Power Steer Ratio

[monza]

Hi all,

I have a 76 pwr steer box in my 75EB (PO)

Problem is the steering is very twitchy.

Any suggs on how to reduce the ratio ?

I am thinking swapping out the 13" wheel for a 15 might actualy be a smart move.

What about the box - any way to alter the gearing ??

Thx,

Monza. >-

 

[Bully Bob]

"I am thinking swapping out the 13" wheel for a 15 might actualy be a smart move."

Nope..., you don't want that..... [-X

"....any way to alter the gearing ??"

Not sure that's even poss. but, don't want that either. [-X

I have the same box & it's one finger :-& #036; steering on the hwy..., & one hand thru mogals & bouncy boulder trails.... :-"

Soooo.., someting else is amiss.., like the steering stablizer., toe in., caster....

 

[Rons beast]

Incorrect toe-in will make a vehicle "twitchy", or tend to dart to one side then the other when the wheel is turned. If the stearing box is adjusted correctly, and front end parts are all good...

Try this: With the wheels straight, safely jack up the front, and first check for any loose parts. Then mark each front tire with a line down the center of the tire tread by spinning the tire by hand and holding a pen or sharpie on the tread. (A friend is really helpful in this part) I found that keeping the pen on the ground and spinning slowly gives the best line. Doesn't have to be perfect, Just pretty straight all the way around.

Lower the truck back down, and slowly roll forward and back about 10 -15 feet to settle the front end.

Now get the friend and a tapemeasure and measure the distance between the lines at the front of the tire. Mark it down. Measure the same distance at the back of the tire. Compare the figures.....that's the toe. If it's more than about 3/8" Your toe setting is off. If it's 1/2" or more that is definitely a problem.

Good Luck

 

[monza]

looks like I might have used the wrong word - again :wacko:

when I said "twitchy" - I meant that its TOO EASY.

theres very little "weight" or "feel" to the steer.

One finger on the highway - and lock to lock in 4 turns - on a small (13") wheel.

The slightest movement and I'm off down a side street...

I was looking for ways i could either make the power assist LESS - or increase the lock to lock by a few turns.

Thats why i was thinking of a larger wheel - I would have to move my hand further (around a larger circumference) than on a small wheel.

BUT,

Since tere are no shouts of "hey change the gear out for a larger/ smaller one..."

THEN I guess my options are:

Get used to it.

Swap the box for the earlier 6:1 ratio.

Go BACK to non power steer.

hmmm...

How exactly does the powr steer work ?

What exactly happens between the pump and the box ??

Monza

 

[Bully Bob]

Where's your pics..?

We need to see what pump is on there....need to see the pumpkin angle to the fr. dr. shaft....

As we've said; Toe-in & caster are pretty much all that can cause that.

If your front tires are neutral or somewhat toe-out....it's "Catie bar the door"..!!!!

What's the resistance while sitting still..?

"What exactly happens between the pump and the box ??"

Hi pressure hydraulics :-&

 

[monza]

alright, alright...

I will do the 'toe' check thing. :blush:

then take a couple of pics.

Monza.

 

[Bully Bob]

You can just measure outside edge of the front of the pass. tire to outside edge of dr. tire. (say approx. 15" above floor)

Do the same on the back outside edge of the back of the front tires.

The dist. on the front should be approx. 1/8" shorter than the rear.

This would be a good place to start. >< <'>

 

[monza]

Did a quick check on the Toe - seems to be okay - I will have to do a more thoro check tho.

I am digging into the PO pwr steer parts - so I know what i am dealing with.

Pics attached.

As far as I can tell the Gear is a Saginaw - but it looks longer than any of the pics in the manuals ??

The Pump seems to be an original Ford Thompson (?) - which seems odd cuz most people swap to a Sag when they do the pwr steer UG.

Any help identifying the parts would be great.

Opinions on whether this is a bizarre combo also appreciated.

If anyone knows the flow rate and pressure this pump puts out that would also help a bunch.

Once I know exactly whats on there i can start making **informed** decisions.

