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Post by Slam_Shifter on Dec 1, 2005 23:20:03 GMT -5
Put all your 8 3/4 tips and what interchanges here.
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Post by dadicted on Dec 1, 2005 23:43:43 GMT -5
the best mopar rearend is the 8 3/4. i dont know what yrs cars came w/ them, but im pretty sure the imps, 60s newports, newyorkers had them.
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Post by chryslerfat on Dec 2, 2005 8:57:53 GMT -5
Dont run the early rear with the keyway hubs if you have any power they will shear.
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Post by Shorty Thompson on Dec 2, 2005 19:11:29 GMT -5
Ok,,,there are 3 types of 8 3/4 diffy center sections . The 741,742,488/489 . Now then the 741 has a 1 3/8" pinion shaft . The 742 has an 1 3/4" pinion shaft. The 488/489 has a 1 7/8" . These different pinion sizes are not interchangible . The cases are . They all have a 30 spline axle . The drag racers like the 488/489 cases for their strength . However in our circumstance the 742 best suits us . Gear selection is good for the 742 or the 488/489 . The 488/489 gears are higher price though . All 8 3/4 center sections are interchangible too. Even with the keyed hub version .
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Post by dadicted on Dec 2, 2005 20:27:30 GMT -5
i was just waiting for u to show up and say something shorty. lol.
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Post by Shorty Thompson on Dec 3, 2005 11:45:24 GMT -5
;D . Somehow I knew that .
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Post by dadicted on Dec 3, 2005 11:54:22 GMT -5
when it comes to specific types of parts of cars or engions ur the one i expect to correct everyone. lol.
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Post by Shorty Thompson on Dec 3, 2005 11:57:53 GMT -5
Btw , since we're on the subject . Alot of people think that 1 either just throw the gears in and run them and it's fine . Well it isn't .
The other thing is that people think they have to have it professionally installed too. You don't .
I do all my gear installations . I do it by feel too . I know what I want to achieve . and that's what I set my backlash at .
Now then . No matter what rearend you have , everyone has to be "preloaded" . If you don't preload then chances are you'll mess up a good set of gears . Also you'll split your case too.
Pay attention to what gears you get too ! Most of the time alot of gears will interchange, if, you use them in a same type case they came out of . For example : if you grab a set of gears off ebay . The seller tells you that they are out of a bolt in axle type case . Now they will fit into a "C" clip rearend , but not correctly . If they are intended for bolt in axle diffy then stay with that .
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dm440c
Rat
build it to break it
Posts: 7
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Post by dm440c on Dec 4, 2005 21:45:14 GMT -5
Clutch type SG below:  Cone type SG below:  open diff below:  |
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Post by dadicted on Dec 4, 2005 21:59:03 GMT -5
man this is great thats some good pics.
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Post by Slam_Shifter on Dec 6, 2005 18:53:46 GMT -5
You have any pics that clear of one with a spool or that has the lincoln locker option? Would be great to show what should be welded and what the difference between a spool and a stock posi unit are. Thanks. BTW good work guys. This thread is staying on topic and the information so far is all usable stuff.
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Post by Shorty Thompson on Dec 8, 2005 4:58:30 GMT -5
This is a 741 with a full spool . It's not mine , I stole/borrowed the pic:  |
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Post by gmwagonman on Dec 8, 2005 9:06:12 GMT -5
Shorty-
You are the MAN!
Which of these 8 3/4 rear end types are you trying to set me up with?
What do you guys think about a Pacer with 8 3/4 rear and 4.89 gears?
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Post by Shorty Thompson on Dec 8, 2005 19:01:22 GMT -5
 Samething Arnie , but the difference is mine is a 489 case , 8 3/4 . Btw , just happens to be the strongest offered by mopar.
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Post by rrone on Dec 8, 2005 19:04:17 GMT -5
hey shorty--- the gear on the spool, is it a 4.88 or 5.13? trying to name that gear ratio lol.
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Post by Shorty Thompson on Dec 8, 2005 19:05:34 GMT -5
Mine ? neither , it's a 4:86 .
