[66bonne]

way to go Jeff !!

Jim

[pontiacjeff]

This posi is gonna be sooooooo cool! Finally an answer to our collective prayers. Now EVERY SINGLE ONE OF US can have a limited slip posi safe-t-track whatever you want to call it, with out searching for 40yr old worn out factory units, , huge labor expenses involved with swapping carriers, and long down-times. Every one of us on this forum is capable of doing this installation in the driveway or garage In two hours or less!

I will have the prototype installed in the Rearend and tested for breakaway torque by Tuesday afternoon. With pictures!!!!

[Ragtop Man]

Gonna need some burnout shots of the Stawag 'testing' the new assembly!!!

[Nickv]

I'm in!!

[mnfatcat]

This is great news. A 3:55 posi rear is on my list of wants for sure. Wondering though if the 2:41/2:56 carrier is the same as the 2:73, 2:93, 3:08 carrier. I have a suspicion they may be different. Does anyone know ?

[pontiacjeff]

They are different by .200". The 3.55s are made to fit the 2.73-3.08 carrier. As it turns out, this Rearend I bought is a 2.41.

[mnfatcat]

Sorry to burst your bubble, thought that might be the case. You can machine up a spacer and still be able to use your 2:41 carrier. I have used spacers on ring gears in the past in very extreme usage applications without incident.

There are likely going to be future customers of your product that are going to be in the same situation and will opt for a spacer, so you should have them available anyhow.

In cars with manual transmissions, using slicks, it would be wise to get the right carrier.

[pontiacjeff]

I made a .200" ring gear spacer for my wagon using a 2.5-series carrier with a factory 3.55 r&p. If enough people with 2-series carriers order a limited slip conversion, I will start offering the spacer. But there are not many 2.41-2.56 cars out there to begin with. That gear was only in low-output 389/400 2bbl cars as a highway option. Most common gears were 2.73/2.92/3.08.

[pontiacjeff]

The differential is prototyped and will be installed this weekend! Tho not in my wagon. It is not ready to drive yet,. Its going in a 65 Catalina 4-door with a hot 389 and automatic. It's a highway gear, probably a 2.73, but I'll know for sure on Friday! Pics and burnout vids coming soon!

[aronhk_md]

Thats awesome Jeff. Will you also make one available to fit a car with 3.23 gears?

[pontiacjeff]

Originally Posted by aronhk_md

Thats awesome Jeff. Will you also make one available to fit a car with 3.23 gears?

This limited slip conversion kit will fit any open differential from the export-only 2.29 all the way up to a 4.11!!!

[aronhk_md]

Very cool Jeff. Any idea yet what the price point will be? Still trying to decide if I just put in the posi carrier I have from a 2.73 with a shim to use my 3.23 gears.

If you need a test bed in a 67 GP conv with a 3 spd manual let me know lol Its a 3 spd on the floor and will hopefully be getting a turbo in the next year or so. Definitely need posi. lol

[pontiacjeff]

It works!!!! Uh... I mean, just as I anticipated, the limited slip conversion for the Pontiac std open differential works as designed. As installed in the Pontiac fullsize, the prototype tested at 118lbf/ft breakaway torque prior to break-in. The car would spin the right rear tire very easily, laying down 50ft of rubber. Its a 2.41. And now, no matter how hard I tried, it will not spin AT ALL! !! I have to heat-treat the plates for the 8.5 and it will be next.

[aronhk_md]

Try it out in mine Jeff......it'll spin both tires. hehehe. Any closer to figuring out price?

[pontiacjeff]

Originally Posted by aronhk_md

Try it out in mine Jeff......it'll spin both tires. hehehe. Any closer to figuring out price?

Ha! I just sent you a pm!!!! You still have my number?

[OZZIEVILLE 67 2 door]

Sounds good Jeff..
Would you send to Australia
John

[pontiacjeff]

Originally Posted by OZZIEVILLE 67 2 door

Sounds good Jeff..
Would you send to Australia
John

Ill ship to Australia. Ever hear of Southern Classics in Canberra?

[pontiacjeff]

Announcing the availablity of the Engineered Performance Limited Slip Differential for the Pontiac fullsize 8.875" 12-bolt differential. This kit will fit ALL 65-76 8.875" differentials with the 30-spline bearing retainer or c-clip axles. It will also fit the 73-81 8.75" P-axle with the 28-spline c-clip axles as installed in some 73-75 A-G, 73-77 A-wagon, and 77-81 Pontiac/Cadillac/Olds/Buick fullsize. This is a do-it-yourself kit for use in any STOCK OPEN DIFFERENTIAL to convert it to limited slip operation. The kit is easily installed by the DIY'er in the driveway in 2 hours or less.

The prototype has been in for 1000 daily driven miles. It is in a 65 Catalina 389 auto. With the stock open differential, it would spin the right rear tire about 50feet. With the EP-LSD installed, it WILL NOT SPIN THE TIRES NO MATTER HOW HARD WE TRY!!!! The only time it did was when we wet the pavement and it spun both tires equally.

The unit, as-installed, set up at 118lbs/ft breakaway torque. After the test miles, I disassemled the unit and checked for wear and potenial problems. The clutches were broken-in nicely and had no measureable wear (this material has proven over 100,000 miles in other applications), the plates showed no signs of wear (they have been used in another application for 4 years, so they are also WELL tested), and the breakaway increased to over 120lbs/ft. I didn't want to spec it for fear of breaking the lug nut stud. The unit operated flawlessly with NO CHATTER. It uses regular gear oil and requires NO ADDITIVE.

Allow 5-7 business days for build time from the time you place your order. Please email me at tech@engineered.net for more info or to place your order.

[pontiacjeff]

The kit consists of a specially modified set of gears; two sintered-bronze clutches; cnc-machined, heat-treated pre-load plates; and application-specific pre-load springs; and an installation tool (deposit required). The stock gears will need to be returned with the installation tool to receive full core refund.

[pontiacjeff]

There will NOT be a tool deposit. I have reconsidered the installation. I will be including in the kit two keepers that will be used for installation and you can stick them in the glove box like a wheel lock key in case you ever need to take it apart and put it back together.