The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - what chevy trucks came with 12 Bolt Rear End With limited slip

raycow · 09-27-2010, 02:57 PM

Actually, the 12 bolt rear goes back to 63, but you may have to weld the spring mounts on 72 and earlier. Limited slip (posi) was an option in all of these years, but none of these trucks had it as standard. It had to be ordered and paid extra for.

The easiest way to tell would be to look at the glove box plate. Look for option G80. If the plate is missing, you will need to get one wheel off the ground. With the transmission in neutral or the driveshaft disconnected, try to turn the wheel. If it will turn easily by hand, that rear doesn't have posi.

Unfortunately, not being able to turn the wheel doesn't guarantee that the rear does have posi. For example, you could have the brake shoes frozen to the drum or serious rust inside the rear. However, these are the ones you should consider taking off the cover so you can look inside.

Ray

09-27-2010, 02:57 PM	#2
raycow Registered User Join Date: Mar 2003 Location: San Francisco, CA USA Posts: 2,454	Re: what chevy trucks came with 12 Bolt Rear End With limited slip Actually, the 12 bolt rear goes back to 63, but you may have to weld the spring mounts on 72 and earlier. Limited slip (posi) was an option in all of these years, but none of these trucks had it as standard. It had to be ordered and paid extra for. The easiest way to tell would be to look at the glove box plate. Look for option G80. If the plate is missing, you will need to get one wheel off the ground. With the transmission in neutral or the driveshaft disconnected, try to turn the wheel. If it will turn easily by hand, that rear doesn't have posi. Unfortunately, not being able to turn the wheel doesn't guarantee that the rear does have posi. For example, you could have the brake shoes frozen to the drum or serious rust inside the rear. However, these are the ones you should consider taking off the cover so you can look inside. Ray Last edited by raycow; 09-27-2010 at 03:02 PM.