Moparts

how much would you sell a 8 3/4?

Posted By: enelson

how much would you sell a 8 3/4? - 08/24/08 02:19 PM

Thinking of upgrading to a dana or more stout 9" in my dart before I go out and blow this one up. I'm paranoid mostly because the 496 is night and day different from the old 383, and I've read too many stories on this board with diff carnage. I posted this on the WiW board and it just sat there, so I figure I'll ask you guys in Q&A

Here's the nuts on it:
- Factory cone type posi, new bearings, 742 case
- 3.91 gears (make a little noise at cruise, but I hear 3.91's typically are noisy)
- Moser axles (not gun drilled super ones) with green bearings
- new brakes, I believe 11" (bought backing plates at the pick n pull and all the rest new)

What would you ask? Has been well taken care of and hasn't been out to the track yet behind my 496. Like I said I'm paranoid, and don't have a trailer LOL

Eric
Posted By: Mr.Yuck

Re: how much would you sell a 8 3/4? - 08/24/08 02:30 PM

I picked up a 3.91 drum to drum unit w/ 472 guts in great shape for $600. You could ask $750 and see what happends.
Posted By: enelson

Re: how much would you sell a 8 3/4? - 08/24/08 05:57 PM

Sounds like a plan, thanks!

I'll crunch the numbers and if I can, will probably see about a moser 60. I think those are about the cheapest drop in deal at the moment??
Posted By: Stanton

Re: how much would you sell a 8 3/4? - 08/24/08 06:09 PM

I'm going with a 543" stroker and not worried about an 8-3/4 with stock axles. Unless you're beating on it all the time (full race schedule) then it should be fine.
Posted By: Mopar1

Re: how much would you sell a 8 3/4? - 08/24/08 09:12 PM

The 8.75 came from the factory in some automatic Hemi cars. That in it's self should be a testament as to the strength of the differential.
Posted By: vancamp

Re: how much would you sell a 8 3/4? - 08/24/08 09:21 PM

A buddy of mine just picked upo an A body 8.75 with 3.91 gears ready to bolt in already built for $550 I dont know what case it was though.
Posted By: RodStRace

Re: how much would you sell a 8 3/4? - 08/24/08 09:46 PM

Quote:

The 8.75 came from the factory in some automatic Hemi cars. That in it's self should be a testament as to the strength of the differential.


I used to agree and say they were in front engine TF dragsters behind blown hemis, but you gotta remember that the biggest tire hanging on the ends of them in that B body were maybe 6 inches wide, and the track prep and tire compounds were slippery enough to
Different ball game today.
Posted By: enelson

Re: how much would you sell a 8 3/4? - 08/24/08 10:13 PM

Quote:

I used to agree and say they were in front engine TF dragsters behind blown hemis, but you gotta remember that the biggest tire hanging on the ends of them in that B body were maybe 6 inches wide, and the track prep and tire compounds were slippery enough to
Different ball game today.



This car is nearly 3500 lbs, and I know this 496 makes more than 500 ft lbs of torque, and is built to leave hard (small ports, 250@.050 cam, 10.5:1)

I may be paranoid, but to me its an accident waiting to happen. Also, I will be driving it to the track and back so I don't mind overbuilding a little bit to be sure I can get it home.

As far as racing goes, I will probably do 10-20 races a year once I have things dialed in. This includes wed nights and big events in the spring and fall here. Right now it's WAY to hot in nor-cal for me. I'd rather ride my bike.

I emailed dr diff on this as well, maybe he'll chime in here. I don't doubt it can be done on a 8.75, but I'd rather spend a little bit now to ensure I don't go hard left into the wall .7 sec into my run
Posted By: enelson

Re: how much would you sell a 8 3/4? - 08/24/08 10:16 PM

Quote:

I'm going with a 543" stroker and not worried about an 8-3/4 with stock axles. Unless you're beating on it all the time (full race schedule) then it should be fine.



Do you have any upgrades done to yours currently? And also if you don't mind what's your current combo? I half-posted this to see what other people are running. I haven't ruled myself out as being paranoid yet but if I'm going to sell the rear, I think it'd be better of me to do it before I go start hammering on it
Posted By: wildman340

Re: how much would you sell a 8 3/4? - 08/24/08 11:21 PM

In stock form the 9" isn't any stronger than the 8 3/4, so if you want better, then go with the Dana 60.
Posted By: MikeyT

Re: how much would you sell a 8 3/4? - 08/25/08 12:16 AM

Eric

Go see Quicktree about 8 3/4 rear ends. He will give you an objective opinion on this matter.....

