7.5 rebuild help - TCCoA Forums
 
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post #1 of 8 (permalink) Old 01-11-2011, 07:18 PM Thread Starter
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7.5 rebuild help

Hey guys. Be easy on me, I'm new to this. I've searched this forum, as well as the rest of the internet, and can't seem to find any good, definitive tutorial on rebuilding these differentials. My plan is to swap the gears I have from the stock open diff to a trac-lok diff and put everything back together with new bearings and seals. Will I need to buy a book or DVD, or is there a good tutorial online?

Questions I have are:
1. I will probably be able to use the same size shims and spacers over again since I'm not changing the gears, right? I plan to double check anyways.
2. Is there a minimum torque specification that would show if my trac-lok is within the limited slip specification?
2. Is it typical to replace the straight roller bearings that carry the half shafts? I looked on rockauto.com, would they be called an 'axle shaft bearing'?
3. I saw a quick clip on youtube about tightening the pinion nut with a new crush spacer. The amount of torque that looked like was required looks nuts! He just kept tightening until the bearings were tight, and then used an inch-pound torque wrench to test the bearing preload. Is this the correct way to torque the pinion nut?

I'm sure I'll have more questions later when I get more info and actually dig into rebuilding this. Thanks everyone!

Last edited by foxk56; 01-11-2011 at 07:42 PM.
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post #2 of 8 (permalink) Old 01-13-2011, 10:50 AM Thread Starter
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Well I searched this forum harder another time, and turned up this EXCELLENT website for an 8.8 rebuild: http://www.angelfire.com/theforce/5o...5ohtech001.htm.

I would have to assume that a rebuild of the 7.5 differential would be nearly identical with some bolt torquing and backlash specifications being different, am I correct? Can somebody point me in the right direction for those specifications? I read somewhere that the backlash specification is around .001" for every 1" of ring gear diameter.

Last edited by foxk56; 01-13-2011 at 12:12 PM.
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post #3 of 8 (permalink) Old 01-13-2011, 12:49 PM
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It is easier to get a cheap 8.8 differential and put it in, you don't have to change anything to install the 8.8.
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post #4 of 8 (permalink) Old 01-13-2011, 01:57 PM Thread Starter
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You mean install an 8.8 diff in my 7.5 case? I've got all the parts I need except for the rebuild kit, so why would I bother trying to do that? The reason I wanted a 7.5 is outlined in this thread I created a while ago http://forums.tccoa.com/showthread.php?t=130984.

Still looking for some info.
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post #5 of 8 (permalink) Old 01-13-2011, 04:25 PM Thread Starter
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OK, I also found this info on my own. Here is a handy link for some bolt torque and bearing preload specifications: http://www.therangerstation.com/tech...nion_setup.htm

Another helpful link: http://www.themustangsource.com/serv...sis/Driveline/

Last edited by foxk56; 01-14-2011 at 06:55 AM.
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post #6 of 8 (permalink) Old 01-13-2011, 05:48 PM
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If that is what you want to do, I wouldn't waste my time on one, they cost more to build, parts are harder to find and they are weaker. 8.8's are readily available I'm sure I have 6 good used ones laying around here.
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post #7 of 8 (permalink) Old 01-14-2011, 06:40 AM Thread Starter
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Quote:
Originally Posted by dirtyd0g View Post
If that is what you want to do, I wouldn't waste my time on one, they cost more to build, parts are harder to find and they are weaker. 8.8's are readily available I'm sure I have 6 good used ones laying around here.
Alan
OK, granted I just found an 8.8 rebuild kit for $5 cheaper than a 7.5, if that's what you want to call cheaper...... but like I said I already have all the parts necessary (case, TL diff and gears) and as it is outlined in the thread I linked to, this is going to be turned by a 1000cc bike engine, so I am nowhere near worried about strength.

If I have any other questions during my rebuild I will be asking them on this thread.
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post #8 of 8 (permalink) Old 01-14-2011, 07:20 AM
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The 8.8 carriers are considerably cheaper.
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