Diff identification
Thread Starter
Instructor
Joined: Feb 2007
Posts: 163
Likes: 28
From: Sweden
I found the service invoice from the diff overhaul. It was done in june -72, 20650 on the speedo, all gears, springs and plates was replaced.
3.36 was std for L46 and 3.55 perf option, right?
I measured the endplay and it is .010 and .030, is this critical?
Håkan
Tech Contributor
Joined: Aug 1999
Posts: 15,175
Likes: 3,987
From: Connecticut, USA
There were several gear ratios available, I don't know off hand what combos were set up with the various engines. Base automatics got 308, base 4 speeds got 336.
The endplay you have isn't too bad for a stock setup. You can remove the axles and check them from the face to the snap ring, should be190-200" for original axles, check the faces for hardness. The 010 is good the 030 is loose but most likely it's in the posi setup.
The endplay you have isn't too bad for a stock setup. You can remove the axles and check them from the face to the snap ring, should be190-200" for original axles, check the faces for hardness. The 010 is good the 030 is loose but most likely it's in the posi setup.
Thread Starter
Instructor
Joined: Feb 2007
Posts: 163
Likes: 28
From: Sweden
There were several gear ratios available, I don't know off hand what combos were set up with the various engines. Base automatics got 308, base 4 speeds got 336.
The endplay you have isn't too bad for a stock setup. You can remove the axles and check them from the face to the snap ring, should be190-200" for original axles, check the faces for hardness. The 010 is good the 030 is loose but most likely it's in the posi setup.
The endplay you have isn't too bad for a stock setup. You can remove the axles and check them from the face to the snap ring, should be190-200" for original axles, check the faces for hardness. The 010 is good the 030 is loose but most likely it's in the posi setup.
Tech Contributor
Joined: Aug 1999
Posts: 15,175
Likes: 3,987
From: Connecticut, USA
190-194 is better then NEW or REBUILT axles. I just built a diff that the customer has sent me new GM licensed axles. They were 184 185 and SOFT. They would have lasted about 5,000 miles before the endplay hit 030-040" and continue to wear. My point is keep your axles but I would have the face hardness checked.
You can use them in the ranges listed, they will work. To get them in the 005-007 range you will have to work on the posi and tune it better then it is. If you have it apart and want to go into tuning a posi look up my old threads. I have trained guys worldwide on tuning a posi, you might need to access a surface grinder.
You can use them in the ranges listed, they will work. To get them in the 005-007 range you will have to work on the posi and tune it better then it is. If you have it apart and want to go into tuning a posi look up my old threads. I have trained guys worldwide on tuning a posi, you might need to access a surface grinder.
