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914World.com _ 914World Garage _ Transmissio notes, 31 pages of DVD supplementation

Posted by: Dr Evil Jun 6 2015, 07:01 AM

This was posted a long time ago but stopped working after some changes were made when we suffered the DDOS attack (from what I understand). So, after seeing another post on how to post a PDF, and seeing someone doing it, I figured I could do the same. This helps a lot as I have to have people contact me directly for a copy and it is a PITA for both of us.

So, what is it? It is a copy of my experiences and musings over several transmission related questions that I wrote up a long time ago. Oil questions, LSD/TB diff, shifter and clutch adjustments, probably other stuff. I havent updated it in a while. If you guys see stuff you want to discuss, or things you would like to see addressed, post up and I will try to get on it to further refine things. I will likely post up things that I see, when I do builds, in this tread to keep things more centralized. I have some good pics recently and some very good warnings to go along with them so stand by.

Enjoy!

Attached File(s)
Trans_vid_sup_COMPLT.pdf ( 199.18k ) Number of downloads: 3033

Posted by: arkitect Jun 6 2015, 08:16 AM

Mike,
Thanks for posting this, page 7 is what I need to do, the change from a tail shifter to side.

I saved and changed the name of the pdf to add 'Dr Evil' to the end.

Dave

Posted by: altitude411 Jun 7 2015, 09:33 AM

When I open this PDF I get the Hemmings creamsicle article???

Posted by: Dr Evil Jun 7 2015, 01:40 PM

Our first lesson comes from a transmission that was being driving hard at DE/AX type of events, but the owner thought it a better idea to use 85w140 rather than 80w90. All other parameters of the oil were correct. What you will see is damage due to wear from poor lubrication.

This is the input shaft bearing at the intermediate plate. The inner race (towards the diff) always wears worse than the outer. As you can see, there is a ridiculous amount of wear. The edge of the race can cut your finger. The balls have much missing material.

You can see the race on the inner face of the intermediate plate, broken and moments from detonation.
Attached Image

Here are the spacers that are between some of the gears. They are burnt. They are essentially free floating in that they do not index to the shaft, but the are pinched in place by the gears.

Now this was a weird finding. The dog teeth were separating from the gears. I can only imagine that it was due to heat, but it could have been due to prior assembly. Not sure. These are two different gears.

Attached Image

Hard to photo, but there was some wear on the pinion teeth that rendered it unserviceable. Areas of rough metal like it was sanded.

My assumption is that the 140 oil was too thick and did not circulate well. It may not have hit the temp that it needed to reach the lower 85 viscosity. This is the only theory that I feel explains this damage. I have never serviced a box that used this oil so that also makes me blame the oil.

Use only 80w90 GL5!

Posted by: Dr Evil Jun 7 2015, 03:00 PM

PDF works for me on multie devices. Dunno what to tell you. You or anyone else can contact me any time for a copy.