G body 8.5 or ford 9 inch

79regaldriver

79regaldriver

Not-quite-so-new-guy
Jan 10, 2017
5
0
3
#1
Does anyone have a posi 8.5 or Ford 9 inch for a 84 Monte Carlo ss for sale
 
MrSony

MrSony

Comic Book Super Hero
Nov 15, 2014
3,856
1,464
113
Des Moines, Iowa
#2
8.5s are pretty rare and expensive for what they are. 9 inches are available new, drum or disc, any gear you could want.
 
455'ed80Regal

455'ed80Regal

Master Mechanic
Supporting Member
Nov 3, 2010
374
43
28
Lincoln, MO
#3
Or you could locate a 66-72 A-body rear.
8.2 used from 66-71
8.5 used late 71-72
12 bolt used 66-72
 
TURNA

TURNA

Comic Book Super Hero
Jul 24, 2009
4,635
2,688
113
Socialist NY
#5
For the money buy the best a 9 inch and never worry about it again!!!!
 
Bar50

Bar50

Royal Smart Person
Jan 1, 2009
1,142
485
83
Tulsa, OK
#6
9 inch in my car. Would and will do it again.
 
pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
23,171
4,051
113
Kitchener, Ontario
#7
Or you could locate a 66-72 A-body rear.
8.2 used from 66-71
8.5 used late 71-72
12 bolt used 66-72
A body rear is from 64 to 72, the 8.5 and 8.2 64 to 67 is 2.5" wider than the G body rear and 68 to 72 is 4.5" wider
 
Anubis

Anubis

Royal Smart Person
Mar 30, 2012
1,446
336
83
#8
If you're making under 800 hp then the 8.5" is still the best option. It is designed for the G body and still cheaper than a 9". Add it all up and 9" rears cost a lot more than you think.
 
565bbchevy

565bbchevy

Geezer
Aug 8, 2011
5,436
2,154
113
Michigan
#9
The problem with the 8.5 is availability, they are becoming rarer everyday but sellers have known this for quite a while and have priced accordingly so if you plan on upgrading it with better carrier, gear and axles then you basically are buying an expensive housing where a bolt in 9" housing with upgraded axles and a few options sell for well under a grand.
Plus the 9" has the added bonus of a drop out 3rd member and the fact that the 9" has a very high level of aftermarket support.
 
TURNA

TURNA

Comic Book Super Hero
Jul 24, 2009
4,635
2,688
113
Socialist NY
#10
Not to mention just about every 8.5 for sale has been beat to pOOp!!!!!!!
 
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