12 bolt upgrade to posi parts list
 

Gents,
a few years ago i upgraded my rear end to all new parts and added a Eaton Posi unit.
and ever since I have seen a few threads where other members have been asking about part info on doing the same .
Today i just happen to find my parts list on my computer and thought i would share in case anyone is looking or interested.

remember the truck 12 bolt is not quite the same as a car 12 bolt. and I have a series 4 carrier
all parts where ordered from www.summitracing.com and their part numbers are listed below

Yukon Gear & Axle YA G14071751 - Yukon Gear & Axle Rear Axles
Detroit Locker 913A315 - Eaton Detroit Truetrac Differentials
Motive Gear GM12-373 - Motive Gear Ring and Pinion Sets
Yukon Gear & Axle YK GM12T - Yukon Gear & Axle Master Overhaul Kits
Yukon Gear & Axle YSPCC-010 - Yukon Gear & Axle C-Clips
Dorman 610-138 - Dorman Wheel Studs
Limited slip additive Yukon YGA-15018
Gear Lube, Heavy Duty Plus, 80W90, Hypoid, GL5, One qt., Each Part Number: LUC-10043-1 QTY 2

Re: 12 bolt upgrade to posi parts list
 

Thank you, I have been looking to do this upgrade on my reared man did you just save me a lot of time

Re: 12 bolt upgrade to posi parts list
 

I just put in an Eaton Limited Slip differential. No issues so far but I regret not using the Trutrac instead.

Re: 12 bolt upgrade to posi parts list
 

Just an FYI as I have the same diff, but Detroit specifically says not to use the limited slip additive with the Truetrac (just use GL5 like Valvoline).
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Re: 12 bolt upgrade to posi parts list
 

So did you do an Eaton Posi or a Detroit TruTrac? You say one but then include the part for the other.

Re: 12 bolt upgrade to posi parts list
 

And also check the year of your rear end,1970 only has different axle lengths,

Re: 12 bolt upgrade to posi parts list
 

I do not remember honestly I am pretty sure I did not go with the Detroit locker,
ETN-19556-010 here is the part number for the EATON Posi

Sorry about that, this was several years ago, and summit does not let you archive past orders and they do not keep history for very long

Re: 12 bolt upgrade to posi parts list
 

Last time I upgraded to a posi case my parts list looked like this:

Posi case for the appropriate gear ratio
Fluid and gasket

:mm: but I am particularly frugal ;)

Re: 12 bolt upgrade to posi parts list
 

I wanted to do a full upgrade and refresh across the board

Re: 12 bolt upgrade to posi parts list
 

bigmac73,

Was the studs you used a stock length? The reason I ask is that I converted over to rear dis brakes and need a 1/2 longer stud. Any recommended parts number would be appreciated.

Re: 12 bolt upgrade to posi parts list
 

I am pretty sure they are the stock length,
I also installed the Wilwood rear disk brake set up and installed 20 inch wheels and tires.
I just went with a longer shank on my lug nuts that go deeper into the bolt hole

I am still working on the off frame resto so I have not had it out on the street yet

Re: 12 bolt upgrade to posi parts list
 

Re: 12 bolt upgrade to posi parts list
 

good to see someone is doing well on their analog clock homework (and interesting art work too). ;-)

Re: 12 bolt upgrade to posi parts list
 

:lol:
honestly the kids today are lost when it comes to reading a clock or counting money. one small 15 min lesson and a worksheet in school is about all they get nowadays. And since the wonderful debit card invention. Counting change and handing coins is obsolete so kids are not exposed to money like when I was a kid.

Re: 12 bolt upgrade to posi parts list
 

Money is filthy but ya'll can't send it to me and I will dispose of it properly

Re: 12 bolt upgrade to posi parts list
 

Curious as to your reason for thinking that.

Re: 12 bolt upgrade to posi parts list
 

bigmac73,

Thanks

Re: 12 bolt upgrade to posi parts list
 

The limited slip has clutches that wear out and require replacement. The Trutrac has helical gears rather than clutches and requires no maintenance.