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post #1 of (permalink) Old 01-02-2005, 11:56 PM Thread Starter
 
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making a high pinion

What is all involved with making a diff high pinion? is it as simple as flipping the housing and installing reverse rotation gears? is it a smart idea to install a thrust block such as with the truehi9.com housing? i was planning on either doing this with a dana 44 or a ford 9.
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post #2 of (permalink) Old 01-03-2005, 08:37 AM
 
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Re: making a high pinion

I believe one thing you would run into is pinion oiling issues.
The casting is a little different to control the lube to the high pinion position.

I know this doesn't answer your question, but...
Rather than reinventing the wheel, why don't you just use a HP44 out of a late 70's Ford?
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post #3 of (permalink) Old 01-03-2005, 09:25 AM
 
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Re: making a high pinion

[ QUOTE ]
why don't you just use a HP44 out of a late 70's Ford?

[/ QUOTE ]
exactly. if the housing is on the wrong side, then just swap tube sides and make it what ever you want. i personnally have made a passanger side drop HP d44. it wasnt to bad.
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post #4 of (permalink) Old 01-03-2005, 10:12 AM
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Re: making a high pinion

As I was told by a diff specialist:
In a "reverse" rotation the pinion is trying to push away from the ring gear, causing the housing to split easier.
In a "normal" or forward rotation the pinion is "pulling into" the ring gear.

That's why it's much easier to break your diff pulling in reverse than forward. Like backing up hard or pulling someone backwards. (Yup, after I blew a few I found out.)

When you flip the axle over, you are running the gears backwards like you were in reverse. A reverse cut on the gears helps, but ---.
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post #5 of (permalink) Old 01-03-2005, 11:49 AM Thread Starter
 
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Re: making a high pinion

Well i need the high pinion for the rear of my cj5, so wouldnt it make any high pinion axle want to pull apart? how does currie, dynatrac, etc, fix this problem with their hipinion rear axles?
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post #6 of (permalink) Old 01-03-2005, 12:17 PM
 
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Re: making a high pinion

[ QUOTE ]
Well i need the high pinion for the rear of my cj5, so wouldnt it make any high pinion axle want to pull apart? how does currie, dynatrac, etc, fix this problem with their hipinion rear axles?

[/ QUOTE ]

They use reverse cut ring and pinion just like factory uses when they install high pinions in the front of Fords and Jeeps. Been doing it for years with no issues and mine works quite well.

But you don't want to flip over a rear end to make a high pinion because of lube issues. The internal housing shape has a lot to do with the way the lube is moved around. This is what I read on the Currie web site years ago, don't know how correct it was but it sounded good [img]images/graemlins/grin.gif[/img].
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