489 Rear Diff Convert to Posi

Go Fly · Mar 21, 2019

i have an open 489 and would like to convert to posi if possible or cost effective.

For a 68 Super Bee.

WP29440SE · Mar 21, 2019

what the hell is a posi

Kern Dog · Mar 21, 2019

mopar 3 B · Mar 21, 2019

impossible to convert to a posi

NoCar2023 · Mar 21, 2019

https://www.quickperformance.com/Chrysler-8-34-Sure-Grip-Power-Lock-Posi-Unit_p_20442.html

Damn, these things are pricey....maybe search ebay for a used one.
Here is one from Dr Diff.

https://www.ebay.com/itm/Chrysler-Mopar-8-3-4-8-75-Power-lock-Clutch-Sure-Grip-Posi-Fully-Machined-New-/173833672012 View attachment 737467

NoCar2023 · Mar 22, 2019

Here is another option.

https://www.summitracing.com/parts/...GJWu5CPaU8nru_GUibcf-mnQ_gqYPdwxoCFsAQAvD_BwE

66Satellite47 · Mar 22, 2019

No problem converting the open to a limited slip of one sort or another. Two options for OEM, early Dana style clutch or the newer cone style. I like the early style, rebuildable version. Aftermarket versions may be a good choice. Seems like aftermarket prices are pretty good. But check with an expert, Dr. Diff?

Go Fly · Mar 22, 2019

Brutal

But deserved. Sorry gang it’s a sure grip.

chtampa · Mar 22, 2019

Isn't the Dana called a Power Loc?

Frank Mopar · Mar 22, 2019

1972GY8SE said:
Here is another option.

View attachment 737468
https://www.summitracing.com/parts/...GJWu5CPaU8nru_GUibcf-mnQ_gqYPdwxoCFsAQAvD_BwE

I have one of these setups in my car. Shes has a make a pretty loud clicking noise when turning which is normal. I always get the “somethings wrong with your rear end” comment but When you mash the gas both side hook no problem

Would I put another in? Nope.

66Satellite47 · Mar 22, 2019

Used in earlier 8 3/4"s. Same style as in the Dana 60. I like the re-buildible design.

NoCar2023 · Mar 22, 2019

American Motors: Twin-Grip
Buick: Positive Traction. Gran Sport models used the term "Limited-slip (differential)"
Cadillac: Controlled
Chevrolet/GMC: Positraction
Chrysler: Sure Grip
Dana Holding Corporation:Trak-Lok or Powr-Lok
Eaton: No Spin
Ford: Equa-Lock and Traction-Lok
Jeep: Trac-Lok (clutch-type mechanical), Tru-Lok (gear-type mechanical), and Vari-Lok (gerotor pump), Power Lok
Oldsmobile: Anti-Spin
Pontiac: Safe-T-Track
Studebaker-Packard Corporation: Twin Traction
Yukon Gear & Axle: Duragrip
Many of our fellow enthusiast: (including Differential suppliers) "Posi"

Cranky · Mar 22, 2019

The newer style cone SG can be machined once it quits working but it needs to be done right away instead of just hammering it trying to make it work.....because that won't happen. I've done many of them over the years and then they are good again for many more years. The main thing I don't care about the early 8 3/4 style SG is the smallish center thrust pin and the smallish spiders. Generally, the center pin gets messed up because of improper axle adjustment and isn't strong enough to take much improper adjustment. The cone unit has a much larger center pin and can take it plus it's trapped in place unlike the Power Lok. Also, the Dana 60 PL is a much larger unit than the 8 3/4 unit.

489 Rear Diff Convert to Posi

Go Fly

Well-Known Member

WP29440SE

Well-Known Member

Kern Dog

Life is full of turns. Build your car to handle.

mopar 3 B

Well-Known Member

NoCar2023

Well-Known Member

NoCar2023

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66Satellite47

Well-Known Member

Go Fly

Well-Known Member

chtampa

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Frank Mopar

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66Satellite47

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NoCar2023

Well-Known Member

Cranky

Banned Henchman #27

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