Apex Kodiak

I'm planing my build and when it comes to hi steer, I have a question. I recently picked up a steeing box from a 90 4runner. My friend has a 86 box in his 93 sas pickup. He said his box will work better than the one I have in my truck due to fame width and box throw, and that we should make a deal and trade. I've heard that the 90s boxes are better? I have a 85 pickup that needs some love, so I'm gathering parts to rebuild the front suspension and axle, and ditch the push pull steering. So I guess my question is what's better for my needs?

FattMaanLittleTruck

89+ are stronger boxes from what I hear.

you'd be a fool to trade.

xxxtreme22r

Kinda Confused here. If you have an 85 pickup and haven't converted it to crossover just yet, your box isn't the same as 86-88 and 89-95 boxes. They aren't more powerful boxes without the matching power steering pump which is a higher pressure unit. There is also a slight difference in steering shaft length, but they work across all years. You just have to move the splines a little on the gear box or the steering shafts.

P.S 86-95 boxes are not completely bolt on onto the 84-85 or any other push/pull truck either.

Apex Kodiak

I know my box isn't the same, and I know that it isn't just bolt on. I was asking if one or the other is more desireable. I'm not gonna mess with the power steeeing pump.

xxxtreme22r

As far as box goes, I don't think there will be any difference between them all. As it's the pump that makes the difference. Personally I would run a matched set, but that's just me. Preferably the later model pump/box.

BigBluePile

iTrader: (3)

I believe there may or may not be a difference in turning ratio between early and later IFS gearboxes....

windedwalrus

if i remember corectly the difference is in the inner shaft diamiter, one is larger than the other but i don't remember what years. i think its the earlier boxes that are stronger.

xxxtreme22r

if you look in the fsm's it gives the line pressures for both systems. The higher pressure is the later style boxes.

windedwalrus

found the difference the earlier style uses a large bearing for the input shaft (stonger). later boxes used a realy small bearing. bolth boxes mount and turn the same but the 88-86 is stronger and alittle shorter from the inputshaft to the base.

86-88 left side------------------------------------------------89 and on right side

(pic borowed from trail gear)

xxxtreme22r

I guess it depends on how you look at stronger then. Line pressures are higher on the later style boxes meaning the power steering is stronger then the earlier boxes.

Apex Kodiak

So what I'm getting from this is when used with later models ps-pump, 90's boxes are have higher pressure. 86 88 boxes have a bigger berring though. Do they mount the same? With the 90 being longer.

xxxtreme22r

a little tweaking but I have had both in my 87.

scuba

http://www.pirate4x4.com/forum/showthread.php?t=587515

windedwalrus

i'm running an 88 pump with a 90 somthing box pushing 33's and a locker and havn't had a problem yet.

BigBluePile

iTrader: (3)

Indeed. Like I said...

shaferziroc

[QUOTE=windedwalrus;51779081]i'm running an 88 pump with a 90 somthing box pushing 33's and a locker and havn't had a problem yet

so if i have a 1988 can i use a 1991 pickup box on it or will the 1inch differance make it not fit? will the shaft from a 90 fit in a 88?

shaferziroc

what tweaking?

RoBatt

Bump to an old thread cause no need starting a new one...

I have a 1989 steering box sitting in my garage right now. I had bought a bunch of SAS parts including a 1987 steering box that had already been drilled and tapped for hydro assist.
In attempt to sell my 1989 box i realized that it is more desirable than my 87 box thats already installed. Would it be worth it to swap out my 89 box with my already installed and tapped 87 box? Is it that big of a difference?

millball

If it ain't broke, don't fix it. small difference.