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question on rear swap on my 69 Dart #972815 04/13/11 08:21 PM 04/13/11 08:21 PM
Joined: Apr 2003 Posts: 529 MD 7 75dusted OP mopar
75dusted OP mopar 7 Joined: Apr 2003 Posts: 529 MD	I have a 69 Dodge Dart GT with a 7 1/4 rear and I am going to switch out rear to a 8 3/4 rear A-Body, but it has the small 4" bolt pattern what do I have to do to switch it out for a 4 1/2" bolt pattern and is it a easy swap

Re: question on rear swap on my 69 Dart [Re: 75dusted] #972816 04/13/11 09:06 PM 04/13/11 09:06 PM
Joined: Feb 2010 Posts: 18,493 Granite Bay CA Kern Dog Striving for excellence
Kern Dog Striving for excellence Joined: Feb 2010 Posts: 18,493 Granite Bay CA	If you don't have the 8 3/4 yet, look for one from a 65-67 B body. They will have the big bolt pattern and even though the axle will be wider, you may be buying new wheels anyway. I have a 66 Coronet axle in my 67 Dart. Standard 15x6 wheels clear fine. I have 235 60 tires too. Your other options include buying NEW axles with new bearings. Prices vary, but they are usually over $250.

Re: question on rear swap on my 69 Dart [Re: Kern Dog] #972817 04/13/11 09:48 PM 04/13/11 09:48 PM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	you have to have the drums and axle re-drilled from 4" to 4.5" wbp or use an early B-body 8 3/4 housing or like I did,set of moser A-body spec axles with the large brake offset,green bearings(or a stock bearing) they will make the whole A-body 8 3/4 rear axle a 1/2" wider(1/4" each side) I ran a 7" rim with a 4.5 backset with a 245/60/15 on my 68Dart fit was perfect in the fender wells FYI,I took the same A-body 8 3/4 axle and bolted it in the 88 440 truck I built to run 12" wide rims and a 29x15x15 M/T..used the same 4.5 backset tucked them right in A-body and trucks share the same 43" spring centers and dont forget to put some lipstick on the 8 3/4 when it goes in the A-body 6583869-smilyface.jpg (33 downloads) Last edited by scratchnfotraction; 04/14/11 11:15 AM.

Re: question on rear swap on my 69 Dart [Re: 75dusted] #972818 04/13/11 10:50 PM 04/13/11 10:50 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: what do I have to do to switch it out for a 4 1/2" bolt pattern and is it a easy swap As said go w the 65-67 B & deal w the wheel offset and the pad perch C to C diff or get a 1/2 Ton truck 8&3/4 & weld some new perches on the bottom side which'll let you set the pinion angle dead on w your cars' rake/springs. W you having a SBP 8&3/4 already you can redrill/tap the flange for 4&1/2" and use THREADED not press in studs (1/2-20). Moroso has them. Can have Moser in portland Indiana shorten a set of 1/2ton truck or C body or b or e (one of the two "b or e" I forget which) axles & use std 70's BBP 10" drum brakes from an 8&1/4 or 8&3/4 or 11" drum setup which'll require 15" wheels live every 24 hour block of time like it's your last day on earth

Re: question on rear swap on my 69 Dart [Re: scratchnfotraction] #972819 04/13/11 10:50 PM 04/13/11 10:50 PM
Joined: Apr 2003 Posts: 529 MD 7 75dusted OP mopar
75dusted OP mopar 7 Joined: Apr 2003 Posts: 529 MD	I want to have the springs moved inward with the relocation kit, so I can put 275/60-15 tires on the rear, so I was just wondering whats the best way to accomplish this

Re: question on rear swap on my 69 Dart [Re: 75dusted] #972820 04/13/11 11:08 PM 04/13/11 11:08 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	As you know w that you'll be relocating the perches either way so it'd come down to modding the ends of your current SBP 8&3/4 for BBP or diff axles or grabbing a complete BBP 8&3/4 rear. Do you have your wheels picked out & know the backspace on them? EDIT W your SBP 8&3/4 did you get shock plates/ubolts/nuts w it as they're diff from the 7&1/4 ones Last edited by RapidRobert; 04/13/11 11:55 PM. live every 24 hour block of time like it's your last day on earth

