Author Topic: Catastrophic Failure.. (Read 4497 times)

Bruce · « **Reply #30 on:** August 21, 2004, 01:02:06 AM »

How are the diff gears?

Lanny · « **Reply #31 on:** August 21, 2004, 08:17:47 AM »

Hi Bruce..I haven't pulled the diff apart yet. Are you interested in putting the beast together? Do you have a 71-72 case for sale? Gimme a call 604-202-7810

Sparkmaster1 · « **Reply #32 on:** August 21, 2004, 06:30:29 PM »

Yes that is a pretty wimpy looking roll pin in there. I think I'll investigate and see if I can tap mine for a long set screw. Like a 3/4\" long 8/32 or something along those lines. Tim

Cameron · « **Reply #33 on:** August 21, 2004, 07:51:40 PM »

Quote

Yes that is a pretty wimpy looking roll pin in there. I think I'll investigate and see if I can tap mine for a long set screw. Like a 3/4" long 8/32 or something along those lines. Tim

Is the pin running parallel or perpendicular to the axles?

Sparkmaster1 · « **Reply #34 on:** August 21, 2004, 07:59:34 PM »

It's a diff that's in my car right now but I'm pretty sure it runs parallel. I just went and looked a stock diff. Pin Runs perpendicular and with a very large pin. Once again the forefathers already had it figured out.. Tim

volksbug · « **Reply #35 on:** August 22, 2004, 12:28:30 AM »

If you don't find a case i probably have something, you're talking 71-2 irs with sleeve for throwout brg.? Marcel

Bruce · « **Reply #36 on:** August 22, 2004, 01:22:13 AM »

I talked to Lanny Sat afternoon and if anyone has a 71-]early 73 DSC IRS case, he'd like to buy it. He has no leads yet. If you have a 71 or newer swing axle case, that will be the same. He's considering complete cores too.
Note: all 71 and later cases have the guided TO bearing. We'll even consider a '70 case. Those have the bosses for the studs that hold the TO bearing guide, so they can be converted easily.

Black-Back · « **Reply #37 on:** August 22, 2004, 11:23:01 AM »

Question about the 71-] cases, what is the special significance/difference about them? Are they stronger or something? Bruce......help.......

Mike

Bruce · « **Reply #38 on:** August 22, 2004, 12:46:43 PM »

Nothing special about them. In fact they are the second most inferior IRS case to use in an IRS application.

With VW transmissions there is a simple progression. The newer it is, the better. Since high volume swing axle trans sales ended in 68, using a 71 case gets you a few of the improvements of the later years.

It gets you the larger pinion bearing that started in 69 (or 70?).

Then it gets you the superior guided throw out bearing that started in 71. If you've ever heard of the TO bearing clips falling off, that problem is isolated to early TO bearings only. The later ones can't fall off since they are integral to the TO bearing.

Black-Back · « **Reply #39 on:** August 22, 2004, 01:09:14 PM »

Thanks Bruce, in terms of strengthening a tranny for street and strip abuse, what are the most important modifications that need to be done? I mean I know that you install a superdiff, to gain the two extra spider gears, but what else would you need?

Mike

Bruce · « **Reply #40 on:** August 22, 2004, 03:43:16 PM »

Quote

With VW transmissions there is a simple progression. The newer it is, the better.

Depends on the year of the trans. If you have a 61-63 trans, you throw the whole thing in the garbage. If you have a 73 or later, you do almost nothing.

Sparkmaster1 · « **Reply #41 on:** August 22, 2004, 06:49:21 PM »

Except in a later trans it's better to replace the fine toothed 3/4 with earlier model ones if you're planning on a higher HP output than stock motor. Tim

Matt · « **Reply #42 on:** August 23, 2004, 12:06:47 AM »

I've got a swing axle tranny in the garage right now. is there an easy way to find out what it is?

Bruce · « **Reply #43 on:** August 23, 2004, 03:11:48 AM »

The first thing to do is look at the numbers stamped on the lower right side ahead of the diff. Once you find the part number of the case, look down 1 1/2\", there's the trans #.
Then you can go by some features. Does it have long axles? Provision for a backup light switch? Much more than that requires a teardown.

Cameron · « **Reply #44 on:** September 16, 2004, 11:04:32 AM »

Bumpity bump bump...
Here's a picture of some super diffs. The left one is my old one (TIPH brand), where the spider shaft fell out (like Lanny's). The diff on the right is the new one from ERCO. Notice the orientation of the spiral lock pins. The old diff used 1/8\" spiral pins, the new diff uses 1/4\" spiral pins. You can see the mangled spider shaft hole on top of the old diff, I had to file off the rounded off edges, in order to get the ring gear off.

Sorry! I left this as a large photo, so you you can get more detail.

Hansk · « **Reply #45 on:** September 16, 2004, 06:32:20 PM »

Thanks for the update Cam . Is there some advantage to this new orientation or is it just a way of identifing the good diffs ? And which comes first , the pounded shaft bore or the broken and/or lost lock pin ?

Cameron · « **Reply #46 on:** September 16, 2004, 11:47:56 PM »

Quote

Quote
The bores for the pins pound out, allowing the pins to wiggle around, suspended only by the roll pin.

Hansk · « **Reply #47 on:** September 17, 2004, 03:51:10 PM »

Thanks Cam!

Author Topic: Catastrophic Failure.. (Read 4497 times)

Matt