dingo77
Well-Known Member
ok so i just got an 8.75 a couple days ago and am wanting to know a lil more info on what the numbers stamped on the housing of the chunk are telling me. the number is 2070741. thanks guys and gals.
8.75 decode
- Thread starter dingo77
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7demon2
Registered User #1824
well it is an 8 3/4 that is for sure. the 741 numbers mean it is the weakest of the 8 3/4 rears. i copied this to help you understand the numbers. hope it helps!
2070741 AKA "741" :
The 741 is the weakest 8 ¾ center section you can buy. Commonly found in V8 A bodies before 1973. The 741, besides being the weakest of the 8 ¾, has a limited amount of OEM and aftermarket bearings, gears, and other parts available. This unit when found in an A body rear is usually loaded with highway gears. A lot of people on the webboards hack on the 741 that it is too weak but most agree that it is hard to break it in a mild street application. So if you have a nice strong small block street car you will be hard pressed to bust this pumpkin. Sure grips found in these rears can be swapped into other housings as long as you take the carrier bearing and races with you (as they are different). SG's themselves are all the same except for the clutch and cone type units.
Info: 1 3/8 Pinion
2070742 AKA "742":
A real good section with lots of bearing/gears/parts available. Biggest gear ratio available 5.57. It doesn't use a crush sleeve like the later 489 so a lot of racers prefer it. If you find one with an original sure grip it is almost 99% odds in favor it is a sweet clutch type. More on this later.
Info: 1 ¾ Pinion
2881489 AKA "489":
The strongest of the 8 ¾ units. As with the 742 there are tons of replacement parts available as well as gear ratios. Gear ratios available beyond 3.23 are: 3.55, 3.91, 4.10, 4.30, 4.57, 4.86, 5.13 and 5.38. Almost all original sure grips, except 1969, found in this housing are the non rebuildable and less desirable cone type. Also with suregrips there is a bit of noise on the net as which are better. The clutch type are rebuildable and the best for racing. The cone type are not rebuildable but are perfectly acceptable for a street car.
2070741 AKA "741" :
The 741 is the weakest 8 ¾ center section you can buy. Commonly found in V8 A bodies before 1973. The 741, besides being the weakest of the 8 ¾, has a limited amount of OEM and aftermarket bearings, gears, and other parts available. This unit when found in an A body rear is usually loaded with highway gears. A lot of people on the webboards hack on the 741 that it is too weak but most agree that it is hard to break it in a mild street application. So if you have a nice strong small block street car you will be hard pressed to bust this pumpkin. Sure grips found in these rears can be swapped into other housings as long as you take the carrier bearing and races with you (as they are different). SG's themselves are all the same except for the clutch and cone type units.
Info: 1 3/8 Pinion
2070742 AKA "742":
A real good section with lots of bearing/gears/parts available. Biggest gear ratio available 5.57. It doesn't use a crush sleeve like the later 489 so a lot of racers prefer it. If you find one with an original sure grip it is almost 99% odds in favor it is a sweet clutch type. More on this later.
Info: 1 ¾ Pinion
2881489 AKA "489":
The strongest of the 8 ¾ units. As with the 742 there are tons of replacement parts available as well as gear ratios. Gear ratios available beyond 3.23 are: 3.55, 3.91, 4.10, 4.30, 4.57, 4.86, 5.13 and 5.38. Almost all original sure grips, except 1969, found in this housing are the non rebuildable and less desirable cone type. Also with suregrips there is a bit of noise on the net as which are better. The clutch type are rebuildable and the best for racing. The cone type are not rebuildable but are perfectly acceptable for a street car.
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