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Which POSI unit ? #724454 06/14/10 07:18 PM 06/14/10 07:18 PM
Joined: Jan 2010 Posts: 83 Long Island, NY. S Stroked65Belv OP member
Stroked65Belv OP member S Joined: Jan 2010 Posts: 83 Long Island, NY.	I am interested in having a new 489 third member built for my 65 Belvedere. I hear of Nodular casings and then different posi units. Each supplier has his own choice yet I personally are not sure what would be best for my car. Some help from my friends here would help broaden my purchase. I have been told the Sure grip,Auburn, then the Detriot TRU-trac. Cone-type then again the clutch-type gets tighter with the more power to it. Geez who can decide? All a sales pitch.. My application; 65 B body 500"stroker. 550+HP 727 with 3500 stall. Running 29" Hoosier QTP on street with Caltracs. Basically a strong street car. I do not mind an agressive unit on the street as I am not driving long distances. My choice is leaning towards 3.91 gear ratio. Any help is well appreciated. Seems the price most guys are asking is around $1200-1400 with shipping. Any other guys out there have anyone who builds to spec here? Thanks .Bill.

Re: Which POSI unit ? [Re: Stroked65Belv] #724455 06/14/10 07:22 PM 06/14/10 07:22 PM
Joined: Jan 2003 Posts: 21,074 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,074 Niles , Ohio	DR Diff a member here can answer all your questions.If he sees your post he will probally answer.Rocky Chrysler Firepower

Re: Which POSI unit ? [Re: Stroked65Belv] #724456 06/14/10 07:26 PM 06/14/10 07:26 PM
Joined: Jan 2003 Posts: 75,043 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,043 U.S.S.A.	Quote: I am interested in having a new 489 third member built for my 65 Belvedere. I hear of Nodular casings and then different posi units. Each supplier has his own choice yet I personally are not sure what would be best for my car. Some help from my friends here would help broaden my purchase. I have been told the Sure grip,Auburn, then the Detriot TRU-trac. Cone-type then again the clutch-type gets tighter with the more power to it. Geez who can decide? All a sales pitch.. My application; 65 B body 500"stroker. 550+HP 727 with 3500 stall. Running 29" Hoosier QTP on street with Caltracs. Basically a strong street car. I do not mind an agressive unit on the street as I am not driving long distances. My choice is leaning towards 3.91 gear ratio. Any help is well appreciated. Seems the price most guys are asking is around $1200-1400 with shipping. Any other guys out there have anyone who builds to spec here? Thanks .Bill. Stay as far away as possible from an original Cone type , made by Borg Warner and ANY Auburn unit as they are also cone types and you turn them into junk in short order .

Re: Which POSI unit ? [Re: Stroked65Belv] #724457 06/15/10 12:56 AM 06/15/10 12:56 AM
Joined: Aug 2003 Posts: 43,219 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,219 Bend,OR USA	My 1st choice is a 35 spline spool and axles 2nd choice is a Dana clutch type with new clutches and steels Also on all 8 3/4 carriers make sure and get and use a steel cap on the drivers side Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Which POSI unit ? [Re: JohnRR] #724458 06/15/10 12:58 AM 06/15/10 12:58 AM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	I put a Detroit Locker in my 63 about 2-1/2 years ago. It has worked great for my street/strip 63 Ply. I run mid 11's at just over 3700 lbs so my guess is I make about 500 flywheel hp. The locker has worked very nice. Sometimes you feel it lock back in but nothing much as most of the time I dont know it has a Detroit Locker when driving normal. Just had it to the track last weekend as thats about the 6th time I have raced it with the Locker in it. Ron

Re: Which POSI unit ? [Re: 383man] #724459 06/18/10 03:56 PM 06/18/10 03:56 PM
Joined: Jan 2010 Posts: 83 Long Island, NY. S Stroked65Belv OP member
Stroked65Belv OP member S Joined: Jan 2010 Posts: 83 Long Island, NY.	It appears that the Detroit Locker is the way for me to go. If any of you have this unit in your 8 3/4, I would appreciate your likes/dislikes if there are any to share with me. Thanks for your help guys!

Re: Which POSI unit ? [Re: therocks] #724460 06/18/10 04:47 PM 06/18/10 04:47 PM
Joined: Jan 2003 Posts: 21,074 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,074 Niles , Ohio	You might want to contact Dr Diff.Depending on how agressive you drive and if you want to race it you might think about a Dana from him.By the time you buy gears a SG unit have it set up good caps etc.The price of his Danas look better and better.Ill put one in my 65 hopefully before I trash the 391s that are in it now.Rocky Chrysler Firepower

Re: Which POSI unit ? [Re: therocks] #724461 06/18/10 06:14 PM 06/18/10 06:14 PM
Joined: Oct 2007 Posts: 299 Sparta, TN M mark42202 enthusiast
mark42202 enthusiast M Joined: Oct 2007 Posts: 299 Sparta, TN	I have a brand new Moser 8 3/4 housing with a new nodular 489 case, TruTrac w/ 4.10, 33 spline axles out of my 65 Coronet for sale. It even already has brand new disc brakes and rotors on it if you're interested. It's never had a drive shaft bolted to it and has a billet 1350 yoke too. Shoot me a pm if you're interested in any of the parts or all! www.bountyrace.com www.i40dragway.com

Re: Which POSI unit ? [Re: mark42202] #724462 06/18/10 06:47 PM 06/18/10 06:47 PM
Joined: Dec 2006 Posts: 4,647 aotearoa rebel master
rebel master Joined: Dec 2006 Posts: 4,647 aotearoa	detroit locker in my 'cudas 83/4 here. sooo much better than the cone type that was in it before & more manners than the spool on the street.

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