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Mustang Technical Discussion > Pre 1973 > Windsor build - best starting block? > Community Forums > Mustang Forum Australia - Mustang Tech

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Windsor build - best starting block? Reply to topic

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hybrid
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Oh if there is a kit that's designed for the truetrac, then it might have the right bearings.
But if it's just a generic 8" install kit like I got with my 3.8 gears, then it will just have the 8" carrier bearings.

These are the bearings I bought.
www.summitracing.com/parts/rat-9011

Not sure if you can find any info to compare them to what's in your kit.
What's the part number for your kit?

If you look at the required parts for the truetrac, it lists bearings and they are all 9" based.

www.summitracing.com/p...uiredparts

Also, here is the truetrac on Jegs site.
www.jegs.com/i/Detroit...6/10002/-1

See the note on the page:

Note: Must use Ford 9" carrier bearings.
Timken P/N's LM102949 & LM102910.


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smh00n
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OK. Looks like they don't do a kit for the true trac into 8" (opening there for a bright young lad).

Thanks for the confirmation. I saw that on Jegs and did wonder but checking Eaton and Richmond sites they didn't mention it.


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smh00n
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were the ratech Timkon bearings? My diff builder only wants them


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hybrid
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It looks like they are timken.

ratechmfg.com/fordstandard.htm

Looking at the carrier bearings on that page, they list timken part numbers:
9" 2.891 Carrier Bearing LM102949 (2)


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trav68
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I think most of the rebuild kits come with an option of Timken. Often the part number designates (T) at the end if this is the case otherwise it may come with Koyo's etc etc.

I bought a motive gears 8" kit to suit the truetrac. I had to source a pilot bearing and retainer locally as they incorrectly supplied in kit.

I might have the part no of kit if you are interested or otherwise check the Motive Gears Ring and Pinion catalogue for part numbers.

Cheers,

Trav.


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hybrid
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Not sure what brand my fitting kit is. I'll check when I get home.


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xpconnor
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Summit do do a kit for the true trac just give me a minute and I will chase up what I ordered.


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xpconnor
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OK here is the kit you want for the 8 inch diff when installing a true trac

www.summitracing.com/i.../overview/

When I got this kit all the bearings were Japanese made Koyo bearings except for the small pilot bearing which was made in China. You would easily be able to source a single separate pilot bearing from a bearing shop if your not happy to use it.

And here is a blog I found when I was researching whether Ratech/Koyo bearings were any good or not.

www.practicalmachinist...od-226913/


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hybrid
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Just checked my kit. It's from CJ and has all Timken bearings, though I won't be able to use the carrier bearings in this kit. I'll use the ones that I bought with the truetrac.

www.cjponyparts.com/ri...3/p/RPM1K/



I wonder why they don't include that retainer if it's required to be replaced. They supply everything else. Or is that it sitting on top of the small bearing?


Last edited by hybrid on Fri Jul 07, 2017 4:29 pm; edited 1 time in total

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trav68
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Yep I think it is on top of the pilot. Circular retainer with tangs/fingers around the OD.

Your pilot looks right size too MG supplied me with a monster must have been from a 9" or something.


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xpconnor
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Yep retainer is on top of the small pilot bearing in that photo. I know you said they are all timken bearings but just for interest sake can you double check the small pilot bearing and see if it is made in China.


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xpconnor
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Oh and check the length of the ring bolts. They should be a little longer for the true trac. Not sure how critical this is but Trav did mention it when I was researching it for my diff rebuild and the ones in the kit I got were a little longer then the ones I removed from the old diff.


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hybrid
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xpconnor wrote
I know you said they are all timken bearings but just for interest sake can you double check the small pilot bearing and see if it is made in China.


I didn't even look at the small bearing. It doesn't have a brand on it, or where it's made.
Just says R1558 TAV on it.

Just got shipping confirmation from summit.


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xpconnor
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Similar to in my kit but mine had made in China on it. I'm not really qualified to comment as my diff might blow up the minute I fit it to the car but for the amount of km's these cars are going to do as weekend drivers I don't think it's a huge problem. Anyway we will all find out the quality of the kits over the next few years I suppose.


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smh00n
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First of the engine bling arrived today

I'd stick up a pickcha but I get this message: Sorry, but the maximum filesize for all Attachments is reached. Please contact the Board Administrator if you have questions.


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