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Question: 39,5 TSL....do I need a special steering setup?


patov6

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Hi guys,
I´m looking for 39,5 x 15 TSL....do I need a special steering setup? Do you think the stock setup is capable to move those shoes:)? Or do I need to modify something? maybe replace the stock pump for an AGR...o something similar?

Thanks in advance,

Pato

(*) Sassed D44 CrMo 97 Ranger.
 


MAKG

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The same power steering pump and gear are used on MUCH larger trucks than Rangers, so I doubt the hydraulics are going to be an issue even with tires that big.

What might be an issue is the steering linkage geometry with the large lift you're going to need to clear tires that big. You might be able to get by with a drop Pitman arm (if you're using a suspension lift), or perhaps with Stupidlift's "Superrunner" setup. If neither of those gets rid of the bump steer, you're going to have to go custom, perhaps a "swingset" geometry. Note that there IS no truly correct TTB steering geometry, as it would require running the steering linkage through the axle arms (the Pitman arm wants to be BEHIND the axle arms, but the tie rod ends need to be in front). It's all about how close you can get.
 
patov6

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MAKG said:
The same power steering pump and gear are used on MUCH larger trucks than Rangers, so I doubt the hydraulics are going to be an issue even with tires that big.

What might be an issue is the steering linkage geometry with the large lift you're going to need to clear tires that big. You might be able to get by with a drop Pitman arm (if you're using a suspension lift), or perhaps with Stupidlift's "Superrunner" setup. If neither of those gets rid of the bump steer, you're going to have to go custom, perhaps a "swingset" geometry. Note that there IS no truly correct TTB steering geometry, as it would require running the steering linkage through the axle arms (the Pitman arm wants to be BEHIND the axle arms, but the tie rod ends need to be in front). It's all about how close you can get.
Click to expand...
Thank you very much MAKG! Now its clear for me that, I can put 39,5 with the actual steering pump. My truck is no longer TTB, now is SASSED, with a new steering geometry. Now I´m running 36"x13.50 IROKS (In fact, 36,8" x 14.50, because they are bias), so I think the additional inches wouldn´t be a problem.
Thanks again, and best regards,

Pato
 
4x4junkie

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Yeah, you should be fine as long as you're moving slightly.

The Ford power steering isn't exactly the greatest (somewhat weak pump), although a ram-assist setup would give you all the turning power you'd need.
 
4x4junkie

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I don't have experience with it, but I'm sure anything will help.

I'd probably go the Saginaw route myself.
 
patov6

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4x4junkie said:
I don't have experience with it, but I'm sure anything will help.

I'd probably go the Saginaw route myself.
Click to expand...
Junkie, do you know if AGR pumps are bolt on, on ranger gearbox? or I have to make some mods?
 
metalmacguyver

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it will bolt right to the bracket and the lines should have the same fittings.
 

biggjake8788

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I ran those same tires on my 87 with full widths for awhile and never could tell i was turning anything but stock until it got hot, put a cooler in the system and run it
 
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