- 1 How do I know what rear end GM I have?
- 2 How do I identify a GM 7.5 rear end?
- 3 What did the Chevy 12-bolt rear end come in?
- 4 What size is a GM 12-bolt rear end?
- 5 Is 3.42 or 3.73 better?
- 6 How much HP can a 7.5 rear end handle?
- 7 How can you tell the difference between a 7.5 and 8.8 rear end?
- 8 How much horsepower can a 10 bolt rear end handle?
- 9 Can you tell the gear ratio by the VIN number?
- 10 How strong can you make a 12-bolt rear end?
- 11 How do I know what gear ratio my 12-bolt?
- 12 How do I know if my 12-bolt is posi?
How do I know what rear end GM I have?
Information about Differentials in GM vehicles can usually be obtained by looking at the RPO or “Regular Production Option” codes contained in the Service Parts Identification tag in the glovebox. Whenever possible, reference the tag numbers when ordering parts for your Differential.
How do I identify a GM 7.5 rear end?
Although the 7.5-inch 10-bolt closely resembles the 8.5-inch housing, you can positively identify the Chevy 7.5-inch rearend by measuring it. The oval-shaped cover measures 8 5/16 inches by 10 9/16 inches. The distance between the bottom center bolt in the cover and its adjacent bolts is 3 1/4 inches.
What did the Chevy 12-bolt rear end come in?
Trucks first started using 12-bolt rearends in the 1965 G-series vans and C-series pickups. They were used until the end of production in 1987. Blazers from 1969 through 1981 also used this differential (four-wheel-drive Blazers had it installed on the rear only).
What size is a GM 12-bolt rear end?
12-Bolts to Glory The GM 12-bolt debuted in 1965 and was mass-produced until 1972. It features an 8.875-inch ring-gear carrier held in place with two internal main caps. The pinion gearshaft measures 1.625 inches in diameter and is shimmed to achieve the proper pinion depth.
Is 3.42 or 3.73 better?
The 3.42 is fine for towing smaller boats, plus you will get better gas mileage for everyday driving. If I were towing frequently on hilly roads, I might would go for the 3.73 for better gas mileage while towing, but the 3.42 should be fine with a 205.
How much HP can a 7.5 rear end handle?
7.5 rear end is a good one!! Up to around 400 HP if it was installed correctly!! You can put a girdle on it to help!!
How can you tell the difference between a 7.5 and 8.8 rear end?
The top and bottom of the 7.5-inch gasket are straight with rounded sides. The 8.8-inch gasket has flat sides, top and bottom, with rounded corners.
How much horsepower can a 10 bolt rear end handle?
Here’s what I’ve been lead to believe: 7.5” 10 bolt GM rear: It will take up to about 450 HP IF the axle tubes are welded to the housing and either a differential cover with preload bolts is installed or straps are installed over the carrier bearing caps along with longer bolts.
Can you tell the gear ratio by the VIN number?
While it may be possible to derive information about an auto’s gearbox ratio from its VIN, that depends largely on the information the manufacturer includes in the vehicle descriptor section ( VDS ) of the VIN.
How strong can you make a 12-bolt rear end?
Chances are your truck has a 12-bolt rearend, but if not, it’s fairly easy to get your hands on one. Not only are they common, but they can also be pretty solid when built correctly. In fact, they can stand up to around 800 hp, which is perfect for a street truck with some performance mods under the hood.
How do I know what gear ratio my 12-bolt?
12-bolt axles can be identified by casting numbers on the bottom of the cast-iron center-section and on the front of the passenger side axle tube. This identifies the car make and model, gear ratio, date of casting and assembly and factory of origin.
How do I know if my 12-bolt is posi?
1 This GM 12-bolt Posi unit isn’t that scary, really. It’s just a bunch of simple parts crammed into a small case. If you see springs in the window of the carrier, either coil springs like this or an S-shaped spring, it’s a Posi unit.