I'm just kidding, I think $600 to $700 is very fair price

Mike
Posted By: enelson

Re: how much would you sell a 8 3/4? - 08/25/08 12:47 AM

Quote:

In stock form the 9" isn't any stronger than the 8 3/4, so if you want better, then go with the Dana 60.



yea, I was thinking if I could find an upgraded 9" that would work, that would be a viable alternative to a 60. 60's are kinda rare in small a-body widths though, so I am really feeling like going with the new made to order moser 60 would be the best bet for my money, and my mechanic's labor (me)

Thanks all for the input. I know this is a road many have been down before, and I'd rather lean on those with experience than gain my own the hard way
Posted By: RobX4406

Re: how much would you sell a 8 3/4? - 08/25/08 12:52 AM

If you are frugal, you can build a Dana for under 1K.

There was a Dana 60 rear, about 51-52" wide, in the parts for sale in NC with 4.56 gears and a spool for $750 IIRC.
Posted By: 440fied

Re: how much would you sell a 8 3/4? - 08/25/08 03:37 AM

The 8 3/4 is a tough axle to destroy, but a hard hitting 496 will eventually do it with good traction, and enough torque. Put a dana 60 in there, either a Moser, Strange or even a cut down early 70's truck 60 with good internal components, and it will take years abuse from that stroker motor. I would also be concerned about the drive shaft and u-joints, maybe upgrade to a larger diameter driveshaft and 1350 series u-joints with billet yokes from Mancini or someone.

3.91 742 case cone type SG $400 - $450
A-body 8 3/4 housing $150 - $200
Moser a-body axles w/green brngs $100 - $150
11" drum brakes w/new parts $100 - $150

I'd start around $850 to $900 and see what happens, you may have to part it out to maximize your return, a nicely built A-body 8 3/4 shouldn't be that hard to sell. It's easier to come down in price than go back up.

Posted By: nutso suave

Re: how much would you sell a 8 3/4? - 08/25/08 04:10 AM

i just bought a 3.91 clutch type suregrip in a 489 case for $450 today.
Posted By: StandOnIt

Re: how much would you sell a 8 3/4? - 08/25/08 11:26 AM

I bought a drum to drum with a 489, suregrip and 4.30's for 500.00. Stock axles in it. Internals had recently been rebuilt. I would say at least 700.00 with the axles you have in it.
Posted By: scratchnfotraction

Re: how much would you sell a 8 3/4? - 08/25/08 12:24 PM

thats a pile of 8 3/4 rear ends right there,like a stack of history,each ones got a story

never seen 22 in one spot and nicely stack

makes my stack of 3 look small and prob why I cant find none here in FL

Posted By: Mr.Yuck

Re: how much would you sell a 8 3/4? - 08/25/08 12:27 PM

You could just back brace it...most 8.75's break because they flex causing the guts to bind up and them boooom. I think you'd be ok with those numbers and a back-braced 8.75
Posted By: Dakota_Don

Re: how much would you sell a 8 3/4? - 08/25/08 02:48 PM

Quote:

In stock form the 9" isn't any stronger than the 8 3/4, so if you want better, then go with the Dana 60.



or rebuild it with stronger quality parts..

the 8.750 uses less hp then the 9in, and is much lighter then the 60,
Posted By: Dakota_Don

Re: how much would you sell a 8 3/4? - 08/25/08 02:49 PM

Quote:

thats a pile of 8 3/4 rear ends right there,like a stack of history,each ones got a story

never seen 22 in one spot and nicely stack

makes my stack of 3 look small and prob why I cant find none here in FL




i wish i had a stack of 3, lol i have a stack of 1
Posted By: dogdays

Re: how much would you sell a 8 3/4? - 08/25/08 02:55 PM

The 60 isn't that much heavier than an 8 3/4 and in actual back-to-back tests came within one hundredth of a second in the quarter mile. I'd contact DrDiff.

R.
Posted By: fullmetaljacket

Re: how much would you sell a 8 3/4? - 08/27/08 05:45 AM

Go to the Doctor and get the fix you know you need. You'll sleep at night and be awake at the tree with confidence.
I just got my Strange 60 done up by Dr.Diff and will weigh it this weekend against my old 8-3/4 that is pretty much a carbon copy of your rear. It has served me well over the last ten years but I don't want an appointment with any wall at any speed over a stubborn debate.
I'm selling mine also and it has Moser axles in it. The ham is called for already though.
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