Re: question on rear swap on my 69 Dart [Re: RapidRobert] #972821 04/14/11 08:30 AM 04/14/11 08:30 AM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	move the spring mounts into the frame rails/move perches on the axle pop in a set of BBP axles with greens and your done just spec the A-body axles with the large brake offset and the 4.5 BBP use any brake set up off b-c-d-e-f-m-r body 8 1/4-9 1/4-8 3/4 then pic your rim with correct backset IIRC you may have to mini tub it for that tire wheel combo

Re: question on rear swap on my 69 Dart [Re: RapidRobert] #972822 04/14/11 09:53 AM 04/14/11 09:53 AM
Joined: Jan 2003 Posts: 74,948 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,948 U.S.S.A.	Quote: Quote: what do I have to do to switch it out for a 4 1/2" bolt pattern and is it a easy swap As said go w the 65-67 B & deal w the wheel offset and the pad perch C to C diff or get a 1/2 Ton truck 8&3/4 & weld some new perches on the bottom side which'll let you set the pinion angle dead on w your cars' rake/springs. W you having a SBP 8&3/4 already you can redrill/tap the flange for 4&1/2" and use THREADED not press in studs (1/2-20). Moroso has them. Can have Moser in portland Indiana shorten a set of 1/2ton truck or C body or b or e (one of the two "b or e" I forget which) axles & use std 70's BBP 10" drum brakes from an 8&1/4 or 8&3/4 or 11" drum setup which'll require 15" wheels Not only have you given incorrect info about big blocks, now you are giving incorrect info on brake size/wheel combos and the axles that can be shortened. First, 11" drums REQUIRE 15" wheels ??? That's funny hundreds of thousands of B bodies with 11" drums came standard with 14" wheels, in fact anything that didn't have a Hemi up to the beginning of the 70 model year ONLY came equipped 14" wheels. Next, axles that can be shortened , there aren't any B or E body axles I have ever seen or seen written about in tech articles that can be shortened and resplined for use in an A body, only SOME C body axles and possibly older pickup axles might be able to usourced for this . 75dusted , do you already have an A body 8.75? Have you already swapped the front over to the big bolt pattern, there is a lot of ASSuMEing in this thread. edited because of thin skins Last edited by JohnRR; 04/14/11 10:32 AM.

Re: question on rear swap on my 69 Dart DELETED [Re: JohnRR] #972823 04/14/11 10:06 AM 04/14/11 10:06 AM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	Post deleted by tboomer Last edited by scratchnfotraction; 04/14/11 10:08 AM.

Re: question on rear swap on my 69 Dart [Re: scratchnfotraction] #972824 04/14/11 10:12 AM 04/14/11 10:12 AM
Joined: Jan 2003 Posts: 74,948 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 74,948 U.S.S.A.	Sorry scratchin , I wasn't referring to you or the grammar nazi as fruitloops . Nice picture , right click save as ...

Re: question on rear swap on my 69 Dart [Re: JohnRR] #972825 04/14/11 11:13 AM 04/14/11 11:13 AM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	For give my Ignorance then,thank you. back on topic.. i have a set of c-body axle that can NOT be cut down to A-body specs,a set of 72 4x4 truck axles that CAN be cut down,but have the 5 on 5.5 wbp. my 67 polara axles are 30" long and CAN be cut down,but I am told a 67 polara is a c-body. but dont some of the B-bodys and E-bodys use a 30" axle? C-bodys and trucks/vans are the best place to find axles that are not tapperd down and could be cut to A-body specs,IMHO the C-bodys are hit and miss KG just poped a re-splined 8 1/4 axle couple days after doing it,IMHO the 299$ for a set of moser custom alloy axles are worth the $ to do it right the first time. Doctor diff can set you up for whats needed and a fair price as well

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