Jack aus Maine möchte mit seiner 66er C2 Europa bereisen - Tipps?

[Jack Panzica]

Gary Ramadei is putting the final touches on the rear end he is building for me. He discovered excess run out in the posi unit. Here are his comments and process to reduce run out to his specs.

Hi Jack,
So as I mentioned yesterday there was a wide range of lash in the setup. I wanted to see if it was in the gears or the posi case. I removed the ring gear from the posi and checked the bare posi in the housing. I checked a few places; the posi flange where the RG mounts, the case OD where the RG ID is press fit, and the flange OD. I found the case OD was good with only 001" or less runout in it but the flange had 006" runout and the flange OD had 008". The flange OD doesn't matter but the case OD & face do. I set the posi up in the lathe using a small 4 jaw chuck to dial in case OD as my reference. I dialed the case OD to less then 001" and rechecked the flange run out in the lathe and it was out 006". I faced the flange 005 in small passes and turned the flange OD. In the lathe they were both 0 but I knew it would open up in the housing because it will be referenced off the case bearings.

"I found the caps were loose on the bearing races and set them up to 001" gap. Then I installed the bare case and found the flange runout 002 which is good. The case OD is still 001 and the Flange OD is under 001". I was able to keep the case bearings installed without issue. The lash is now within 002-003 compared to 006 before. I couldn't do a pattern test because I have to let the Loctite setup on the RG bolts again. Next up I will check the pattern to see how it looks. I did radius the edges of the teeth on the RG, this is an old blueprinting trick.

I will see how the pattern looks on Monday."


This video is an example of what he did to my unit. Just click on it

[url="https://www.youtube.com/watch?feature=player_detailpage&v=3rDWhaGtr3E"]1963 Chevrolet Biscayne Positraction Differential Overhaul - Part 3.1 - Repaired - YouTube[/url]


Pictures







On milling machine



Caps