9 inch open differential

[bn69stang]

A lot of those 8.8 s have 31 spline axles in them though , and detriots all the way . Bud

[Ratbird]

I finally got the old 3rd member pulled. Here are some pictures, they mean nothing to me, but maybe you guys can tell me if this looks like a normal "open" differential.

[Ratbird]

Hm, it only added one of the pix. I think I should start shooting these photos in a lower resolution because after I make them small enough to post they look terrible.
Here's another picture.

[fe66comet]

Looks like the trac- loc I have sitting in the barn. Limited slip standard ford.

[machoneman]

2X to that!

[Ratbird]

How would I be able to tell if it's an open (as I was told by the seller) or a trac-Loc? Is there a tell tale sign some where that will let me know for sure?

[Heo]

if you have a clutch inside the dif.(like a motorcycle clutch with multi discs).Its not an open one

[machoneman]

See Kevinstang's great write up; see Trac-Loc details near the end.

http://www.kevinstang.com/Ninecase.htm

[fe66comet]

The simple way is an open differential has the pinion gears exposed so you can see them. A locker or limited slip has a closed case which contains clutch packs, springs or a ratcheting mechanism to apply power. There are exceptions like heavy truck and air locker rear ends.

[bn69stang]

All my factory trac locs have recessed bolt area where they mount at the ring gear , kinda like a shoulder around the bolt where as the open one the bolt is level , that s how i searched for them in the junk yards anyway.. Bud

[fe66comet]

Want another low milage one bud. It came out of my Comet with 40000 miles and 3:50 gear.n

[bn69stang]

Yeah Jon you give me  $ 50.00 and i ll take , will put it on my toro lawn mower ...   lol   Bud

[fe66comet]

I thought of building a post hole digger out of it LOL

[Ratbird]

Does anyone have a picture of how the strap style yoke and u-joints should look on a threaded yoke? My old one had the standard old u-bolts with nuts, but this yoke takes a strap and I've never seen one. Found one at a local parts store but the bolts are 1/4 too long, the yoke threads don't go quite all the way through.

thx, Dave

[Ratbird]

Well, I found u-joint straps that fit across the 2 holes on the yoke, and also have the 1350 size caps. Problem is they don't reach the yoke when installed. (see the picture) Even though they aren't tightened down you can see the straps won't contact the yoke.
I'm guessing that I will have to call Roush Yates and ask them what straps to use, or where to get them as I can't find anything online about them.
I did find some articles about drilling out the threads on the yoke to be a 5/16" through hole, then use a u-bolt like the stock differential would have. Is that a bad idea??? I would think that the threaded ones are better just because that's what Roush Yates had on them.
I took it for a roll around the block and boy does that Detroit locker cla-clunk, cla-clunk, clu-clunk around corners! Are they really suppose to be that noisy? I don't mind cuz it's a Rat kind of car, but I just want to make sure it's normal.

thx for any input on these rookie questions.

Dave J