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Discussion Starter · #1 ·
i understand that some 122s had limited slip diffs and others had conventional diffs installed. how to identify what's on my car? i have a '67 122s 4 door 4 speed no OD.

thanks!

BTW, while she's not pretty, she's become our DD, and we take her on longer (250+ miles) road trips with no problems.
 

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Also, you can jack one of your rear tires off the ground (flat road). Carefully take the handbrake off and transmission in neutral. With an open diff, you should be able to spin the rear wheel and the driveshaft. A limited slip will probably not spin at all by hand.

The main (if not only, for a 100 hp car) benefit of the limited slip is in the snow.
 

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Discussion Starter · #3 ·
no need for a ls diff for me. just trying to figure out what type of fluid to put in it.

thank you gentlemen, for your prompt answers.
 

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Revival. In doing some general research I found this could be useful:

Go here and identify your type/chassis
http://www.volvoamazonpictures.se/typeinformation/typeinformation.php

Then go here to reference your year.
http://www.volvoamazonpictures.se/modelyears/modelyears.php

This talks about the axles, mentioning “anti-spin” standard on Police models. (Note the S designation plate from 1967-on from the first link)
http://www.volvoamazonpictures.se/powertrain/powertrain.php

You can cross reference your type/chassis/year to the engine/transmission/ratio. Of note also is the change from the Spicer 27 to the Spicer 30 in late 1966. There’s lot of support for Dana 30s out there.
 

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So if one has the Dana 30 do these use the same parts as the ones in 4x4s ? Not that I'm planning to put a Detroit Locker in my wagon any time soon.
 

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So if one has the Dana 30 do these use the same parts as the ones in 4x4s ? Not that I'm planning to put a Detroit Locker in my wagon any time soon.
I'm going to say yes.

references:
http://forums.swedespeed.com/showthread.php?115505-Dana-27-or-Dana-30
and
http://www.volvoamazonpictures.se/powertrain/powertrain.php
Rear Axles said:
The American axle and driveshaft manufacturer Spicer Corp. was renamed to Dana Corp. in 1928 when the company relocated from New Jersey to Toledo, Ohio while many of the products kept the name Spicer for several decades. Spicer 27, 30, etc. are in other words identical with Dana 27, 30, etc.
I see Phil noted limited support for Dana 30s with Drum brakes in the first link above.
 

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Easy to tell if you have limited slip: jack up the rear of the car with both wheels off the ground, trans in neutral, handbrake off. No turn one of the wheels by hand. If the opposite wheel turns in the opposite direction, you have no limited slip. Same direction, you do.

The differential end of the drum brake axles have 10 splines, and no one currently makes a limited slip to fit those. Drum brake axles have 27 splines, and you can easily find a new Tru-Trac or Detroit Locker for them (Tru-Trac is better for street use -- the Locker is more of a full racing thing).
 

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Phil did you mean the disc brake rears have 27 splines?

And yes a Detroit Locker would be a bad choice a street car. Mud bogger or rock crawler maybe but I don't think too many here are into that !
 
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