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 Post subject:
PostPosted: Fri Mar 01, 2013 9:55 am 
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Joined: Wed Jul 23, 2008 2:38 pm
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Location: rhode island
Sounds like a Cat breed. :lol:


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PostPosted: Fri Mar 01, 2013 3:45 pm 
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Joined: Wed Feb 29, 2012 11:44 am
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Location: New Haven, CT
Image

Got the good stuff.

Frank, yes I have heard of that persian blue. I think nowadays people use some kind of yellow as well. One guide I read called for a TiO2 oil based paint (white).

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Justin
1986 Z31 NA 2+0


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 Post subject: diff.
PostPosted: Fri Mar 01, 2013 10:30 pm 
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Joined: Fri Sep 23, 2011 2:10 pm
Posts: 380
Location: Tolland, CT
This a subject I'm also going to need some help with. I have'nt yet
delved into this part of the drive trane, but I did build my new 355 a bit
on the cautious side to start, until I can feel out the handling and determine what I need to do with the diff. I'll be using my current Edelbrock 650cfm
carb. and if the new block hugger ceramic coated headers fit without interference from the steering, I should be in the 320 hp/360tq area. I'm
hoping the 5spd. tremek/custom drive shaft I put in to match the current diff.
will not have to be messed with. Gearing is right where I want it now. I guessed it was a 3.7 so I set the tranny up for a .62 5th which give me good
hwy rpm.
How can I determine which diff. is on the car (r200, etc.) being an early 260,
albeit a modified one. Don't know if original was changed. Anything on the case that will identify it?
Jack

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John D .... original 240 past, 260v8Roadster current


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 Post subject:
PostPosted: Fri Mar 01, 2013 10:43 pm 
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Location: New Haven, CT
Hi John,

My r200 case has stampings for the part number (the pumpkin part number at least).

"38311
P9000"

Image

I think this is stamped on all R200's but I am not sure... maybe someone can chime in and confirm (I have seen this stamping on a few R200's from various Z31 cars though).

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Justin
1986 Z31 NA 2+0


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 Post subject:
PostPosted: Fri Mar 01, 2013 11:02 pm 
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Joined: Fri Sep 23, 2011 2:10 pm
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Location: Tolland, CT
is that up when mounted so you can only see it if it's off?
I don't remember seeing anything on mine, but I only remember trying
to see if you could tell if ratio was indicated. Not. I think I would have noticed such large markings.
Jack

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John D .... original 240 past, 260v8Roadster current


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 Post subject:
PostPosted: Fri Mar 01, 2013 11:11 pm 
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Location: New Haven, CT
Yea, that's stamped on the top side.

I don't remember any markings on the bottom. Maybe you can fit your hand up and feel for the stamping?

For me the ratio was stamped on the actual ring gear itself (inside the diff).

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Justin
1986 Z31 NA 2+0


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 Post subject:
PostPosted: Sun Mar 03, 2013 7:12 pm 
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I got the old diff out without getting smushed!

Image

Image

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Justin
1986 Z31 NA 2+0


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 Post subject:
PostPosted: Sun Mar 03, 2013 9:37 pm 
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Location: Tolland, CT
Wow, that's tight. How'd you ever get in under there? Sorry to say my politically incorrect girth would require considerable more clearance.
Jack

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John D .... original 240 past, 260v8Roadster current


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 Post subject:
PostPosted: Sun Mar 03, 2013 10:24 pm 
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Joined: Wed Apr 09, 2008 5:53 pm
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Location: CT
With credit to Classic Z Car Club, here's a pretty good thread about the difference btwn the 180 and the 200, with some useable photos:

http://www.classiczcars.com/forums/engi ... umber.html


Frank T

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1970 240Z


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 Post subject:
PostPosted: Tue Mar 05, 2013 1:28 am 
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It was a bit tight, but I can squeeze under without problems. I thought it'd be advantageous to have the diff closer to the ground when removing it.

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Justin
1986 Z31 NA 2+0


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 Post subject:
PostPosted: Tue Mar 05, 2013 6:36 am 
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Might be worthy of mention to all the viewers in TV land that Justin weighs about 100 lbs soaking wet with his pockets filled with quarters. He could proably fit under there without jacking the car up. :wink:


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 Post subject:
PostPosted: Tue Mar 05, 2013 9:59 am 
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Location: CT
:lol:

Which gives him even more credit for being able to bench-press that heavy differential alone, without getting smushed!

You consider a 60lb steel diff free-falling from a height of 3ft, with nothing but your chest btwn it and the floor, and you start to get safety ideas.

I helped Bryan Little reinstall some heavy parts when he hooked up his gearbox and differential last winter. He doesn't rush ~ he takes his time, examines the job from a lot of angles and decides on the SAFEST method to get it done. In this case he decided the safest way was to have another pair of hands under there "just in case". He's strong enough to do it himself, but smart enough not to take the chance of something going wrong.

I also liked that he had a wireless phone laying under the car, within reach......again, 'just in case'.

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1970 240Z


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 Post subject:
PostPosted: Tue Mar 05, 2013 3:17 pm 
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:lol: I weigh a bit more than that!

I did have a cellphone on standby, and also let a few people know where I was and when I was going to be pulling the diff. Didn't have an extra set of hands though...

I think the younger crowd would describe this with something like "YOLO". :P

Side note: I need to invest in a 1/2" breaker bar. One of the screws holding my 1/2" ratchet together disappeared and now the ratcheting mechanism slips under a lot of force. I replaced it with some hardware at my lab (and used some loctite so it won't fall out). Maybe I'm abusing it too much... :roll:


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Justin
1986 Z31 NA 2+0
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 Post subject:
PostPosted: Tue Mar 05, 2013 5:52 pm 
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Location: CT
Well, ratchets are not intended to be used as breaker bars, anyway!
There are limits on everything, and I've destroyed more ratchets by over-torquing them than most idiots have. :oops:

My shop teacher once saw a kid using a pipe as a "torque multiplier" on the handle of a ratchet and made an embarrassing example of him. Even at that young age, the lesson stuck with the rest of us. :roll:

Breaker bars are for breaking. Ratchets are for ratcheting. Neither can do the other's job.

And yes, You Only Live Once, but why make it briefer than necessary?

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1970 240Z


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 Post subject:
PostPosted: Tue Mar 05, 2013 6:12 pm 
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Frank T wrote:
My shop teacher once saw a kid using a pipe as a "torque multiplier" on the handle of a ratchet and made an embarrassing example of him. Even at that young age, the lesson stuck with the rest of us. :roll:


Yes... I can almost hear my dad's voice whenever I do that... :)

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Justin
1986 Z31 NA 2+0


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