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THE LOBBY A gathering place. Introductions, sports, showin' off your ride, birthday-anniversary-milestone, achievements, family oriented humor. |
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#1
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Rear end hunting
Just remember. If you can, pop the cover and inspect before purchasing. Bought a '74 Camaro rear end because it was a Posi and 3.42:1 gears. Oops.
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So long, farewell. |
#2
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Sometimes, it's not laziness but the fact the sellers know it's not and act dumb about. Rear-end Hunting sounds like a Popular Gaybar.
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#3
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Or sitting on the beach with dark sun glasses on.
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'68 GTO '69 Corvette '75 Cadillac Coupe Deville TOM |
#4
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Wow that was a crazy deal . 2.41 vs 3.42
Another fallback is the trusty old spin a lug stud 1 revolution and count pinion revolutions. |
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#5
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You did the math wrong. The case is still the 410408, 3 series. 41 divided by 11 equals 3.73:1.
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So long, farewell. |
#6
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As far as a crazy deal. Lot of performarnance coded & single track coded diffs out there with later installed gearsets. Posi units added, posi units robbed. On the down side, might also find a posi unit with spalled side gears & spider gears. Over the years, so many guys have laid an old assembled rear on the ground next to their garage, barn, etc. Moisture then condenses into the rear, & there will be a heavy rust line on numerous teeth of the ring gear & at East one or two teeth on the pinion. After a while, some very deep rust pocks in those areas. Smart storage, huh? Will repeat. always, pull the rear cover & check. Might find something that's a PLUS instead of a deal breaker.
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Buzzards gotta eat... same as worms. |
#7
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think I used 17 and 41 to get that. Would sure rather get stuck with a 373 than a 241 , not so bad at all. |
#8
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I had incorrectly assumed that you got burnt by not checking yourself, and were trying to help people from not getting burned themselves. I did go down the rabbit hole of trying to figure out the housing date code and gear code; Then tried to figure out what the stamping on the ring gear came out as - but I was unsure which numbers were the ones to use... The one that really stumped me was the "pumpkin" picture; What were you trying to show with that one? That's pretty awesome that you got a 3.73:1 posi - instead of being burned by something much less desirable.
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
#9
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Something Something about being sure to check first. Hope the 3.42 wasn't crucial to your plans.
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#10
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I can live with a 3.42 a lot better than a 3.73. I'd like to think both are more for 4 speeds (but I could live with a 3.42 and auto.) and would like to leave lower gears for the high winding engines. But now you have me thinking, what's the going price for a good posi rear end?
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So long, farewell. |
#11
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It was immediately obvious this thing had been in water for some time. The backing plates were rotten on the lower halves, and the sheet metal cover had a rust hole in it. I was treated like a jerk when I politely declined to buy it. |
#12
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At first I thought you were replying to oPh. So, I'm one to assume things are correct when purchasing things in a hurry. I found the assembly date/code first. CM (3.42:1 limited slip) G (Buffalo plant) 205 (I think is July 24) 2 (2nd shift) G (I think this one is for the limited slip or I've got the 2 G's reversed). I didn't check the webbing to see if it's '73 or '74 casting. Then on to opening up. A quick look confirmed it was a limited slip unit (410408, with 8's around which I don't know when they came that way). I really didn't start looking at it until I got it home and dumped enough lube to look at the stamped numbers and do the math. Of course the 3/'80 was a major clue too.
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So long, farewell. |
#13
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sorry, i can now see how that was taken… I’d edit that… but… lol
I had guessed that the “3_80” was a date, but wasn’t sure; Thank you for explaining the “pumpkin” picture. I have a 3-series ‘pumpkin’ I pulled from a ‘76 TA the better part of thirty years ago in a smaller plastic container… the only issue with it is (I believe) a cosmetic one; the pin back out (probably assembled with the lock not installed… I should share a picture some time…
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
#14
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Years ago I bought a rear end the owner claimed was out of a 1970 GTO Ram III car. The owner claimed it was a 3.55 limited slip, and it had the "N" cast into the top of the pumpkin. I didn't have my axle codes handy, so we pulled the rear cover. The gear set was 10 39. The guy took out a car key and started doing math in the dirt, dividing 39 into 10. He came up with a 2.56. I told him I didn't think he did the math correctly, and he got ticked off and said he could do simple division. So at the risk of making him mad, I didn't argue with him. I got a smoking deal on a 3.90 limited slip. 10 divided by 39 is .256, not 2.56.
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#15
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"Rear end hunting" was the alternate title for my college years.
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Clutch Guys Matter _______________________________________ 53 Studebaker, 400P/th400/9" 64 F-85 72 4-4-2 Mondello's VO Twister II 84 Hurst/Olds #2449 87 Cutlass Salon 54 Olds 88 sedan |
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#16
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jinkies anon...funny story mike
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Esquire '74 T/A 455 Y-code SD clone previously on Dawson's Creek: '74 T/A 400 '81 AMC SX/4 '69 FB 350 |
#17
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Always been more of a " Hooter Man" but Rear Ends are nice too! ANYTHING in the "3's" would be considered satisfactory for a Low RPM engine. unless of course those driving don't have the stones for a bit of RPM cruising. 4:11-5:13 for something considered high winding, God Bless Bill https://www.jalopyjournal.com/forum/...closed.614419/
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#18
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Yes, finding something wasn't what you purchased is about having stones, not that you had based your build around a particular gear. Stones it is. As long as you also have the stones to drive your low rpm engine in the 2's.
I shipped a 3.42 rear around the world. It would not have been a good result if any other ratio was found inside, for what I was planning, nor could I sell it to someone with stones and start searching again. Video hits and marketing has seen what was previously a horrible rear end now become a good one and the easily influenced believe it. I think anyone who's a fan of rear ends is still on the fence with who they belong to, and own a full length mirror. Last edited by Trevor78; 06-16-2023 at 12:49 AM. |
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