Tapping a Stock Steering Box for Hydro Assist - 87-01 Steering Box

joe98tj

Moderator
Figured I share my experience. In one video someone mentioned this same box style was used from '87 - '01/'02.

I followed the following two videos:

Bleepin Jeep - full tear down and tap: https://www.youtube.com/watch?v=d7BESAD_EIY&t=864s

Drilling and tapping without disassembly: https://www.youtube.com/watch?v=SQlAscIxfaY

Its probably about an extra hour to take apart and put the box back together. For me well worth it since I'm not the lucky or patient type to make sure no metal shavings got inside.

Following the videos alone makes this an easy at home job. It's one of those, if I can do it, you can do it too. But this was also a spare box I got for 50 bucks so I was not that concerned with messing up.

One thing not shown in the bleepin jeep video is when he removes the steering gear (cover with 4 bolts) he turns the gear inside to access the ball bearings. I just removed it with the ball bearings in at a controlled environment so I did not lose any ball bearings.

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Another thing that doesn't get explained well, especially not helpful when you are not familar with NPT taps, is NPT taps. Both videos just say drill a hole and use the tap. Doing some research online shows a special drill bit should actually be used to, I think, create the taper for the tap to go in easier. Just following the bleepin jeep video I used a 29/64th drill bit and tapped the holes. No issues using a regular drill bit but I'm assuming I put much more strain on the tap.

I would also recommend buying two taps like mentioned in the bleepin jeep video and cutting/grinding one down. I tried to get two but between lowes and home depot I could only find one so I ended doing what the guy in the other video did, tapping both holes with the normal tap, then grinding the tap down and going back to both holes.

Another thing to mention is check your tap set to make sure its going to work. If you watch the second video you'll see the guy uses a wrench, would not recommend that if you're not good with taps like myself. You really need an extension setup like in the bleepin jeep video. I used the setup below but it took two of us to make sure the tap was going in straight.

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Other than those things I followed the bleepin jeep video to the T and it got the job done.

Disclaimer: When I say I tapped the holes I mean my dad since he saw me pull out the tap set and goes "You want some help with that" and just took over. Probably worked out for the best that way...

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Great write-up Joe. Yea, Dad taking over isn't always cool. Look at it this way, he screwed up a bunch of tapping jobs in his day to assist giving you better chance of success first shot.
 
Great info Joe!  At work we use 7/16" drill for 1/4-18 NPT taps.  On cast iron, just go slow and back out every quarter turn
 
JeepinMaxx said:
Great info Joe!  At work we use 7/16" drill for 1/4-18 NPT taps.  On cast iron, just go slow and back out every quarter turn
7/16" is recommended. The guy in the bleepinjeep video suggested 29/64th for this application.

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Very nice. How was reassembly? Or is that yet to come? Are you planning to just run ATF in the steering system? I know when Ian ordered his blue top and did his hydro assist, the company he got the box from said that's all they ever use.
 
RedJeepster1 said:
Very nice. How was reassembly? Or is that yet to come? Are you planning to just run ATF in the steering system? I know when Ian ordered his blue top and did his hydro assist, the company he got the box from said that's all they ever use.
Have not gotten that far yet. Was going to start re assembly today. Still need to do some research on fluids and such.

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Alan Jr. said:
RedJeepster1 said:
Very nice. How was reassembly? Or is that yet to come? Are you planning to just run ATF in the steering system? I know when Ian ordered his blue top and did his hydro assist, the company he got the box from said that's all they ever use.
Have not gotten that far yet. Was going to start re assembly today. Still need to do some research on fluids and such.

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this is what I used
https://lucasoil.com/products/hydraulics/lucas-universal-hydraulic-fluid
 
Damn Joe! That looks great! Nice write up, and the video was awesome is breaking it down! Any particular reason they pulled the ball bearings out and you were able to keep them in?
 
Chubby Thumbs said:
Damn Joe! That looks great! Nice write up, and the video was awesome is breaking it down! Any particular reason they pulled the ball bearings out and you were able to keep them in?

They didn't want to lose any of their balls. I just pulled it out slowly into a pan so that they didn't go flying.

The problem I have now is trying to figure out if the ball bearings are different sizes like in the bleepin jeep video and I cant find my caliper
 
They said they were different color nickel vs. stainless, you should be able to visually discern them, theoretically!
 
Chubby Thumbs said:
They said they were different color nickel vs. stainless, you should be able to visually discern them, theoretically!
I tried for half an hour to eye ball it and no shot they look any different from one another

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