I'm still getting the frame just the way I want on the 79 donor. I want to replace the third member with posi (limited slip is probably the correct ford term). I don't know what life has in store in the future and want to replace it with a good product that will handle a lot of horsepower. Don't want to have to replace it again in the future if I change engines again. Can anyone give me some companies that make a good product? This is a 9 inch rearend. I'm looking at buying a complete drop in third member.

There seems to be about 4 options: mini spool, limited slip, eaton setup, and another that I forgot. Mini spool is full duel wheel all the time. Can anyone also give suggestions on which unit is better than another?

 

Well here are my thoughts from best to worst in order.
1. The Eaton gear type limited slip-smooth, no wearing parts, strong.
2. The Ford clutch type limited slip-wears well, inexpensive, lots of miles of use.
3. The Loc-Rite??? or similar-not impressed with the strength and cost.
4. Mini spool-simple, but NOT street friendly at all, will cause wear in other axle, driveline components.
I have a rebuilt(by me) Ford limited slip in my '66 and it has held up for many miles and some hard use.

 

Do alot of research before wasting money on a limited slip....

You need to decide if you want a limited slip, or a locker...limited slips are fine for street use where you have equal weight on each tire..they will spin them both..if you get off road at all..LIKE GETTING FIREWOOD ETC... and get your suspension twisted up where you have one tire unweighted, or a little light, or god forbid, off the ground, the limited slip is gonna let you down and **** you off.

Now if you had a locker, you could have one tire hanging three feet in the air, and the one firmly planted on the ground will push you through.

OK, I'll be honest...I don't like limited slips...they are better than no traction device but thats about as far as I can go with it.

You wanna spend your money once...Buy a Detroit Locker....Throw all the power and abuse you want at...you won't wear it out, or break it...They are aggressive, you will always know its back there, you will have accelerated rear tire wear, (there are some trade offs for extreme performance) I have had Detroits in Three of My pickups, one I put 305k on. I have one in my Jeep now. This is an Automatick Full Case Locker, you step on the gas, it locks both axles solid, let off it unlocks.

You want seamless street performance get a limited slip
The Eaton posi is one of the better ones.
The OEM tracklock one of the worst. (Very weak Performance)

Leave the mini spool and lockright out of the equation, the are both only as strong as the stock carrier they go into.

Greg

 

Thanks for the suggestions.