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 Post subject: Can't get a straight answer
PostPosted: Tue Aug 05, 2008 7:38 am 
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Here is e-mail conversations I had with a company that makes differential gears. They are American made BTW. They list gears for the Liberty, but the gears for the front are for Dana 30's. Do they mean Dana 30a? Probably not. He keeps saying Dana 30, which would mean that didn't know what is actually in there.

To follow the correct order start reading at the bottom going up.
Terry

The closest ratio to 4.88 that we offer is the 4.56 which fits the stock 3.73 carrier.The part number for the Dana 30 front is SD3005.The 8.25 part number is SCR82505.You will need a special cross shaft pin for the 8.25 differential.The part number is 80-0278-1.

Thank You




"Terry McGee" <XXXX@earthlink.net>
08/04/2008 08:49 AM Please respond to
themcgees@earthlink.net


To "mike.ashley@regalbeloit.com" <mike.ashley@regalbeloit.com>
cc
Subject Re: Jeep Liberty 4X4 2005







I have a 3.73 in the front and the back right now. The back differential is the Chrysler 8.25 and as I stated the front is a Dana 30a. The best I can get for the front is 4.10's. If you make a 4.88 for BOTH differentials that is what I want.

Terry

Terry & Kay McGee
XXX@earthlink.net



----- Original Message -----
From:
To: XX@earthlink.net
Sent: 8/4/2008 8:37:36 AM
Subject: Re: Jeep Liberty 4X4 2005


We offer the Dana 30 ring and pinion.Which ratio are you looking for and what is your stock ratio?



"Terry McGee" <!!!!!!@earthlink.net>
08/04/2008 05:13 AM
Please respond to
:lol: @earthlink.net



To sales@richmondgear.com
cc
Subject Jeep Liberty 4X4 2005









I notice that you list various gear ratios for the above Jeep Liberty. It is stated that they fit the Dana 30. The 2002 through 2005 front differential is a high pinion Dana 30a. Gears for a Dana 30 will NOT work. Are your gears in fact for a Dana 30a?

Terry


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:shock: @earthlink.net

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 Post subject:
PostPosted: Tue Aug 05, 2008 7:42 am 
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Ask for gears for a FIA186MM diff,the actual name for the D30A case.


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PostPosted: Tue Aug 05, 2008 7:46 am 
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tjkj2002 wrote:
Ask for gears for a FIA186MM diff,the actual name for the D30A case.


Thanks, I'll do that. I couldn't remember who posted that before. It was you...of course!

Terry

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PostPosted: Tue Aug 05, 2008 6:35 pm 
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I thought 4.10's were the lowest gear ratio available for the D30a. If that is the case his 4.56's are for the regular Dana 30

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PostPosted: Tue Aug 05, 2008 6:57 pm 
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Oh and I forgot right at the monement there is no 4.88's for the 8.25.Superior gears was rumered that they where working on 4.88's for the 8.25 but that has yet to be realized,so your stuck with 4.56's as the lowest gears for the 8.25.


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PostPosted: Tue Aug 05, 2008 7:05 pm 
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Here is his latest e-mail to me. I answered him back and I'm waiting for a reply. Apparently this company makes their own gears, mostly for racing.

COPY OF EMAIL: Terry,
We are not able to crossover the number. We list the Jeep Liberty as using the standard Dana 30 in the front. By chance do you have a reverse cut gear?

Thanks,
Mike


What in the world is a "reverse cut gear"? I also invited him to join the forum so he could talk to someone that understands what he is talking about!

Terry

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PostPosted: Tue Aug 05, 2008 7:37 pm 
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Fulltimer wrote:
Here is his latest e-mail to me. I answered him back and I'm waiting for a reply. Apparently this company makes their own gears, mostly for racing.

COPY OF EMAIL: Terry,
We are not able to crossover the number. We list the Jeep Liberty as using the standard Dana 30 in the front. By chance do you have a reverse cut gear?

Thanks,
Mike


What in the world is a "reverse cut gear"? I also invited him to join the forum so he could talk to someone that understands what he is talking about!

Terry

Quote:
Reverse-Cut vs. Standard-Cut:

Often mistakenly referred to as "reverse rotation," the term "reverse-cut" is perhaps the single most misunderstood term by four wheelers and even many in the axle business. A reverse cut housing is not just like a standard cut housing turned upside down. It is a specially designed housing for fount driving axles. Contrary to popular belief, it does not turn backwards or in reverse. The term "reverse-cut" actually refers to the direction of the spiral cut in the ring gear.

