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Go Back Forums > Archives > Bronco Chat - Archives

View Poll Results: Are you happy with your JP rockeater gears
Yep! 3 18.75%
No, would spend the money on a stak 9 56.25%
No, would buy the tera low 3 18.75%
No, shoulda stuck with the stock ratio 1 6.25%
Voters: 16. You may not vote on this poll

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Old 06/03/08, 06:31 AM   #1
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burn baby burn

Columbus, IN
Joined: Nov 04
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Anyone running the Jack O'brien JP rockeater gears

Anyone running these? Thoughts? I understand that I can buy a Stak for the same price, but I do not want to modify my exhaust, mounts, driveshafts, etc to make the change.

Are the rockeater gears any good, are you happy with them? I run trails, rocks, etc. Not a lot of mud or, I think the gear ratio will be fine.
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Old 06/03/08, 06:52 AM   #2
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I did the Terra low upgrade to the Dana 20 with the output shaft, very happy for not alot of $$.
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Old 06/03/08, 07:15 AM   #3
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I did the same.
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Old 06/03/08, 08:06 AM   #4
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Adapt and overcome

Maricopa, AZ
Joined: Jun 02
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I knew some people who were running them. Quality part, geared too low, too expensive. That loss of the window of gears between low and high range was often an issue. By the time you bought the gears and upgraded the output shaft there are better options now.

currently running tera-los, happy with them. Would like to go to a Stak

"She's built like a steakhouse but she handles like a bistro"-Zapp Brannigan
“How hard can it be?”-Clarksonius 4th century BC.
Full throttle, it either solves the problem or ends the suspense.
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Old 06/03/08, 10:16 AM   #5
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If You're Going to Do It, Over-do It

Phoenix, AZ
Joined: Dec 02
Posts: 8,317
I had a long conversation with Jack Obrien (got the impression that it's not possible to have a short conversation with him), when I called to ask about his heavy duty detent springs.

Jack is a metallurgist by trade. He went into great detail about the difference between his gears and the stock Spicer and the TeraLow gears. There really is no comparison between the manufacture and heat-treating of his gears and any others. This accounts for the difference in price.

Unfortunately Jack does not have a Web site, nor does he advertise. He says he relies on word of mouth only. I did find out that he offers a full range of gear ratios for the Dana20, not just the 4.86 (or whatever that ratio is) gears that have been offered by a couple different vendors. He also offers a full range of rebuild parts (most of which are better than stock) for the Dana 20, including shift forks.

When I talked with him, maybe a year and a half ago, Jack claimed that he could build a Dana20 that would be as strong as an Atlas, for something close to the same price, but, obviously, with none of the fitment issues.

I have TeraLow gears installed also, and am very happy with them. But, if I ever get to the point where I feel the need to upgrade my transfer case, I will give Jack a call.

'70 Sport, 351W EFI, NV4500, D20 w/Teralows, 4.56s Dana 44 w/Ox and 9" 31 spline Detroit, 35" KM2's, 3 1/2" lift, 2" body lift, 4x4x2 PS, some other stuff I forgot about...

"If it's got tits or tires it's gonna be a problem"
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Old 06/04/08, 09:47 PM   #6
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to alcohol the cause of and solution to all of lifes problems -Homer Simpson

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what are the costs up to now?

The Great Pumpkin stock 302, C4, 2"body lift and 3.5" Stage II Duffs long travel suspension, Goodyear 35" MT/r's. Gallery page 71 3rd one down. NEXT mod: rock skis!!!!!!!!!!
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Old 06/05/08, 05:56 PM   #7
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I had the tera lows, just not low enough, got A steal on A tcase with O'Brian gears, love them, already had WH output. With granny low I can go hi side when needed. Now the tera lows are in the wife's mall crawler with NP435

71 bc 31/2fr 41/2r 38X15.5 MTZ locked both ends 140-1 crawl ratio
67 302 3 1/2 duff 37" MTR's
2000 F250 4x4 Powerstroke tow rig
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Old 06/05/08, 06:14 PM   #8
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El Dorado Hills
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I will be going with the O'brien gears when I can afford them...
I have talked to Jack a few times.... wow I think my ear still hurts.. He makes good products!!

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Old 06/05/08, 08:58 PM   #9
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Crawler Creations LLC

Arvada, CO
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Posts: 933
Originally Posted by 77BroncoWag View Post
what are the costs up to now?
I would like to know as well. Anyone know?

Built, not bought!
There is a fine line between "hobby" and "mental illness"
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Old 06/18/08, 09:22 PM   #10
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Columbus, IN
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Originally Posted by 73bronco View Post
I would like to know as well. Anyone know?
Just about $2700 with all the options. Freakin pricy.
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Old 06/18/08, 09:26 PM   #11
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Crawler Creations LLC

Arvada, CO
Joined: May 07
Posts: 933
WOW!! Thats for sure!! I get the stak or atlas is the way to go! Thanks!

Built, not bought!
There is a fine line between "hobby" and "mental illness"
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Old 12/07/08, 11:23 PM   #12
Joined: Nov 08
Posts: 3
Does anyone have Jacks number?
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