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Offline 7E-Bodies

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Should I Sell This???
« on: August 01, 2021, 01:01:05 PM »
Ok, so I finally tore into the differential on the 70 440 RT. With the engine nearing completion/break in/dyno at the engine shop, the 727 completely rebuilt and ready, original driveshaft restored, I figured the last part of the drivetrain needs to be ready and waiting as well. The 8-3/4 diff was the only part of the power train that wasnít original. Someone had dropped in a 741 3.91 SG and the original open 3.23 was long gone. $1553 later, and I have a new 3.23 and seal kit coming from Dr Diff. The only place I cheated was I went with SG. I figured if someone doesnít like it when Iím dead, they can pull the SG for originality and liquify one tire at a time.
Leading up to my question, disassembly was pleasant. Zero glitter in the lube and everything rotated super smoothly. All teeth look super smooth with no noticeable wear. I know the 741 is the least favored, but maybe someone would love it? What is something like this worth?

Linkback: https://forum.e-bodies.org/engine-transmission-and-rear-end/4/should-i-sell-this/22470/
Kevin

1970 Challenger R/T Numbers Matching 440 Auto in F8 Quad Green

Offline 70vert

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Re: Should I Sell This???
« Reply #1 on: August 01, 2021, 01:11:45 PM »
not sure of a $$ amount, but not much.
I have similar leftover 741 (but with a 2.76 gear), so interested in feedback you get.

Edit: my mistake, I thought the one you were thinking of selling was open. Certainly a sure-grip, and especially if it is the 3.91 gear with good/no wear it would be worth $400+ easy. Whether to keep it mostly depends on if you need that cash and what kind of driving you do. A 3.91 is pretty impractical on the highway unless you have some type of overdrive but if only street driving it is way fun. And if you race it might be worth having a spare but not likely needed if just cruising. Just some thouhgts.
« Last Edit: August 01, 2021, 05:05:25 PM by 70vert »

Offline anlauto

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Re: Should I Sell This???
« Reply #2 on: August 01, 2021, 03:57:41 PM »
Too bad I wasn't closer, I would buy it for my own car....I would say $400-$500 :alan2cents:
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Re: Should I Sell This???
« Reply #2 on: August 01, 2021, 03:57:41 PM »

Offline 7E-Bodies

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Re: Should I Sell This???
« Reply #3 on: August 01, 2021, 04:04:31 PM »
@anlauto $400-500 US or Canadian? I know itíd probably be double that sending a 80?# chunk into Canada or Iíd gladly help you out.

Offline anlauto

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Re: Should I Sell This???
« Reply #4 on: August 01, 2021, 04:12:22 PM »
Well there used to be a rule of thumb...3:23's were $300, 3:55's $350, 3:91's $400, 4:10s $450 etc..That would be the same USD or CDN depending on what soil you were standing on...

Then the fact you have a good sure grip in there, I think it has to be worth that, you can't build on for that...YES shipping would cost a small fortune... :crying:

Offline Brads70

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Re: Should I Sell This???
« Reply #5 on: August 01, 2021, 04:38:32 PM »
If I were in your position I'd hang onto it. Spare parts are always good to have around..... That and you might not be to enthused with 3.23 gears?

Offline gzig5

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Re: Should I Sell This???
« Reply #6 on: August 02, 2021, 06:57:32 AM »
Let me know when you come up with a number.  I've got an extra B-body housing and was thinking of going with a 3.91 if I went through the trouble of fitting it and the spring relocation kit.  We drive between Milwaukee and St. Louis a couple times a year and swinging by Peoria would make for an easy pickup and no shipping.

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Re: Should I Sell This???
« Reply #6 on: August 02, 2021, 06:57:32 AM »

Offline Burdar

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Re: Should I Sell This???
« Reply #7 on: August 02, 2021, 10:13:29 AM »
Nothing wrong with a 741.  Dr Diff actually thinks they are very under rated.
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Offline 7E-Bodies

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Re: Should I Sell This???
« Reply #8 on: August 02, 2021, 10:58:55 AM »
@gzig5 give me a call. Iíll work with you.

Offline dodj

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Re: Should I Sell This???
« Reply #9 on: August 13, 2021, 04:05:56 AM »
Having a spare diff in the garage can be handy to have. I have a spare 2.76 unit that went in the car while I learned about different diffs to buy and how to set up gears when my last set wore out.
I think you will like the 3.23's though. IMO, 391 is too much for a big block if you like to go for a cruise rather than doing stop light launches.
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Re: Should I Sell This???
« Reply #9 on: August 13, 2021, 04:05:56 AM »

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