The ring gear diameter
is measured across the face of the gear
. To obtain the ring gear diameter, simply place a tape measurer across the gear. This can be tricky if the ring gear & carrier are still in the housing. In some cases, a differential can be identified by the number of cover bolts is has.
How do I know my Chevy ring gear size?
The ring gear diameter
is measured across the face of the gear
. To obtain the ring gear diameter, simply place a tape measurer across the gear. This can be tricky if the ring gear & carrier are still in the housing. In some cases, a differential can be identified by the number of cover bolts is has.
How do I identify my GM differential?
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 find my GM gear ratio?
Count the teeth on the small gear in the forward part of the axle housing, called the pinion gear. Count the number of the teeth in the big ring gear attached to the differential.
Divide the number of teeth on the pinion into the number of teeth on the ring gear
. This is the gear ratio.
What size ring gear is in a GM 12 Bolt?
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.
How do I know my ring gear ratio?
Count the number of teeth on the pinion gear and count the number of teeth on the ring gear.
Divide the ring gear teeth number by the number of teeth on the pinion
. The result is your gear ratio. Note: you may need to round off the number.
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 do I identify my differential?
Visual Differential Identification
Without an ID tag, differentials are identified by
the number of cover bolts
, the distinctive shape of the cover, the number of ring gear bolts, and ring gear diameter. They can also be identified by whether the center section is an integral or dropout design.
How do I identify my 8.5 gm rear end?
When looking at the housing from the rear, an
8.5 will have two squared off chunks of casting hanging on each side near the bottom of the differential
. An 8.2 (shown) will have the same contour as the cover. Most 8.2 factory covers also have the strange protrusion at the top.
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.
Is 3.08 a good gear ratio for towing?
Yes, you are exactly right,
towing with a 6 speed with 3.08s is still better than towing with a 4 speed
and 3.73s. If its a heavy trailer, you will probably never use 5th and 6th gears, but who cares? crank turns to rotate the rear wheels once that counts.
Where do I find my GM suspension code?
This sticker is always found
on the inside of the glove box door
. You can see the codes are in numerical order and that this vehicle came equipped with the Z55 Autoride suspension.
How do you narrow a GM 10 Bolt?
USA. Dave, You can narrow a 10 bolt by
getting a donor rear (8 3/4 Mopar works good)
and narrow the donor axles and put the chevy spline on the end. Then use the donor axle housing ends, brakes, etc and you have a much stronger rear and bigger brakes.
How can you tell a 12 bolt posi?
The easiest way to identify a 12-bolt rearend is obviously by the
12 bolts holding the rear cover onto the axle housing
. The pinion shaft on passenger-car differentials is 1-5/8-inch in diameter and the cover is oval, measuring 10-15/16-inches wide by 10-5/8-inches tall.
What size ring gear does a Dana 60 have?
The Dana 60’s ring gear is
9.75 inches in diameter
, and the available gear spread ranges from 3.31:1 to 7.17:1.