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Post by rrone on Dec 8, 2005 22:54:34 GMT -5
close enough--- i wasnt thinking mopar with the anwser lol.
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Post by Shorty Thompson on Dec 9, 2005 4:51:47 GMT -5
But if your asking about the gear in the pic , I'd guess a 5:38.
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Post by rrone on Dec 9, 2005 17:59:45 GMT -5
yeah iwas trying to name the gear by looking at ring gear width and what i could see of the pinion.
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Post by Shorty Thompson on Feb 5, 2006 16:45:16 GMT -5
Btw , rick , this might help both of us figure out what gear it is . I turned it side ways , lol.  Now then with that said , I have to say that this was taken from ebay . This was setup that I was bidding on . I just wanted the spool on this diffy , nothing more . I also know this . The size of that gear is does not fit that case . I also know that 741 cases won't support that thick of the gear . |
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Post by idahoimpkiller on Mar 1, 2006 21:43:14 GMT -5
Shorty, I have a 8 3/4 rear out of a 73 imp that turned both tires when I hammered it down... no doubt about it, it was a two wheel peel... I pulled out the 3rd member to night and it looks like and Open Diff... whats the deal? what would make it spin two wheels? I kinda need to find out I have a buyer and I don't want to sell him a S.G if it is not what it is...
Jake
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Post by Shorty Thompson on Mar 2, 2006 4:50:09 GMT -5
Jake , I looked at the link you got on the IDDA . That's definately an open diffy . It's simular to the 1 that I had . I always called it a power lock, it's really an open diffy, it's no sure grip , and he's not going to be hurt by it .
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Post by idahoimpkiller on Mar 2, 2006 9:07:17 GMT -5
what is a power lock? and what do you mean by he's not going to be hurt by it? the guy wants to put it in a Road Runner and he wanted to make sure it was 3.91 gears any less then he didn't want it.... How should I explain it to him?
Jake
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Post by Shorty Thompson on Mar 2, 2006 21:32:24 GMT -5
then tell him the truth ! Tell him it an open diffy , that's limited slip . I had 1 in a 67 Fury III . That thing would lay dual marks at anytime I wanted . And as for the gear , hey ho , it's all good too .
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Post by stris141 on Mar 3, 2006 13:53:51 GMT -5
Jake, I'm not real good at this gear stuff. But I believe, a power-lock, is a special set-up, that when you put the hammer down, it spins the rear, and a pin comes out to engage both axels. Or, it's one where you flip a switch, and a soenoid engages a pin, for both axels.
Steve
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Post by Shorty Thompson on Mar 3, 2006 21:16:29 GMT -5
maybe in certain circumstances , but not in this . I , myself ,had 1 of these , it did the samething .
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Post by dadicted on Mar 4, 2006 11:26:53 GMT -5
i was told once that almost all mopar rearends are c-clip. is that true or is this guy just a anti mopar guy to the bones.
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Post by Shorty Thompson on Mar 4, 2006 18:49:38 GMT -5
No they aren't matt . The 8 3/4 is a bolt in axle , and If I can get slam to post it the 71/4 is a bolt in axle . Otherwise all the others are that I know of .
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Post by dadicted on Mar 4, 2006 20:39:24 GMT -5
thanks shorty, i was hopping that they wernt. maybe he said that they break easy. is that possible?
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Post by Shorty Thompson on Mar 5, 2006 9:19:39 GMT -5
What,,,,,,? the 8 3/4 ? Well you can break any diffy . It's just that some break easier that others . Take a "C" clip for example . One good shot to the wheel and you pop the button off on it , then your axle just rolls on out . B I A 's won't . Now then they are better axle grades too as far as the bolt in 8 3/4 axles goes as well . For example the 5 on 5 imp diffy is a better axle thatn the New Yorker stock axle . However ,,,,,,before you go looking into swapping out axles you need to look/check the lengths first .
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Samething Arnie , but the difference is mine is a 489 case , 8 3/4 . Btw , just happens to be the strongest offered by mopar.