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what is it??
https://slantsix.org/forum/viewtopic.php?t=28053		 Page 1 of 2
Author:  bringtheboom [ Tue Mar 25, 2008 1:33 pm ]
Post subject:  what is it??
i have a 73 valient. 225 auto. the rear end has obviously been swaped, because the bolt pattern is 5x4.5" whereas the front pattern is 5x4. what rearend is in my car??
Author:  Joshie225 [ Tue Mar 25, 2008 1:51 pm ]
Post subject: 
Don't know, but most likely it's a newer 7 1/4. How many cover bolts and what's the diameter of the axle tubes?
Author:  bringtheboom [ Wed Mar 26, 2008 9:16 am ]
Post subject: 
10 bolts
Author:  Joshie225 [ Wed Mar 26, 2008 10:11 am ]
Post subject: 
Image
Author:  bringtheboom [ Wed Mar 26, 2008 11:51 am ]
Post subject: 
looks like i got an 8 1/4. worth upgrading to lower gears/ltd slip?
Author:  Joshie225 [ Wed Mar 26, 2008 12:42 pm ]
Post subject: 
The best gears depend on a lot of factors not related to the rear end itself. For instance a numerically higher gear is typically used with a 170 than a 225, or with a manual trans rather than an automatic. Limited slip differentials are easy to come by for the 8 1/4.
Author:  bringtheboom [ Thu Mar 27, 2008 9:15 am ]
Post subject: 
what vehicles would typically have an 8 1/4 with a ltd slip and gears in the 3:73-4:10 range. and yes i do want gears that low. i dont drive on the highway. also, are all 8.25 rears 27 spline? and are they all c clip style?
Author:  Joshie225 [ Thu Mar 27, 2008 9:52 am ]
Post subject: 
Dakota pickups frequently come with 3.55s and some with 3.90s. All '96 and older 8 1/4s are 27 spline and all are C-clip. '97 and newer is 29 spline.
Author:  volaredon [ Thu Mar 27, 2008 6:05 pm ]
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Not all 7-1/4s had 9 bolts. Some I have had with 10 but a slightly different cover. I had one oddball 7-1/4 that had 2-1/2" tubes out of the housing flared to 3" a few inches out from the pumpkin. I got it because it was supposed to be an 8-1/4 but was not; the guy just assumed that because it was a "10 bolt" it was an 8-1/4. I do not have it in front of me as we speak, but I do remember looking thru my '80 factory parts catalog and ther was an up to/after date associated with the 7-1/4 that year; IIRC it was something like3/1/80; cover was different P/n, housing was different p/n; could this have been when the7-1/4 went from the 8-3/4 type of axle bearing to a C clip? I believe that everything but gear packages and carrier were different between them.
Oh and Dakota rear ends? They were availble with 7-1/4 at least thru/including '90. (that was what used to be in my '90) I put an 8-1/4 in there when the side gears cracked and cracked the carrier housing. 87-90 had 5 on 4-1/2; 91-up had 6 lug. Somewhere after 90 they switched yokes to accept a larger U joint. When I did the rear end swap, the truck I got the 8-1/4 out of, had been in an accident, the housing was actually bent! That was the only Dakota he had in at the time so i wound up getting another rear end from another yard. This one was out of like a 94 and I wound up using the axles out of the bent '90 housing and the yoke too, and slapped the 6 lug axles and '94 yoke on the bent '90 housing when I took it back for a refund which I OK'd with the initial JY owner before I "built my own" between the 2 rears to get the truck back running again. that was after my anti-maintenance, run-it-in-the-ground brother in law wound up with the truck.... nother story
Author:  Wesola78 [ Sat Mar 29, 2008 8:20 pm ]
Post subject: 
"I had one oddball 7-1/4 that had 2-1/2" tubes out of the housing flared to 3" a few inches out from the pumpkin. I got it because it was supposed to be an 8-1/4 but was not; the guy just assumed that because it was a "10 bolt" it was an 8-1/4." by VolareDon

Yeah, that's the 7 1/4 diff that looks like an 8 1/4. I've seen those in a lot of Diplomats, Gran Furies, 5th Avenues, etc.

The 8 1/4 differential in my '78 Volare came from an '82 Diplomat cop car.
Author:  onelightracer [ Tue Apr 01, 2008 10:52 am ]
Post subject:  7-1/4 rear
I have a 1966 Belv.II slant 6-3 speed column shift came from the factory with a 3.55-1,7-1/4 With 4-1/2 bolt patern Should be a good swap into a late dart or duster?
Author:  bringtheboom [ Tue Apr 01, 2008 12:11 pm ]
Post subject: 
i want to change the bolt pattern on the rear end to the small pattern. whats the best way to do this myself. i was thinking if i got a small pattern drum, i could take the axle out, knock out the studs, then put the drum on the axle, center punch the stud holes. then drill away. any thoughts??
Author:  slantvaliant [ Tue Apr 01, 2008 2:10 pm ]
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I'd sure think about swapping in front disks with the 4.5" bolt pattern, instead of trying to change the rear to 5-on-4".
Author:  bringtheboom [ Tue Apr 01, 2008 2:16 pm ]
Post subject: 
but i already have the wheels 14x7 mags in 5x4" and i dont want to invest a lot of money into this car. for disc swap id need spindles/rotors/mastercylinder and mabye more stuff.
to get my wheels to fit i just need to figure out how to accuratly drill the stud holes.
Author:  volaredon [ Tue Apr 01, 2008 3:15 pm ]
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bring the boom; Sell or trade the wheels for 5 on 4-1/2s, you will have less trouble finding a replacement should you accidentally damage a rim! As 5 on 4 ismuch less common you MIGHT just find, that you come out a bit ahead on the deal as more common uaually=cheaper to buy in the same style of rim.

onelight; a 7-1/4 in a Belvedere? I never knew that B bodies got that weakling rear end. Unless its a Sure grip version I wouldn't run it; Now if it was an 8-3/4? '66-70 B bodies are the ones that F body (aspen/Volare) guys are after to do their rear axle swaps. I believe it would be too wide for an A body though, w/o the "stinkbug" look of the rear wheels sticking out too far. The only way around that would be non-stock, offset wheels.
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