8 1/4 to 8 3/4
#939668
02/28/11 11:46 AM
02/28/11 11:46 AM
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Joined: Jul 2008
Posts: 27 virginia
1x59rr
OP
member
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OP
member
Joined: Jul 2008
Posts: 27
virginia
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I am going from a 8 1/4 to an 8 3/4 in my dart. Are the backing plates and drums the same. if they are not, will any 8 3/4 set work or do they have to be a body specific
Mark 69 RR
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Re: 8 1/4 to 8 3/4
[Re: Kern Dog]
#939672
02/28/11 01:43 PM
02/28/11 01:43 PM
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Joined: Jan 2003
Posts: 75,043 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,043
U.S.S.A.
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Quote:
Many of the stock driveshafts that I have seen sit with the yoke over an inch and a half OUT of the trans with the vehicle at rest. All of my cars sit at or below stock ride height, and the suspension travel is less as well. Less suspension travel means less fore/aft slide of the yoke. If you have 3/4" to one inch of yoke out of the trans with a driveshaft in a zero angle straight line into the trans, wheres the problem? I am certain that in a truck or a vehicle with lots of suspension travel things would be different. Sorry if I was unclear. I sometimes forget that My methods can be unusual!
You are making a lot of assumptions on this persons build.
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Re: 8 1/4 to 8 3/4
[Re: 1x59rr]
#939677
02/28/11 04:36 PM
02/28/11 04:36 PM
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Joined: Jan 2003
Posts: 75,043 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,043
U.S.S.A.
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Quote:
Quote:
Need more info before making any recommendations...
Does the 8 3/4 have large bolt pattern axles , if so are they new axles with the big car brake offset or redrilled small bolt pattern axles ?
As far as the driveshaft , if the 8.75 is longer than the 8.25 how can anyone say it's onk to to use a draveshaft that is obviously too long ?
right now I only have the housing, will be getting axles from mancini and they will be big bolt pattern
OK , as long as they have the bigger car offset you can use the brakes from the 8 1/4 rear , assuming that's what you want to use .
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Re: 8 1/4 to 8 3/4
[Re: JohnRR]
#939678
02/28/11 04:50 PM
02/28/11 04:50 PM
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Joined: Jan 2003
Posts: 8,940 Holly/MI
Dean_Kuzluzski
master
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master
Joined: Jan 2003
Posts: 8,940
Holly/MI
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Unless someone wants to take the trouble of checking the full suspension travel to see if the driveshaft stubs itself into the transmission there's no way you should take this for granted.
Do it right for $90 or run the risk of tearing up a driveshaft, trans, floorpan and/or rear yoke.
I did a similar but way different swap from an 8.2" GM rear end assembly to a 8.5". Driveshaft wouldn't even go in. Ran the car for many years prior to that.
R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04
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