489 diff question

[BAFRAID]

I’m getting ready to purchase a new third member for my 1969 Super Bee automatic with a 383. I’m ordering through Dr. Diff and I’m at the differential section. I’m not sure which of these I’m supposed to pick. I want a sure grip. I’m thinking the choice would be the 6 helical sure trac 2?
Advice please. I have been emailing him as it sounds like he is super busy and not able to take phone calls currently.

 

[Sahara]

Personally I wouldn’t use a spool on the street. With a spool you essentially have a solid axel with no differential.

 

[BAFRAID]

What would I choose instead?

 

[Sahara]

The first one of the three choices shown.

 

[Sahara]

The spool is cheaper in this instance because there is nothing to it; essentially just a solid steel collar that joins both axels together. The sure trac is quite a bit more complicated to make, thus more expensive. I personally have no personal experience with that exact unit, I just know that you need some sort of limited slip differential rather then a spool.

 

[Sahara]

Dr. Diff is awesome in their awesomeness, by the way. I got my 489 case rebuild kit there. Many of the guys on this site buy there.

 

[65-440]

Truetrac for sure, I won't run anything else unless I need a locker..... screw clutches! Truetrac and plain Jane 80w90 gear oil, done!

 

[451Mopar]

That looks like options to the base configuration? What differential comes standard? Maybe the maybe the clutch type powr-loc ?
I would call to see what options there are. On a street car you don't want a spool, but some type of limited slip or the sure-track?
The helical Sure track can have different torque bias ratios built in. I'm curious what the torque bias ratio of the Dr. Diff Sure-Track is.

 

[65-440]

That looks like options to the base configuration? What differential comes standard? Maybe the maybe the clutch type powr-loc ?
I would call to see what options there are. On a street car you don't want a spool, but some type of limited slip or the sure-track?
The helical Sure track can have different torque bias ratios built in. I'm curious what the torque bias ratio of the Dr. Diff Sure-Track is.

Pretty sure he doesn't do his own truetracs, just sells the Detroit units....at least that's how it was when I bought one of mine through him.

 

[justcruisin]

Dr Diff sure-trac is his own unit that he has built in bulk lots. Helical gear, but not the same as the truetrac.

 

[65-440]

Dr Diff sure-trac is his own unit that he has built in bulk lots. Helical gear, but not the same as the truetrac.

Just looked it up, that's pretty cool. Might have to try it out on my next diff build!