Thx.

Monza. >-

 

[Bully Bob]

It's me again... /

That appears to be all stock, orig. EB power steering. You can tell by the box...it will have 3 bolts holding it to frame. It may have even been on there fr. factory. If add on later., you can tell by the steering shaft.

You're still being stingy with pics & info.

Stablizer.???

Tires..???

Diff. pinion angle..???

I think you're chasing a ghost.... The pwr.steering is fine.. :-B

I would be suspicious of the front end installation/work. The str. wheel should roll back to center (mostly) when you release it aft. a turn.

Wrong C-bushings or maybe their upsidedown.... /emoticons/[email protected] 2x" width="20" height="20" />

 

[monza]

Bully Bob

It's me again

Yeah - we're saved. /emoticons/[email protected] 2x" width="20" height="20" />

That appears to be all stock, orig. EB power steering. You can tell by the box...it will have 3 bolts holding it to frame. It may have even been on there fr. factory. If add on later., you can tell by the steering shaft.

PO did say he put a 76EB pwr steer on.

I know the shaft is custom - I will upload a pic tmrw.

You're still being stingy with pics & info.

Stablizer.???

Tires..???

Diff. pinion angle..???

Yes - WH Stabilizer.

33x12.5x15

I will grab more pics then - what exactly is Diff pinion angle ?

I think you're chasing a ghost.... The pwr.steering is fine.. :-B

You are CORRECT - the pwr steer is fine - BUT I want it to be less assisted.

Once i know for sure what equip I have - I can work on reducing the pressure from pump to gear.

I would be suspicious of the front end installation/work. The str. wheel should roll back to center (mostly) when you release it aft. a turn.

Wrong C-bushings or maybe their upsidedown.... /emoticons/[email protected] 2x" width="20" height="20" />

I will grab a pic of the C bushings as well ( I know the PO replaced them).

Jeez at this rate we might as well just move in together... /emoticons/[email protected] 2x" width="20" height="20" />

Back soon. Monza. >-

 

[Bully Bob]

"what exactly is Diff pinion angle?"

Front lower U-joint on dr. shaft..., where it bolts up to the differental (need a side view pic., not close up., but fr. a distance, say about fr. the front tire so as to see that angle.)

"I want it to be less assisted.

Once i know for sure what equip I have - I can work on reducing the pressure from pump to gear."

I don't think that's possible...this is prob. the least powerful unit made.

The pump only applies press. when you move the steering wheel.

It doesn't continue a turn to the stops automatically. i.e. when you stop moving the str. wheel...the pressure stops.

Take the belt off & you'll appreciate what you have. AND., see if it (steering) returns (or trys) to center after a turn. If it stays locked in turn, it's an assembly issue in the front end changes. (assuming toe-in is correct.)

 

[monza]

Bully Bob

"I don't think that's possible...this is prob. the least powerful unit made.

The pump only applies press. when you move the steering wheel..."

I did a bunch of research on this.

Lots of people prefer to have the 'assist level' reduced - especially racer types.

Of course you can buy expensive pumps and gears to mod the steer.

BUT - check this article out, it'll make u go "*** - omg" /emoticons/[email protected] 2x" width="20" height="20" />

http://www.moparaction.com/tech/beep/PUMP_IT_DOWN-re-v1.4.pdf

"Take the belt off & you'll appreciate what you have. AND., see if it (steering) returns (or trys) to center after a turn. If it stays locked in turn, it's an assembly issue in the front end changes. (assuming toe-in is correct.)"

That is GREAT test - i will give that a whirl.

I will get some of those pics up in the next day or so.

back soon.

Monza. >-

Hey,

Should I be posting under "General EB" or "EB Tech" ??

 

[Bully Bob]

Chrysler (Mopar) did have the worst., (meaning the most easy) P/S back when.

I can see why "they" found ways to slow it up.

"...posting under "General EB" or "EB Tech" ??"

Doesn't much matter...that I'm aware of. This is more of a Tech. issue.