BUILD THREAD Project Olds Cool (Recognition!!)

[Rktpwrd]

ummm its 15 deg and sunny in Calgary. My sister up by Signal Hill says the roads are clear and dry......

... burnout pics ?? Just to make sure the noise is gone of course. Purely scientific

Don’t you mean “somewhere in Mexico” it’s 15 deg and sunny, burnout pics, purely scientific??
😏

Honestly, it’s killing me. It’s absolutely gorgeous out today and I’m jonesing to take the car for a rip so badly. Problem is there’s a skating rink that’s passing for an alley behind the garage. If I took it out now, I’d never get it back in again until the ice melted entirely sometime in April or May.
😔

 

[69hurstolds]

Pssst. (Wife and I took the ZL1 convertible out with the top down for a 50 mile jaunt today. It was only about 26 deg C out... 79 deg F for those south of the Canada border)

Speaking of rubber while driving around, I turned a corner, then mashed the throttle a bit in 1st with the nannies off. Slipped a bit sideways when I shifted into second with the azz end drifting into the opposite lane a bit. The wife was pi$$ed I didn't warn her first and said I obviously didn't see that county cop across the road at the gas station or I wouldn't have done it. He must've been eating a donut or something.

 

[Supercharged111]

Summer tires are EVIL in the cold!

 

[JAMCAR223]

This is GREAT news D! You must be EXTREMELY relieved! Now you have just enough time to get that rear axle finished up, before the weather breaks.

 

[08Malibu]

Looks like I was right about no Juggernaut work over the winter. Glad you’re getting this one sorted out though.

 

[Northernregal]

Pssst. (Wife and I took the ZL1 convertible out with the top down for a 50 mile jaunt today. It was only about 26 deg C out... 79 deg F for those south of the Canada border)

Speaking of rubber while driving around, I turned a corner, then mashed the throttle a bit in 1st with the nannies off. Slipped a bit sideways when I shifted into second with the azz end drifting into the opposite lane a bit. The wife was pi$$ed I didn't warn her first and said I obviously didn't see that county cop across the road at the gas station or I wouldn't have done it. He must've been eating a donut or something.

I see you put the metric temperature first. The Queen will appreciate that.

 

[Rktpwrd]

This is GREAT news D! You must be EXTREMELY relieved! Now you have just enough time to get that rear axle finished up, before the weather breaks.

Most definitely James, extremely relieved to say the least!
You hit the nail on the head, Mike and I will be tearing into the rearend starting tomorrow. Hopefully it’ll be pretty straightforward and go fairly quickly. I’ve got that, and one other little project I’ve already started that I want to get done before the cruising season starts in earnest. I’ll be posting on both projects here shortly.

Looks like I was right about no Juggernaut work over the winter. Glad you’re getting this one sorted out though.

Unfortunately, yes, you were right. No Juggernaut work now until probably the fall. But I did come damn close a couple of times. Had to convince myself to stay the course and see Olds Cool through to the end before starting something new again though.

That being said, I’m super stoked to get rolling on it come September!

 

[69hurstolds]

Patience grasshopper. Jugg's time will come.

As for the rear end posi job you're about to undertake, IIRC you're using an 85 442 posi rear?

*cross shaft pinon backlash in the posi unit should be .001"-.006". Anything over .006" will need shimming of the side gears.

*Not sure if you're doing the pinion too, but new pinion bearings for bearing preload per the 1985 CSM is 20-25 inch-pounds. (used bearings is 10-15). Many places will tell you 14-19 inch-pounds for new bearings. Ring gear backlash is .005" - .009" for new gear set per CSM (it doesn't mention any used gears), although again, other places will tell you that .006"- .010" for any set is fine. You decide.

*Side bearing pre-load, from the CSM, says once you get pinion depth and backlash set right as per dial indicator and good pattern, remove gear side shim, then replace with a shim that's .004" thicker. Then do the same on the passenger side and tap it in for a total of .008" extra shimming for preload. Check backlash again and if it's out, get it right, and then button it up and call it a day.

*Plus, here's a spring tip... when banging out the "S" spring on the bench, place a couple of shop towels or equivalent over the carrier so when it does pop out, it doesn't fly out across the shop and hit something or someone you don't want it to hit.

 

[64nailhead]

*Side bearing pre-load, from the CSM, says once you get pinion depth and backlash set right as per dial indicator and good pattern, remove gear side shim, then replace with a shim that's .004" thicker. Then do the same on the passenger side and tap it in for a total of .008" extra shimming for preload. Check backlash again and if it's out, get it right, and then button it up and call it a day.

.001-.003" is all I've ever used. .008" is a ton - you'll definitely need a hammer to get those shim(s) installed.

I'm curious of the document that indicates that amount of preload?

 

[69hurstolds]

.001-.003" is all I've ever used. .008" is a ton - you'll definitely need a hammer to get those shim(s) installed.

I'm curious of the document that indicates that amount of preload?

The 1985 cutlass CSM. There’s some out there that says keep shimming the side bearings until you can’t fit any more in and that you can’t get too much preload on the side bearings.

personally I think you can just subtract the final pinion running torque from your total running torque (with the diff installed) and multiply that by the gear ratio. You would think new side bearings should have the same preload as the piñon bearings.

in any case you want the diff right enough not to be able to be yanked out of the housing by hand.