lsd rear end whats best options??

[harry]

hi guys,
what do you think is the best thing to do regarding lsd diff for my 63,i want to keep the 6 lug because i dont want to change wheels and i have just got 6 lug disk brake and drop spindles setup for the front.Does the truck lsd for my 63 diff handle much abuse??adapt 9inch or 12 bolt car diff??redrill car axles to 6lug??? Is there a later model 6 lug lsd truck diff i can use??

[LAFNATU]

Maybe this is common knowledge to most people, but could you tell me what a lsd rear end is? Thanks

[harry]

Originally Posted by LAFNATU

Maybe this is common knowledge to most people, but could you tell me what a lsd rear end is? Thanks

Limited
Slip
Differential

[rodnok1]

me thinks he means limited slip diff...
If I remember correctly these trucks(64+) have a 8.75 12 bolt truck diff, plenty heavy duty. These were the same through early 70's but they get wider in the 70's. Since you want to keep the 6 lug pattern I would just beaf it up some if you're worried apart breaking old parts. I run an Auburn posi myself with new moser axles(they were worn at seals and one had bad splines).

[shade67]

Originally Posted by harry

hi guys,
what do you think is the best thing to do regarding lsd diff for my 63,i want to keep the 6 lug because i dont want to change wheels and i have just got 6 lug disk brake and drop spindles setup for the front.Does the truck lsd for my 63 diff handle much abuse??adapt 9inch or 12 bolt car diff??redrill car axles to 6lug??? Is there a later model 6 lug lsd truck diff i can use??

I would say it's lived this long, and if its not leaking leave it well enough alone! usually limited slip diffs are a better quality unit to begin with.

If it breaks then look for a rear diff from a 1/2ton 73-87 chevy 4x4 pickup or 73-91 blazer/suburban then cut off the mounts on both diffs and weld the 63 mounts to the newer diff.

[harry]

Originally Posted by shade67

I would say it's lived this long, and if its not leaking leave it well enough alone! usually limited slip diffs are a better quality unit to begin with.

If it breaks then look for a rear diff from a 1/2ton 73-87 chevy 4x4 pickup or 73-91 blazer/suburban then cut off the mounts on both diffs and weld the 63 mounts to the newer diff.

the ones you mention are they 6 lug axles

[LAFNATU]

O.I.C, I got a rearend out of a 67, for my 62, I imagine it is a lsd also. It is a 6 lug pattern, I too wanted to keep the original look....

[jdboy]

This is the one I'm looking at for my truck. Fits original axle 30 spline 12 bolt truck rearend.

http://store.summitracing.com/partde...5&autoview=sku

[shade67]

Originally Posted by harry

the ones you mention are they 6 lug axles

Yes, they are, but they are a little wider. I have the 2wd version w/5 lug wheels in my 66 stepside and the slight extra width isn't noticeable.

[harry]

problem solved,i found a diff shop today that has a lsd carrier that he will set up for me and he will check out axles to make sure they are ok as well.

[Captainfab]

The axles in your '63 are going to have a coarse spline on them....17 spline IIRC. So a lsd for a 30 spline '65-'79 pickup 12 bolt isn't going to work without changing the axles to a 30 spline pair.

There were posi units for the coarse spline axles. IIRC they were made by Dana and had really stiff springs in them....I rebuilt one many years ago. I have 2 or 3 of these in projects & parts trucks....I don't think you can get parts for them anymore though.

[harry]

Originally Posted by Captainfab

The axles in your '63 are going to have a coarse spline on them....17 spline IIRC. So a lsd for a 30 spline '65-'79 pickup 12 bolt isn't going to work without changing the axles to a 30 spline pair.

There were posi units for the coarse spline axles. IIRC they were made by Dana and had really stiff springs in them....I rebuilt one many years ago. I have 2 or 3 of these in projects & parts trucks....I don't think you can get parts for them anymore though.

thanks captain will check that out,cheers