For Those who installed an H1 box... - Page 5 - JeepForum.com
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post #61 of 368 Old 03-06-2013, 09:41 PM
fourbtgait
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The use of H1 boxes has me curious in regards to buying remanufactured.

Last year when I was searching posts, different forums, everyone talked of how crappy the rebuilds are for a stock CJ box, to never buy from a parts store, blah, blah blah.
Yet in regards to an H1 box, everyone buys from a parts store..... No mention of bad rebuilds.

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post #62 of 368 Old 03-12-2013, 04:20 PM
keith460
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Brown Santa arrived today with my H1 gearbox from O'Reilly's Auto.

I'll post more pictures as I change the stock power steering gearbox out for the H1 unit.




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post #63 of 368 Old 03-12-2013, 10:15 PM
TIPPEDITOVER
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I don't know if this has already been asked but how much different is the J20 steering box from the H1 box? I know a ton of people that switched over the to J20 box and love it. I don't mean to hijack the thread in a different direction or anything. I'm just wondering how similar or different the two box's are from one another. The J20 box has a 3.5" piston. Not sure how that compares. I put a J20 box on mine, haven't had a chance to use it yet. It bolted right in. It has a 13/16" X 36 spline input shaft. I checked out the H1 box's when I was shopping around and I could not find one as cheap as the J20 box. Maybe because it's that much better, I don't have any idea.
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post #64 of 368 Old 03-13-2013, 06:46 AM
lucdog
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Tippeditover, I've heard the same thing on the J 20 box.

I have a question about the H1 box, or I guess its closer to a comment.
The H1 box seems like it would have to be the same box as one off another vehicle. I have to think there wouldn't be that many H1's (were there many even bought by the general public) that would have needed a box replaced.
I would think the Military would replace a worn one with a new box, and throw the old one in the scrap pile as a core isn't needed with new.

Any opinions on this?

Bill

1957 WILLYS pickup,
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac.
1979 J20
1980 CJ5 trail Jeep.
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1989 YJ the CJ to YJ.
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post #65 of 368 Old 03-15-2013, 01:49 PM
Jacoby22
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Quote:
Originally Posted by keith460 View Post
Brown Santa arrived today with my H1 gearbox from O'Reilly's Auto.

I'll post more pictures as I change the stock power steering gearbox out for the H1 unit.



Keith,
Did you purchase this online or did you have to go to the store to order it? Wont let me order it online.
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post #66 of 368 Old 03-15-2013, 04:08 PM
keith460
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Keith,
Did you purchase this online or did you have to go to the store to order it? Wont let me order it online.
Ordered it online.

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post #67 of 368 Old 03-15-2013, 05:39 PM
rplivin
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I called and they said they could not get it as they were out of stock and didn't know when they will have any. I can't find one anywhere.
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post #68 of 368 Old 04-06-2013, 07:08 AM
keith460
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Finally got a chance to change out the Jeep OEM power steering gearbox to the Hummer H1 gearbox.

I can honestly say that it is a 100% bolt-on without the need to purchase additional parts for those Jeep owners who have factory power steering. No need to buy a manual steering coupling that is needed for the popular Jeep J20 steering gearbox changeover.

Here are some pics and torque values for the hardware.

Removal of OEM power steering unit.

Hydraulic line removal: 18mm flare wrench needed


Pitman Arm Nut removal: Puller and a heavy hammer to 'shock' the arm off the splines. Comes off easy this way.
Usually have a heavy dolly at the other end of the Pitman Arm to absorb the shock when hitting with a hammer but I couldn't hold that and the hammer while taking a picture.






Remove the Intermediate Shaft bolts at both ends to slide the shaft off the gearbox splines.


OEM gearbox is out with the mounting brackets attached as it is much easier to remove and install them this way.

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post #69 of 368 Old 04-06-2013, 07:17 AM
keith460
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Comparing the two gearboxes

The H1 gearbox is larger in size than the OEM unit because of the internal piston by about 11mm or 7/16".


The input shaft size and spline count are the same for both units. This is the area that counts when swapping out different steering gearboxes and was the reason one should use the Hummer H1 unit over the popular J20 unit.
Both gearboxes have 13/16" diameter input shafts with 32 splines each.


Both output shafts are the same spline count and diameter - 1-1/4".


As you can see, the H1 gearbox is all GM Saginaw

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post #70 of 368 Old 04-06-2013, 07:18 AM
keith460
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Installation of the Hummer H1 gearbox

First we mounted all the brackets back on the new H1 gearbox and torqued the bolts to 70ft/lbs.
Used a 7/16-14" tap through the threaded holes to clean them up first to get rid of paint and dirt.


Be careful choosing the length of the bolts because you don't want to force long threads into the cast housing that are too long. I used 7/16-14 x 1-1/4"L grade 8 bolts with a lock washers.




After the brackets were bolted back on, we mounted the H1 gearbox assembly onto the Jeep frame.


Bracket-to-frame bolts get torqued to 55ft/lbs.




After the H1 gearbox was mounted, it was time to align the steering wheel and Intermediate shaft back onto the box.
The H1 gearbox, and most ALL gearboxes have a flat spot on the input shaft that indicates center of the gears. It will be parallel with the top cover as outlined in the FSM.
I put the Intermediate shaft on loosely first so I could turn the wheel full left and right and stopped midway to ensure I was centered on the gearbox. Then used a straight edge to align the flat on the input shaft with the steering gearbox cover plate.


Now we attached the Pitman Arm and using a new nut, torqued the nut to 185ft/lbs.


Checked our alignment and adjusted the Drag Link a little but will make a final Drag Link adjustment once we get the Jeep back on the road for a test drive.
Torqued the Intermediate shaft bolts to 45ft/lbs and reinstalled the hydraulic hose fittings with new O-rings and that completes the install.




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post #71 of 368 Old 04-06-2013, 07:18 AM
keith460
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Test Driving

Wow, big difference over my stock power steering unit that I didn't think was a bit sloppy, but apparently I was wrong. The H1 gearbox really firmed the steering wheel feel while driving as it tracks straight without deviation. My steering wheel finally returns to center when completing a turn as I had a hard time before getting the stock gearbox to do.

I don't feel a real difference when parking or going slow, the H1 gearbox feels just like the factory unit but takes less turns of the wheel when parking. The real change is when driving, it feels like my wife's 2012 Ford Mustang when the steering setting is set to FIRM.

I really like this conversion and think it is well worth the cost and labor to do for those who have larger tires of 32" or more.

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post #72 of 368 Old 04-06-2013, 08:09 AM
Slydeco
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Keith your the best!
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post #73 of 368 Old 04-06-2013, 08:27 AM
Viencent
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Sweet going todo this swap this summer
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post #74 of 368 Old 04-06-2013, 08:41 AM
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Quote:
Originally Posted by keith460 View Post
Future test drive
I'm looking forward to the test drive.
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post #75 of 368 Old 04-06-2013, 08:42 AM
82JeepCJ7
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I did mine back in 1995. With out even knowing much about it (no internet then) I picked up a H1 box at at DRMO sale at Ft. Stewart. Took it home and swapped it in. Burped the system and its been on the Jeep ever since.

Beat it to fit, paint it to match!

Wheel, Wrench, Repeat.
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