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8 3/4 ID help needed...if you can?? #987597 05/07/11 12:34 PM 05/07/11 12:34 PM
Joined: Sep 2005 Posts: 1,978 USA S Suregrip391 OP top fuel
Suregrip391 OP top fuel S Joined: Sep 2005 Posts: 1,978 USA	I was just wondering what I have here? Its definitely an 8 3/4 rearend, but it has a 5.5" bolt pattern? (I have seen plenty of 4" and 4.5") But this is 5.5" bolt pattern. It measures 43.5" center to center on the spring perches, and overall 58 1/4" flange to flange. It also has what appears to be 12" O.D. drums? Im guessing some sort of truck rear? I have not taken it apart yet to see what gears it has, but it does have a 489 center section...Anyone know what I might have here? Thanks in advance.

Re: 8 3/4 ID help needed...if you can?? [Re: Suregrip391] #987598 05/07/11 02:09 PM 05/07/11 02:09 PM
Joined: Dec 2008 Posts: 1,285 okla. sam64 pro stock
sam64 pro stock Joined: Dec 2008 Posts: 1,285 okla.	sounds like a 4 wheel drive 1/2 ton with ford pickup pattern,5 on 5 1/2.

Re: 8 3/4 ID help needed...if you can?? [Re: sam64] #987599 05/07/11 02:35 PM 05/07/11 02:35 PM
Joined: Jan 2003 Posts: 21,065 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,065 Niles , Ohio	Might be an Imperial rear.They had big bolt patterns and huge brakes.Rocky Chrysler Firepower

Re: 8 3/4 ID help needed...if you can?? [Re: sam64] #987600 05/07/11 06:09 PM 05/07/11 06:09 PM
Joined: Sep 2005 Posts: 1,978 USA S Suregrip391 OP top fuel
Suregrip391 OP top fuel S Joined: Sep 2005 Posts: 1,978 USA	Thank you guys, I went out to check the ratio and when one side turns clockwise I can see the other side turning the opposite direction. Also, turning the wheel one revolution, makes the driveshat spin around two times. So that means I have an open diff, either 3:91 or 4:10 (:11) ?? I was told on open diffs you double the driveshaft rotation to obtain the ratio. Does this sound correct? Thanks again in advance for anyone that can reply!

Re: 8 3/4 ID help needed...if you can?? [Re: Suregrip391] #987601 05/07/11 06:16 PM 05/07/11 06:16 PM
Joined: Aug 2003 Posts: 12,291 Kent, Wa 340SHORTY Truck Nut
340SHORTY Truck Nut Joined: Aug 2003 Posts: 12,291 Kent, Wa	if the perches are on top of the tubes its most likely a 70/74 4x4 1/2 ton Dodge/Plymouth RC, TD,or pickup rearend.... I am truckless..

Re: 8 3/4 ID help needed...if you can?? [Re: 340SHORTY] #987602 05/07/11 06:36 PM 05/07/11 06:36 PM
Joined: Sep 2005 Posts: 1,978 USA S Suregrip391 OP top fuel
Suregrip391 OP top fuel S Joined: Sep 2005 Posts: 1,978 USA	Yes, just checked, perches on top. 2" wide brake shoes, and inside of drum measures 11" across where shoes would ride. So I'm correct in saying 11" brakes? Appreciate all the help guys.... Just want to make sure what I have and decide what to do with it,

Re: 8 3/4 ID help needed...if you can?? [Re: Suregrip391] #987603 05/07/11 08:23 PM 05/07/11 08:23 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: I was told on open diffs you double the driveshaft rotation to obtain the ratio. Does this sound correct? yes live every 24 hour block of time like it's your last day on earth

Re: 8 3/4 ID help needed...if you can?? [Re: 340SHORTY] #987604 05/07/11 08:37 PM 05/07/11 08:37 PM
Joined: May 2003 Posts: 6,560 Downtown Roebuck Ont Twostick Still wishing...
Twostick Still wishing... Joined: May 2003 Posts: 6,560 Downtown Roebuck Ont	Quote: if the perches are on top of the tubes its most likely a 70/74 4x4 1/2 ton Dodge/Plymouth RC, TD,or pickup rearend.... Except for the 5.5" bolt circle. Kevin

Re: 8 3/4 ID help needed...if you can?? [Re: Twostick] #987605 05/07/11 08:51 PM 05/07/11 08:51 PM
Joined: Aug 2005 Posts: 11,543 chicagoland,usa B buildanother I Live Here
buildanother I Live Here B Joined: Aug 2005 Posts: 11,543 chicagoland,usa	Why, what's wrong with the 5 1/2" bolt circle? That's correct for early 4x4

Re: 8 3/4 ID help needed...if you can?? [Re: Twostick] #987606 05/07/11 10:05 PM 05/07/11 10:05 PM
Joined: Jan 2003 Posts: 8,016 Polson, MT DoctorDiff master
DoctorDiff master Joined: Jan 2003 Posts: 8,016 Polson, MT	'69-'71 and '72-'74 D-100 4X4s came with 5 x 5 1/2" bolt pattern 8 3/4" rears Contact info

Re: 8 3/4 ID help needed...if you can?? [Re: DoctorDiff] #987607 05/07/11 11:23 PM 05/07/11 11:23 PM
Joined: May 2007 Posts: 1,675 Mi. G-Money1320 top fuel
G-Money1320 top fuel Joined: May 2007 Posts: 1,675 Mi.	I had a 74 4X4 short box 318 stick with an 8 3/4 with a 3.55 sure grip in it a few years ago and it was the big bolt pattern. I was told it was called a heavy half ton with the larger bolt. It was all factory as I had the invoice. 416 stroker from Nick at Compu-flow. 11.14 in full street trim. Seems like a new best every time out. 11.06 open headers----so far!!

Re: 8 3/4 ID help needed...if you can?? [Re: buildanother] #987608 05/08/11 01:34 AM 05/08/11 01:34 AM
Joined: May 2003 Posts: 6,560 Downtown Roebuck Ont Twostick Still wishing...
Twostick Still wishing... Joined: May 2003 Posts: 6,560 Downtown Roebuck Ont	Quote: Why, what's wrong with the 5 1/2" bolt circle? That's correct for early 4x4 Ahhh the day isn't a waste after all. I just learned something. Did not know that about 4x4's. Kevin

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