So i want to put a posi locker in my rear end.
I have the 8.8 housing i think lol.. my truck is an 08 f150 4.6 2v and only pulls with one tire! sad

Will adding the posi locker help with better take off at WOT???

Have a set of 4.10 gears but waiting for a posi locker to come by so i can do it alll at once!

So if any one can help me i would really aprecciate it! =)

 

1). Unless it has been changed by someone, your '08 F150 4.6L has the 8.8" rear axle with 31 splines.

2). A posi and a locker are two separate things. A posi, also known as a limited slip differential will provide power to both rear wheels under most conditions, yet it still allows them to turn at different speeds to negotiate corners smoothly. A locker is a more aggressive traction aid that will provide power to both wheels under pretty much any condition, but is less forgiving on the road than a limited slip. To answer your question though, either one of these will help get the power to both rear tires. If you had problems with traction before, I would imagine a limited slip (posi) or locker either one could go a long way towards helping you.

 

Absolutely correct.

The 8.8 rear axle has 31 splines, the 9.75 has 34 splines, and the front 8.8 has 28 splines.

 

Ok that was a good lesson guys!!! now i need to find a posi or a locker with 31 splines!!!

Thank you both very much!

 

here is a detroit truetrac for a 31 spline 8.8

http://nationaldrivetrain.com/shopsi...trac_ford.html

http://www.drivetrainspecialists.com...duct-5411.html

and the detroit locker for the 31 spl 8.8

http://nationaldrivetrain.com/shopsi...lock_ford.html

http://www.drivetrainspecialists.com...duct-1125.html

Both are a simple bolt in and neither one reqiures friction modifier like the clutch type posi units.

 

The TrueTrac requires you to NOT use friction modifier and only conventional gear oil.

 

I am going to install an Eaton Detroit True-Trac in my 1998 F150. Has anyone had any maintenance issues with this LSD? I ask because of the link below. Apparently the Eaton LSD had some issues with Nissan Truck owners. The only maintenance I would expect to perform on the LSD, would be rear differential fluid changes.

http://www.titantalk.com/forums/tita...d-problem.html

 

Looks to me like the installer just needs to Loctite all the bolts.

 

I have been running a TrueTrac in the rear for over a year. I am not even aware of it being there except when I need the extra traction. To answer your question, no I have had zero issues with the unit. One of the best mods I have done with the truck.

HYPO

 

The Truetrac is a wonderful limited slip. Nothing to wear out, so it stays at the same level of performance essentially forever. Plate or cone clutches wear out and their performance degrades over time. I have one in my '86 F-250 and if they made one to fit the SF 10.25 in my F-150, I'd have on there in a heartbeat.

It's true about the Truetrac wanting a conventional oil. Some synthetics make them get noisy. Some don't, but it best to go with a high quality conventional gear oil anyway to be safe. I used Amsoil in mine for a while and it seemed fine, but eventually I switched to LE-607 (rated a grade 90 but really an SAE 110 grade oil). LE (Lubrication Engineers no longer makes LE-607, but I think they have a replacement.

 

I did it aqnd im loving it!