a adjustable prop. valve. You can buy them from summit for around $30. Install it after your 1/2 ton prop valve (which is for a disc brake truck...right?) and you will be able to adjust it till the brakes both lock up at the same time.

'71 Blazer CST w/ a 400sbc, 4" lift, 36" Supper Swampers, and alot of rust
<a target="_blank" href=http://community.webshots.com/user/triaged>See it Here </a>

 

[TopOff]

Yeah, I was thinking of an adjustable proportioning valve... The only one I saw was the Wilwood one. It was $94.00. Cheaper than the rear pressure regulating valve.

Doesn't anyone else have this problem with the 1 ton setup? What was there solution?

Roads, where we're going we don't need...roads. - Doc.
'73 Blazer, 383 - 3/4 ton, ARB F&R, 35"