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Old 03-09-2010, 06:41 PM   #1
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Post obx diff prep and install thread.

i received my obx diff from sparktec today and took it apart to inspect it to see what work will need to be done befor the install. i am doing this for information if someone decides to take this route so you will know what you need to do, and dont appreciate scorn being heaped on me for trying this unit..it cost me $400 usd delivered to canada so idont expect it to be of equal quality of some name brand diffs. 100's are being used every day with only a few failures..i know the risks and accept them.

on first impressions the diff looked pretty good. that casting was smooth with no inclusions visible.









i started stripping it down to get measurements for the bellville washers and bolts that i will be changing.. the original bolts were marked 12.9 but i will be changing them and thread locking things to be safe. all the bolts were the same length and none were stripped. the bellville washers, 7 of them stacked
()()()( will also be changed. i contacted richard bryant to get the washers and bolts and as this is the first svt diff he is supplying parts for he is giving me a $15 discount on the bolts/washers as i got to do some measuring for him.

he sent me this email on the subject of these diffs.

John,

It is a good design done with fairly low quality manufacturing.

Like you mentioned things are rough and should be deburred, the washers are junk, the bolts are sometimes overtorqued.

Other things like making sure that axle splines are tapered so you can get your c-clips out. Make sure the center sun gears aren't backwards (c-clip taper is on the correct side).
Make sure the axle fits and isn't too tight after the bearings are pressed on (they sometimes compress the holes a little).
Make sure the sun gears are machined squarely (problem with a run of neon differentials).
Check the runout on the differential (mainly a problem with one run of honda differentials where they are a little off center and wobble taking out bearings).

If it all checks out then you will be fine. Remember this design is MUCH stronger than a normal open differential. Even with poorer quality materials it won't have problems like spitting out diff pins.

If you have good mechanical ability and can check things out then it is worth the time to deal with them compared to a quaife.

-Rich





on further examination the cases will need some deburing and cleaning up on the inside as there are some sharp edges and the oil holes will need cleaning out as there is some swarf from machining. also the axle splines are not tapered as he mentioned so i will be fixing that with a lathe. on the whole the unit looks very sturdy and seems to be made of a pretty tough steel as i tried to mark it with a file and it didnt scuff it. not very scientific i know but its only an obx diff.





i will update this post as i complete the deburring and reassembly and instalation into the getrag tranny.


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Old 03-10-2010, 01:12 AM   #2
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irish i have to give u props for actualy going through with this after the bashing and all that was in your last post i realy hope you can get this to work as it will be a sumwhat low cost alt to the torson and the qualfe.
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Old 03-10-2010, 08:09 AM   #3
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Good luck... ill be watching. I hope everything works out
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Old 03-10-2010, 09:26 AM   #4
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thank you for doing this and not being like everyone else. i hate people who bash and dont know. atleast when your done you can be one of the first people to give praise or dislikes to this diff because you have real first hand knowledge on it and not a biased opinion from the start like some folks on here. im gonna be following this thread because i to see the potential in this product. also is there anyway you can speak with the guy who is supplying you with the bolts and washers and see if he could offer them at a set price for a kit for the focus. that way others who try this can just order the kit from him once they get the diff.
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Old 03-10-2010, 11:12 AM   #5
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the diff kit is the same for all the obx diffs.. thet are $32 shipped in the usa or $38 to canada. the kits are available from here

http://rbryant.freeshell.org/obx_washers.htm

he gave me a discount as i had to measure the bolts and washers so he can supply the kits. i gave him the info last night and the kit was shipped this morning.
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Old 03-10-2010, 01:13 PM   #6
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obx

Good luck on the rebuild, brings back memories as I did this a few years ago.
The material is extremely tough, had to use diamond burrs for the deburing part. Check the area where the bearing sits they were not flat or square on mine. I had about 12 hours at the surface grinder to true them up, so the bearings would seat flat. I replaced the springs but not the screws, have not had any trouble with it at all.

I might have some pics around showing the set-up I used for grinding, had to use a magnetic chuck on the harig spin fixture and use the side of a 100 grit wheel then keep redresing the wheel.
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Old 03-10-2010, 02:09 PM   #7
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This isn't a bash but...this is one of the main reason we recommended against the OBX for the *common* car enthusiast.

Show of hands...who here has access to a machine shop and 50 hours of free time to reinforce an OBX diff?

Ok, now, another show of hands...who here has the money to buy a Torsen and 2 days of down time to either install it or have a shop install it?

I do hope it works out for you, though. It would be douchey to say we hope it destroys your trans. Good luck.
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Old 03-10-2010, 02:55 PM   #8
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good start, could you get some better pictures that are not blurry though?
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Old 03-10-2010, 08:07 PM   #9
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my camera sucks..i'll try to get some better ones. i got all the deburring done tonite and just gave the holes were the wormgrears sit the once over with a fine stone. i checked for squareness and it all seems ok...just one thing. the diff WAS ASSEMBLED WRONG from the factory. the way it was set up under accel/diff locking the sungears would have been forced inwards compressing the bellville springs. this would have led to premature wear in the unit and clunking etc. i will be switching them during assembly and will show pics of the right and wrong ways to assemble this diff. i have seen this on quite a few posts so i guess this may have resulted in a few failures.i have checked online and found that although this diff uses the same principle as the quaife or torsen it in fact an entirely obx design as the quaife uses a 3 piece design and the obx only has 2 pieces.
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Old 03-10-2010, 08:18 PM   #10
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