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I have parts off a 1990 trooper but they look different. Well the main difference is the pitman arm. Can I get a pitman arm for an earlier year and use this steering box? Or is the sector shaft a different size? Also I need to know, how do I mount the pump to the block? what brackets do I use or do I need to custom make one?

Go the the Board index on the left hand side of the purple bar above. Then click on Stock trucks, there is a "STICKY Thread", I think it's the 3rd thread listed and it covers this very subject. Great thread with Pics and how he did it. I think your parts might be a little to NEW but not sure.

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In life there is the "Way things should be" and then "There's the way they are".

2005 Silverado 3/4T Crew Cab
1981 Luv 2WD
1979 Luv 4x4 Currently going through Open Heart and Cosmetic surgery
1995 Roughneck JetBoat
1981 Luv parts trk

Having done dozens of these, here is one suggestion. The new steering box shaft is .110 largers than the old one. PM me and I will send you some pictures of the two, side by side. I have a machine shop nearby that enlarges (machines with CNC) and respines the old pitman arm to fit your new box, this costs $85. but makes it possible to use clear up to 87 Isuzu Pup P/steering boxes!! I've read where some guys have cut the end off their old two hole pitman arm and the newer one hole type and welded them together but I 'm a little reluctant to weld on my steering parts. If you decide to go the way mentioned above, I can ship one out to you almost immediately since I have them on the shelf. As far as brackets, you will probably have to make some up? Good luck,
dusty

i think this is the thread you want to look at...

viewtopic.php?f=5&t=17910&hilit=trooper+power+steering

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U DON'T HAVE TO CUT LIKE THAT USE TH TROPPER SHAFT