Rebuilt Magnesium 8:31 915 W/Wevo Bearing retainer

[jamesjedi]

Hi,

I have a rebuilt 915. It is a magnesium box with an 8:31 r and p. It has the Wevo bearing retainer and is non LSD. Zero miles on it. I put oil in it a four years ago thinking that it would be installed - which it has not. Work was done by Response Engineering. I do not have the paperwork for it.

What should I ask for it?

As always - thanks for any help.

[Matt Monson]

Start at $5k. No paperwork might hinder the sale but being an old member with good history might be enoigh to close a deal based on who you are.

[jamesjedi]

Matt - thanks for the response. Wow! I had no idea that it would be worth that much.

I will try for that price. Thanks again.

[davewadd]

$5k seems high for a non-LSD 915.

[jamesjedi]

Matt - would this not be a 3 liter Carrera box?

[Matt Monson]

Core: $2500-3000
Bearing Plate: $275
1/2 shift sleeve: $275
3/4 shift sleeve: $295
synchros : $115x5 $575
Labor: $1000

That puts you at $4920-5420. That does not include any bearings (up to $1200 in parts) or a 5/r slider ($800). No dog teeth ($125 ea) and another $100 for a gasket kit and new nuts for the ones that can't be reused. One can easily spend $5k making a core into a good gearbox if you buy a "good used" core here. I say start at $5k and be negotiable.

Mag case 8:31s ran from 1975 through 1977 in a variety of models and I have even seen some 915/61 mag gearboxes in early productions '78 SCs. Is it mechanical speedo or electronic? The mechanical speedo is pretty rare and only 1975. I would add $500 if it's mechanical because that 8:31 was a one year only item.

[Matt Monson]

Why would he warranty it? It is neither new nor guaranteed. You want a remanufactured gearbox you're going to spend double to triple my labor number and all the parts. That's a $10k gearbox. And guys who don't hang out on a diy forum are paying that.

[jamesjedi]

Thanks for the replies. It is a big help.

I will post today with pictures tomorrow.

[jamesjedi]

I found what could be an issue. The bottom of the case has a broken part. I have circled it in red. The box has been rattle can sprayed silver. Please see the pictures. Thanks for any help.

[Matt Monson]

Both the paint and broken boss are big value killers. Electronic speedo so a later box. Is thw type number fully scraped off?

[Mehoff]

if I were a buyer I would seriously question the "rebuild" given the paint. Makes zero sense; either wasn't opened or the builder didn't give two sh$ts about quality.

Not an accusation, just a perspective if I were looking to lay out the cash.

[jamesjedi]

I will always listen to input. The builder is respected. My guess is it just looks beter? Magnesium cases are not the best looking.

Matt - I will look at the numbers and post, then I may repair what needs to be repaired.

[Matt Monson]

There’s a lot of pock marks from corrosion. The mag in areas was really ugly before painting it. The problem is many of us treat a painted gearbox like a red fan on an engine. You won’t get my early number for it, unfortunately.

[jamesjedi]

"Red fan". Can't have that.

Thanks for the guidance. I will have a mechanic I like check it. He was trained at the factory.

[jamesjedi]

Thanks for all the replies. Can I repair the case? Or does it have to be replaced?

[Matt Monson]

Wevo makes a widget that fixes the broken boss.

[specialtyoneinc]

Was quoted recently roughly $5k to rebuild a 915 and add a Wevo classic shifter kit. Transmission had minor synchro issues and 120k miles.

[mepstein]

I had the same broken piece. Ben/mb911 fixed it. He’s a pro welder. He can fix all kinds of mag, alum and steel parts.

[jamesjedi]

Thanks for all the replies. Looks like the boss can be repaired. I find that surprising as it is magnesium.

Do I wire brush the case? How much corrosion is to much and not worth the repair?

[Matt Monson]

Don't mess with it. While painted isn't desired you'll never get it properly cleaned off with it being so fresh. It will get harder to sell I suspect.