I know what I'm about to say is probably not recommended but since I've gotten my turbo I like to race from a roll on the freeway with sports cars. There have been a couple times at over 120 mph (speedometer buried) that I've tried to slow down pretty quick and when I do the truck gets pretty squirrelly. I did a hydroboost conversion on my truck last year and I don't really feel my problems have to do with a lack of braking power. I feel like it might be more of a suspension thing or something else.

My truck is a ecsb 2wd with a torsion bar front suspension with just a 2" drop shackle in the rear. I don't really want to lower the truck any more than what it is but if thats what it is going to take to get it more stable at high speeds I'll definitely consider it. I know my shocks are kind worn out and want to replace them but I don't want to buy shocks for my current ride height if I'm going to need to get another set if I lower it more.

As for tires I have some 305/50R20 Nitto 420s on a 8.5" wide wheel. So I was thinking that down the road maybe a wider wheel or something with a shorter sidewall might help.

Also would something like a ******* speedstur tonneau cover help me out any at high speeds.

I'm just kind of throwing things out there I think might be a problem but if anyone has any actual experience with what it take to be more stable at high speed, especially braking, I'd appreciate the help.

 

Well, what kind of actual brakes are you running??

Just stock fronts with rear drums or do you have aftermarket brakes up front?

 

Once I lowered my front of my truck 2" and 4" in the rear added 14" rotors up front - it was not as scary - anything over 130+ (efilive scanning) was scary the truck was floating wipers came on around 140- (I was young and dumb for the record trying to impress buddy's) (never again on the streets to many people I could hurt)

Anyhow you have to realize it's a full size truck going way to fast for what it's designed for and it's going to be sketchy unless suspension gets really changed around

I'm running 295/45/20 general uhp tires

Good luck

 

12" rotors up front and 13" SUV rotors on the back. The truck came with 13" rotors up front and drums in the rear originally but one of the previous owners for some reason like a retard put the older style 12" brake on the front when they did the disc brake conversion on the rear.

Yeah I know it's dumb. I had a little reality check yesterday when I started to get sideways at over 120 trying to slow down for a retired highway patrol car that still had some of it's stickers on it.

 

you need a chute.

 

Maybe did the brake conversion smaller for different smaller wheel packages. Rotating weight is something to think. How big of wheels you run.

 

I doubt it the truck had 20's when I bought it.

 

I think your shocks are the main culprit, and the front springs too soft for the speed you have written a confession to.
My truck with bilsteins and stock suspension has no squirreliness stopping from those speeds.

 

I would be willing to bet money on the Prop valve. Rear drums require a different prop valve than rear discs do.

Also...seems like a whole bunch of changes have happened to your brake system..I would go with an adjustable prop valve and dial things in a bit better.