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Anyone running the Jack O'brien JP rockeater gears

Are you happy with your JP rockeater gears

  • Yep!

    Votes: 3 18.8%
  • No, would spend the money on a stak

    Votes: 9 56.3%
  • No, would buy the tera low

    Votes: 3 18.8%
  • No, shoulda stuck with the stock ratio

    Votes: 1 6.3%

  • Total voters
    16

smoked77

Sr. Member
Joined
Nov 15, 2004
Messages
691
Loc.
Columbus, IN
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 sand.....so, I think the gear ratio will be fine.
 

mtfit

Bronco Guru
Joined
Jun 29, 2004
Messages
1,012
Loc.
pa
I did the Terra low upgrade to the Dana 20 with the output shaft, very happy for not alot of $$.
 

Broncobowsher

Total hack
Joined
Jun 4, 2002
Messages
34,833
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
 

70_Steve

Old Guy
Joined
Dec 13, 2002
Messages
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.
 

wilson

Full Member
Joined
Oct 26, 2003
Messages
226
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;D
 

Daddy4zack

Sr. Member
Joined
Aug 27, 2004
Messages
833
Loc.
El Dorado Hills
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!!
Aaron
 

73bronco

Sr. Member
Joined
May 10, 2007
Messages
936
WOW!! Thats for sure!! I get the stak or atlas is the way to go! Thanks!
 
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