Joined: Sat Dec 10 2005, 04:28PM
Location: United States
Posts: 4954
I just found a 69 Plymouth 8 3/4 rear Posi for real cheap. My 71 Fury has an 8 1/4. Anybody know if that would be a direct bolt in? Or am I going to have to monkey with the spring pads? My Holanders say they are different, but they have been known to be wrong before. . . Maybe it's the ring size that is making them do that.
Coming out of a running car that is rusting around the engine and trans. It's a 318 car so the ratio ought to be right on <span class='smallblacktext'>[ Edited ]</span>
Joined: Fri Oct 07 2005, 12:03PM
Location: Central Ky.
Posts: 1575
I'm like you....I think they're the same pads. I don't think they went to any Iso-stuff till later. I know the b-bodies did in 73' but I don't know about the C-'s.
I know 69 & 70 had the standard pads like all A-B- E's. Does your 71'? I would think so.
Only other thing would be width between them but I can't see it being different since 69-71 for sure are pretty much the same. You could always do a measurement just to be safe.
Okay....I just looked at the tech archives on Moparts & got this.... 65-69 C-body backing plate flange toFlange =61.75" 70-71 Fury /chrysler Flange to flange = 63.00"
Little over 1/2" more per side if that's correct, I think it would fit still. no measure ments for perch to perch given. I'm Stupid! the 69 is 1/2 narrower per side than the 71. Thinking backwards LOL. Have to see how much room ya got to move & not rub tires on the springs. I wouldn't think a 1/2" would hit since you appear to be running stock-sized tires.
Here's the kicker, Axle center line to Yoke center line 8 1/4 = 11.69......8 3/4 = 12.35
So the driveshaft would need to be shortened .66 going to an 8/34. unless there's enough play left to make sure the driveshaft won't bottom out with suspension travel. Don'task me how I know THAT one! Oh wait! you can use the driveshaft from he donor car too! as long as they're both 904's ( or 727's ) DUH!
I replaced the 7 1/4 in the old Aspen with a 8 1/4 & had to shorten the driveshaft 1 1/2" for that swap ( didn't get the driveshaft with the rear ). Just put that same F-body 8 1/4 in a 75 Duster for Nephew. They're about 3"wider & the perches are Iso-style on the F-body. that was fun! Cut the old perches & made new ones outta 2X2 box tubing, re-set the pinion angle to match the 7 1/4 & used 8 3/4 shock plates. You can do anything with a torch/welder & a angle finder. Did fill up the wheel-wells better LOL.
I say go do some real work measuring unless someone else comes up with anything else.
<span class='smallblacktext'>[ Edited Thu Dec 29 2005, 02:35PM ]</span>
Joined: Sat Dec 10 2005, 04:28PM
Location: United States
Posts: 4954
Ah Good info. Wish I had time to do that research. . .as it is I have to make an appointment to go to the CAN around here.
I have the Isolation pads. I had already thought about the drive shaft, they're both 4 doors. I can use the fury shaft in my 62 Dart Wagon. That will be getting a 727 on a 318 also. Already has an 8 3/4 in it. . .
Parts swapping. Like you Butch, I don't waste anything. But I do have to work at night.
Joined: Fri Oct 07 2005, 12:03PM
Location: Central Ky.
Posts: 1575
I do my best work at night! Wait...that came out wrong!
So the 71's have isolation pads on the rear? Didn't know that. No one around here has a 71 for me to look at. Just 69 & 70. No isolation, just the pads to spring, U-bolts & shock plate.
It's fun seeing what ya can get away with sometimes & still be safe, also outta necessity! His 7 1/4 blew up & the 8 1/4 was all I had & he needed it back, 25.00 worth of parts & some labor & he.s gone back to college!
Joined: Sat Dec 10 2005, 04:28PM
Location: United States
Posts: 4954
Well there you go.
When you said isolation, I thought you were talking about the axle to spring pads. That's what I have. . . What I don't get is where the 1" difference is in the back end. As far as I know, they were all the same, 69 to 71, except for cosmetic. But come to think of it, the 69 4DRHT has a lightly different roof line then the 70 and 71. I know, I tried to replcae the drip rail on my 71 with a 69. No go.
This is good this came up. Lots of good mind storage for those younger whipper snappers. By the way. . .anyone need a right dripo rail set for a 69 4 DR HT?
Joined: Fri Oct 07 2005, 12:03PM
Location: Central Ky.
Posts: 1575
So did I, till I looked it up! Of course that's why I saif IF the info is correct. I'm always a bit dubious about info on the net.
I was talking about the isolation under the spring pads ( if any ). The 69 & 70 don't have any....so the 71' does? Just to make sure we're both on the same page here!
This is making my brain hurt!
They had both rooflines in 70-71. Just depends on which model. My Fury is a Formal roof car ( like yours I think ) window curves inward. An SFGT would be the regular roofline, curves outward. The 70 Fury III is just parted was an "outie" too but it was a 4-door sedan. Yours is a 4-door HT right? Probaby has something to do with it, I never tried to match what roofline went to which carline in all cases, just know what a few are.
But then you said 69 4-dr HT was different than yours.....now I'm so confused LOL!
Joined: Sat Dec 10 2005, 04:28PM
Location: United States
Posts: 4954
Yeah you're right. Big rubber pads between the springs and the rear. The springs are in between the two of them. I don't want you to hurt yourself
As I understand it, the formal 4 DR HT is a rarer bird than the standard Hard top. The rear window is the same as the 2 Door Formal. A friend of mine said he owned one. He claimed he had done some research on them and found the 4 DR Formal was an odd ball. I've seen plenty of "innie" windows on the 2 doors, but not on the 4 doors. Most of the 71's I've seen are "Outies" [ in out in out MMMM]
But I have another question for you Butch, that has eluded me and my friend. I have to post a new thread for that though. . . <span class='smallblacktext'>[ Edited Thu Dec 29 2005, 09:09PM ]</span>
Joined: Sat Dec 10 2005, 04:28PM
Location: United States
Posts: 4954
For you more literets out there. . . .
OK Snotster. . . . Posi vs. Limited Slip. Posi is one 4 letter word. Limited Slip is 2 words, 11 letters. Basically for the purpose of this thread, SSDD
So there.
Aren't you supposed to be saving a soul or something? LOL
