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Topic Summary

Posted by: dat
« on: April 14, 2014, 04:04:59 PM »

Herm the OD Guy uses Crown parts, Walcks used Omix ada,   I haven't heard back from Novak yet, but they are more than double the price of the others, so hopefully they are better, hate to chunk extra money in for the parts
Posted by: Carls_jeep
« on: April 09, 2014, 11:12:24 PM »

Peter, FBill fairly covered the issues. The parts are simply not up to specs. The blocking rings wear out fast and the tapers on the overseas input shaft and second gear are rough or undersize. It doesn't take long for hard shifting or failure to shift into second and third to appear.

If you do a search on this site and the CJ2A site about tranny/transfer parts you will find a lot of info.
Posted by: PeterL
« on: April 09, 2014, 07:37:55 PM »

This is a copy and paste of an email I received from Novak.� I was not given an option for NOS and it seems as though they are comfortable with Crown parts.�

Hi Peter:

No worries, and please don't apologize, I completely understand. They are not re-boxed parts. We get most of the T90 parts from Crown and some from AllTrans. There is only one part from Omix that we occasionally use (an adjustable Dana 300 twinstick kit). Do keep in mind that the quoted kit includes a rebuild kit too. Here is a link to the rebuild kit:
http://www.novak-adapt.com/catalog/transmission/transmission_parts/t90_parts.htm

Regards,

Posted by: NoCoWillys
« on: April 09, 2014, 04:06:03 PM »

@PeterL,
When I got my parts from Novak, (other than the rebuild kit) they were NOS and coated in very old cosmoline.  I think when they called me they gave me the option of NOS.  I picked NOS. 
Posted by: dat
« on: April 09, 2014, 03:18:55 PM »

Walcks just e mailed back, it is what they sell as a rebuild/ parts kit, they said they didn't have any trouble .

I probably would still be more comfortable finding parts here and there then getting a bearing kit.  hmmmm, what to do :-/

"We sold many of these kits with no problems. We don�t keep selling parts we have problems with.

I would sooner have a happy customer than have to ship stuff back and forth so we try to get the best parts available."
Posted by: F Bill
« on: April 09, 2014, 02:47:50 PM »

The shafts typically are way too soft..or are just plain old cold roll made to look like a hardened shaft.
The gears also have dimensional inaccuracies.
The synchros are known to have inaccurately made dogs that will not allow shifting to happen, or they act worn out upon assembly.

I have not really heard of anyone putting together a transmission with Crown or OMIX parts that lasted any length of time, and most are bad upon installation. It can be really frustrating.

Rick Stivers has a t-90 rebuild guide and some of this is explained in there..

Good parts are getting increasingly harder to find......ebay is actually a decent source for some, but you have to know what you are looking at.
Posted by: Mike S
« on: April 09, 2014, 02:08:41 PM »

When I re-built my T90, I got the T90C input shaft and gear cluster from Herm.
Posted by: Jesse
« on: April 09, 2014, 01:01:48 PM »

The metalurgy is not correct. There is a shade tree way of testing the hardness of the main shafts and whatnot. It goes something like putting a punch on the shaft and dropping a 2 pound hammer on it from such and so height. An original or well manufactured one will be hard enough to deflect the hit pretty much unscathed. Hitting the poorly made one drives the punch clean through the shaft and into...Australia I suppose.


-Jesse
Posted by: PeterL
« on: April 09, 2014, 12:29:02 PM »

@ Carlsjeep -

What fails?� Are we talking sprocket failure, metal particle failure? Are they not fully hardened?� If so is the case hardening simply not deep enough?� Can the failure be attributed to a poor rebuild?� Telling me that something built overseas is junk does not explain why.� I am not trying to start an argument.� I just want to know the root cause of the failure.� I want to think beyond "it's junk" and understand what about it is poorly manufactured.

 I rebuild many motors here in my shop that are manufactured in Asia.� I also rebuild items manufactured in the US.� I can tell you that failures rates are just about identical.� So I reiterate my original question- What fails on the gears?

Oh yeah, Novak does obtain parts through Crown.� Crown obtains items from overseas......I would like to entertain a guess that those parts are also coming from the pacific rim....
Posted by: Carls_jeep
« on: April 09, 2014, 10:47:38 AM »

Here's my advice.

Do not buy transmission or transfer case parts made overseas, PERIOD. If you do, you WILL rebuild them again real soon. The parts are worthless and will fail soon if not immediately.

If you do a search of this site and the CJ2A site you will soon find out that anyone that uses overseas parts have rapid failures.

Buy only NOS parts or parts made in the USA. There are still NOS parts available on ebay and other sites and from the early Jeep dealers on this site.

Some are, Novak, DeBella are two. Search and call them are request NOS or USA made parts.

PLEASE don't buy overseas parts, unless you want a failure.
Posted by: NoCoWillys
« on: April 09, 2014, 09:51:38 AM »

I'd definitely give Novak a call and see what they would price it out for you at.  It's top quality stuff.
Posted by: dat
« on: April 09, 2014, 09:45:46 AM »

I need the whole mess, gears, shafts, all,  my case in good though, that's the bright side I guess.   ;)
Posted by: NoCoWillys
« on: April 08, 2014, 07:32:30 PM »

I had the same concern when I was looking at rebuilding my transmission.  I ended up going with Novak Adapters for my rebuild kit.  Everything I saw pointed me to them.  They have lots of NOS parts and put together a top notch kit.  Very reasonably priced.  From what I heard about the omix parts is that they are not machined as well, made with inferior quality metal and people find that parts don't fit well.  The main shaft I've been told by omix can easily be marked up (soft metal) unlike stock or NOS parts and will likely wear out very quick.  Check out novak: http://www.novak-adapt.com/catalog/transmission/transmission_parts/t90_parts.htm

I needed a new main shaft and they supplied that for me as well.  It was NOS.  8-)
Posted by: PeterL
« on: April 08, 2014, 07:12:31 PM »

Dat,

I have the same question.  I have asked a bunch of people.   No one seems to like the Omix parts/gears.  When I ask why I am never given a specific reason.  I prefer data rather than analogies.  So, for clarity sake, can anyone describe specific problems they have had with Omix gears? 
Posted by: dat
« on: April 08, 2014, 04:01:02 PM »

 not looking for a fast solution, I figure I'll rebuild, just trying tyo decide on parts now, well and how to come up with the spare cash for parts