In a reverse cut axle, the spiral on the ring gear is opposite form a standard -cut ring gear. The idea behind reverse cut is to strengthen the operation of the gear when it is used for a front axle application.


In the early day of four wheel drive, the front axle used the same gears and housing as an ordinary rearend. This was done for economic reasons, since the components were already in mass production. They simply added the necessary parts to enable steering. However, all ring and pinion gears are cut in such a way that they are inherently stronger when pushing the vehicle in the forward direction and weaker when driving in reverse. That means that a standard cut (rearend style) gear, when used in the front, must push on the weaker side of the gear to move the vehicle in a forward direction.

This practice continued until the late 1970s, when Dana designed a new axle that would be stronger for front axle use and also provide better driveline angles for the shorter front driveshafts then being used in new trucks. The reverse cut housing and reverse cut gear set can be identified by the pinion gear, which is located above the centerline of the axle shaft. Therefore, standard cut gears are always strongest when used in rear axles and reverse cut gears are stronger when used in front axles.

Reverse cut axles have also become popular for lifted short wheelbase vehicles like Jeeps, early Broncos and Land Cruisers. The reason is because the higher pinion location greatly reduces rear driveshaft angles. However, not all reverse cut axles are strong enough for use as a rearend. The cut of the gear that makes them stronger for the front axle use also makes them somewhat weaker for the rear axle use. The best and most popular reverse cut axle for rearend use is the Dana 60, a good choice because of its large ring gear diameter, tooth strength, ability to accept 35 spline axle shafts and wide selection of ratios and differentials.

Two other reverse cut axle are the Dana 44 and a new Ford 8.8" reverse cut. The Dana 44 makes an excellent front axle, but just isn't strong enough for rear axle use. The Ford 8.8", reverse cut rearend (new from Currie Enterprises) has a slightly larger ring gear than the 8.5" of the Dana 44 but is not nearly as strong as the Dana 60, which has a 9.75" ring gear. The new 8.8" uses a special third member that bolts into a removable carrier Ford 9 inch housing and its sometimes mistakenly referred to as a reverse cut Ford 9 inch. Both the Dana 44 and the ford 8.8" can accept a maximum of a 30 to 31 spline axle shaft.

The bottom line is that reverse cut gears (front axle style) and axle assemblies are inherently stronger for front axle use because of the way the gear mesh when moving the vehicle forward direction. They also provide better driveline angles because the pinion is located above the centerline of the axle. The gear set used in each type of axle are not interchangeable. Standard cut gears cannot be used in place of reverse cut and vice versa. The housings are also not interchangeable. However, differential cases, be open, limited slip or locker are compatible with both styles, as long as the spline count matches the axle shaft.

-Reverse-Cut vs. Standard-Cut taken from FourWheeler January 1999


From the looks of it the D30A is not a reverse cut diff,the HP30 is that's in some XJ's.


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PostPosted: Wed Aug 06, 2008 2:48 pm 
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I thought the reason you couldn't use standard D30 gears was that the D30A had a longer pinion?

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 Post subject:
PostPosted: Wed Aug 06, 2008 7:15 pm 
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chefdab wrote:
I thought the reason you couldn't use standard D30 gears was that the D30A had a longer pinion?
That is also correct but the D30A uses standard cut gears also.The low pinion D30 and HP30's uses 2 different gears also.


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PostPosted: Wed Aug 06, 2008 8:14 pm 
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A 4:56 would be nice............................................

Maybe you can talk them into making some gears for the KJ? And maybe we could get enough people to commit so the manufacturer would be tempted to produce them. That’s a lot of maybe’s but you never know until you try! :D

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PostPosted: Wed Aug 06, 2008 9:11 pm 
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maybe...................... :shock: :shock: :shock: :shock: and I know from at least what my Grandfather said that people in......... well you know down below want ice water too! :lol: :lol: :lol: :lol:

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PostPosted: Thu Aug 07, 2008 12:18 am 
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He never did answer my last e-mail. I think he either gave up or is checking into what I have told him. At the very least they know that the Liberty does not have the Dana 30.

Terry

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