Predator

Also, if you go to the Driveline-Solutions website, they have True Trac listed as an option for their 9 inch.

BADSS

iTrader: (7)

You sure did! LOL! I missed that post, I apologize. However, the True Trac is not a "soft locker"- which is definitely not the same thing as a posi/limited slip differential. Posi and limited slip are two terms that mean the same thing.

I see a lot of confusion about differentials- and when you said you did not want a posi, I assumed you were thinking the true trac was a locker.

What did you end up deciding to do, Predator?

To everyone else- I know that a 9 inch is heavier, sucks up more HP, has a less than ideal pinion angle, and requires "clearancing" to install in an F-body. But they are widely considered bulletproof- and if you do a search, there are a lot of unhappy 12 bolt owners out there- some who end up buying a 9 inch down the road, and even some who go back to the stock 10 bolt rear (Gomer did, for one).

Besides the reasons I listed, what would be the other downsides to a Ford 9 inch- say with a posi- for street driving?

Predator

BADSS, I stand corrected on the "soft locker" comment then. I thought a soft locker was a gear-driven limited slip. In fact, now I don't know what a soft locker is. I do know what a locker is.

Well, I'm going with Jim's recommendation (on the previous page) with the exception of 4.10s instead of 3.73s. I'm pretty sure a Billingsley Strange 12-bolt, completely assembled.

I appreciated your input. Thanks!

Jimmy P

iTrader: (177)

I would recommend against the Eaton, but thats just because of my personal experience. When I first had it in, it would roast both tires nicely. 3000 miles of somewhat hard street driving on drag radials and I'm doing one wheel burnouts when I get on it now.

Predator

Thanks for the head's up Jim.

lsevenl

iTrader: (5)

I decided to go with the Billingsley 9''. Ordered it a few weeks ago. I am looking to do it right the first time.

BADSS

iTrader: (7)

Good luck with your 12 bolt. Billingsley is good people- they will help you out if you have any problems with it.

I think a soft locker is the same as a regular locking differential except for the fact that it should lock and unlock more smoothly and make less noise.

NumberOneSled

iTrader: (1)

What kind of options did you go with?

One Bad Z

iTrader: (1)

Same here. Im in the process of doing a tranny and rearend swap. The car is not my daily driver and it pretty much only gets drove on the weekends. I am going with a 9" simply because i can change center sections in a few hours from street gears to all out race gears when i go to the track. Im going with either a locker or spool with 3.90s....also going to do some more suspensoin work while everything is apart.



Im sick of the 4l60e's. Im on my third one in less than two years. Fixing the problem with th400 w/transbrake,3500-4000 stall, trans cooler w/elec fan

Predator

Thanks BADSS! But now it looks a Moser 12-bolt with a True Trac. If I could get a gear-driven posi in a Strange, I would prefer that. I just never wanted a traditional posi.

Also thanks for the explanation of a soft locker, and I see that it's an entirely different animal than the True Trac, it's a type of locker.

EPP

iTrader: (22)

The True Trac is actually about the same price. The 33 spline axle option for the True Trac is only $65.00, instead of $100.00 like it is for the Eaton Posi. Bob