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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 03-09-2011   #1 (permalink)
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Default Ford 8 rear end rebuild parts

So I decided to take the safe route and buy the parts to rebuild, rather than buying the whole pumpkin. So on that note, what are all the parts needed to rebuild? Here's what I got"

Trac-loc, 3.25 gears, new seal kit, and bearings for trac loc. Am I missing anything else?
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Unread 03-09-2011   #2 (permalink)
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Pinion bearing, ...do these have a crush sleeve? If so you'll need one of those. Other than that...you'll find out when you get in there! lol You'll like the trac-loc. Do you have a shop manual? Of all the things I've done, mechanically speaking, I've never set up a rear end gear set. Sounds interesting. Good luck
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Unread 03-09-2011   #3 (permalink)
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Yes, he'll need a new sleeve. As for the bearings, you'll be replacing the mains, you should also replace the pinion bearings. There are three, just like with a 9".
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Unread 03-09-2011   #4 (permalink)
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You may need a big impact, like 3/4 or 1", I don't know if a 1/2" one can develop the 250-300ft lbs to get the nut off, or maybe a 3/4" drive set and a 6' cheater bar. I've never done one also. Good Luck.
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Unread 03-09-2011   #5 (permalink)
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Quote:
Originally Posted by David Suesz View Post
Yes, he'll need a new sleeve. As for the bearings, you'll be replacing the mains, you should also replace the pinion bearings. There are three, just like with a 9".

Just curious, is it really necessary to replace the sleeve? I just read this from Vintage Mustangs:
crush sleeve replacement 8" ? - Vintage Mustang Forums
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Unread 03-09-2011   #6 (permalink)
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If you are replacing all those bearings, etc., it will be much less expensive to buy an R&P installation kit which has all the stuff in it to begin with - including the crush washer. The crush washer might be reusable but then again it might not. Since they come in the kit you won't have to wonder if it will, or won't work. You shouldn't be using an impact to set the crush; you can easily overshoot the desired pinion pre-load and also potentially damage the new pinion bearings you just installed. Using an impact to take it apart is OK provided you plan to toss the bearings anyhow. The repeated impacts can brinnell and ruin the bearings.

If it all comes within torque specs using the old washer then all is well. Problem is, you don't know if it will be that way until AFTER you try to set it up. If its not OK then you have to remove the outer pinion bearing which requires ruining the pinion oil seal and potentially damaging the outer pinion bearing as well. A pinion oil seal by itself costs more than a crush washer - why risk using the old washer?

The kits have seals, bearings, shims, marking compound, etc., and some even have the outer axle bearings and seals. I think I mentioned it before but the early V8 axles use a special (smaller) axle seal that is not in the kits but available at AutoZone.

The 8" uses a slightly smaller crush washer than the 9". The individual crush washers you buy at the local parts store are all for the 9" models. Since I bought the Ratech 8" installation kit I can tell you that it has the correct crush washer for an 8". I don't know about the other brands. The 9" crush will likely work but since you have to crush it about twice as far as an 8" one it may well take more torque to crush.

Since you are replacing the actual differential with a Track-Loc its somewhat irrelevant but... After having bought and installed the parts I can confirm that the internal parts kit (differential gears and shaft) for the 2-pinion, open 8" diff are identical to those for the 9" except the roll pin that retains the spider gear shaft is a different size. No one claims to sell those parts for an 8" but the 9" kits they all sell use the same parts except for supplying a larger pin.
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Unread 03-09-2011   #7 (permalink)
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You have a link to the kit?
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1966 Ford Mustang Original 289
Edelbrock RPM Performer Heads; bored .30 over
Weiand Stealth Intake, Holley 600 CFM Carb.
Comp Cam 268H 9.5:1 Speed Pro Pistons
Patriot Tri-Y Headers w/ 2.5" H Pipe, Flowmaster 40S
Air ride system with 4 link CSRP Front Disk Brakes.
Ford 8 3.40 trac-loc rear end
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Unread 03-09-2011   #8 (permalink)
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Here would be a listing of the various ones available from Summit. Scroll down...

Motive Gear F880325 - Motive Gear Ring and Pinion Sets - Suggested Parts - SummitRacing.com

I bought this particular one partly because I wanted axle bearings/seals and, also, they didn't have any of the Motive install kits in stock. Without axle bearings they are about $25 less. Having axle seals included (2 sizes actually) is irrelevant - they won't fit your car unless its a 6-cyl or later than a '66.

Ratech 3007K - Ratech Deluxe Ring and Pinion Installation Kits - Overview - SummitRacing.com
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