My Dif Pin

[MelectroK]

Any suggestions?

There seems to be quite a bit of failures of the dif pin. I do drive the car somewhat agressivly, but spin tires if i can help it. I dont have the money for a quaife dif like everyone keeps suggesting, and especially to get a rebuilt tranny. Is there a way to replace the pins with something stronger, to know they wont break? I looke threw some older posts but didnt get a answer to a question exactly like this.

 

[pjtoledo]

The dif pins and spider gears are made with good materials. It's a lack of lubrication that kills the difs/trannys. The stock dif assembly has almost no way of getting lubricating fluid in to the spider gears. That causes the spider gears to gall the pins, eventually the friction causes the pins to rotate, which shears the retaining pins, then ka-boom, the pins are free to be ejected.

Perry

 

[NetNinja]

MelectroK

You're kidding right?

Do a search here for all the people who like to do burn outs with a stock diff.
Also there is a thread here somewhere about trying to strengthen the Diff.

Either buy a Quaife or get yourself a spare transmission.

 

[MelectroK]

So it is impossible to replace these pins?

 

[Bizzy]

Nope, not impossible at all. You just have to remove the tranny and open the case, remove the gear shafts, pull the diff out, tap the old pins out, tap the new pins in and reassemble. A job well worth the work IMO.

 

[revhardSHO]

there is/was a diff service kit that included new pins, but i think the whole kit is obsolete now.

Any machine shop should be able to make or already have pins that will work. I have heard that using a slightly oversized pin will cut down on the failure.

 

[pjtoledo]

So it is impossible to replace these pins?

The pins are replaceable. IF somebody sells them,,,, I have no idea on that one. It's a hassle though, gotta pull the tranny, open it up, drill out about 10 or so monster size rivets, open up the dif case. Then drive the retaining pins out and remove the full pin and 2 half pins. The spiders come out next,,,they wear on the pins and need replacing too. Sounds easy eh?


Perry

 

[MelectroK]

replacing the whole diff is easier?

 

[masho95]

The pins are replaceable. IF somebody sells them,,,, I have no idea on that one. It's a hassle though, gotta pull the tranny, open it up, drill out about 10 or so monster size rivets, open up the dif case. Then drive the retaining pins out and remove the full pin and 2 half pins. The spiders come out next,,,they wear on the pins and need replacing too. Sounds easy eh?


Perry

Ummm no. You don't have to disassemble the differential to replace the roll pins (which hold the differential main pinion and 2 side pinions in place, and are what cause a differential failure). You tap them out with a drift, and then tap out the pinions, and then replace.

 

[pjtoledo]

Ummm no. You don't have to disassemble the differential to replace the roll pins (which hold the differential main pinion and 2 side pinions in place, and are what cause a differential failure). You tap them out with a drift, and then tap out the pinions, and then replace.

That is true. But,,, You will be putting new dif pins inside the worn spider gears. It won't take long for those worn spider gears to grab the dif pins and twist them. What starts this whole mess is the spider gears rotating on the dif pins. Both the dif pins and the inside of the spider gears wear. When enough friction builds up the spider gear seizes the dif pin and forces it to rotate, the roll pins are either sheared off or pushed out of the way and the dif pins are now free to be ejected. So, yes you could just replace the dif pins, but you will only be replacing half of the worn parts.

Actually I was sort of joking around about how easy it would be to fix a tranny.

Too bad we have to turn,,,in a straight line the spiders do not rotate on the dif pins and they would last forever. But what fun would driving in a straight line be??? Heck, it's usually over in just a few seconds!!!


Perry

 

[MelectroK]

k guess ill just see how long they last then

 

[Chris Benvie]

See how long it lasts and start saving for the Quaife. You can pull a junkyard tranny for under $200, add a quaife and a refresh and new axles. Your looking $1800-2000 and never have to worry about it again.


Best idea...IMO

 

[TYSHO]

If you're worried about the "shafts" ejecting due to a sheard roll pin...welding does wonders!

 

[Bryan C. King]

It's a hassle though, gotta pull the tranny, open it up, drill out about 10 or so monster size rivets,

Why the need to take the ring gear off?

As soon as I can get a spare diff, I will be working on a project that I have talked about with my machine shop.

 

[TYSHO]

Why the need to take the ring gear off?

As soon as I can get a spare diff, I will be working on a project that I have talked about with my machine shop.

As in how, keeping the shafts in place or the lubing?

 

[pjtoledo]

Why the need to take the ring gear off?

As soon as I can get a spare diff, I will be working on a project that I have talked about with my machine shop.

The differential case halves and the ring gear are all held together by the same rivets.

Perry

 

[Bizzy]

You don't have to remove the ring gear to replace the pins or the pinion shafts, but if you want to replace the spider gears as Perry describes the diff case has to come open, in which case the rivets do have to come out. Boo Hiss.....that's the worst part of doing a quaife install.

Edit: And it would help a lot if I read the entire thread, then I would have seen that Perry already answerd the question.

 

[TYSHO]

You don't have to remove the ring gear to replace the pins or the pinion shafts, but if you want to replace the spider gears as Perry describes the diff case has to come open, in which case the rivets do have to come out. Boo Hiss.....that's the worst part of doing a quaife install.

Just ah FYI...you can always buy a new ring gear from AutoZone for $39.99 besides hassling with the rivets. That's if you go with the Quaife though.

IMO, if you believe the inner opening of any internal differential gears are worn...I would leave it like that and replace the shafts only, if worn, because if you replace the spider gears it'll have more friction, as both are new, non-worn. The gears inside pretty much hold theirselves in shape, like a cube. The shafts just keep them from free spinning in the inside, which would make the differential useless.

 

[autobahnsho]

IMO, if you believe the inner opening of any internal differential gears are worn...I would leave it like that and replace the shafts only, if worn, because if you replace the spider gears it'll have more friction, as both are new, non-worn.

Although I've never messed with the tranny, I'd agree.

I put a new chain on my 3yr old, 3000miles+ bike, and it kept slipping on the gears in the back. The chain and the gears wear together, so if you replace one piece you'd probably have to replace them all.

(I put a new gearset on the back and the bike is now fine.)

 

[Bizzy]

Just ah FYI...you can always buy a new ring gear from AutoZone for $39.99

I've never seen a ring gear from Autozone and because of that I can't say they are good or not. But at 40.00.......I'd be worried. I would have to get one and compare it before I give it my stamp of approval. If you have a part number please supply it.