I'm confused, what is a carrier? What is the difference between series 2, 3 . . . .

What years had what rearends? Axles?

------------------
1985 Camaro IROC-Z LB9

1989 Pontiac Firebird
Formula W6S LO3 TBI 305
-180 degree stat
-Hooker Cat-Back

 

the carrier is the "thing" the ring gear bolts to. i believe thirdgens used 26 spline axles before 88 in 88 they went to 28 spline axles. i believe the 2 series carrier is for 3:08 and numerically lower ratios and the 3 series is for 3:23 and numerically higher ratios.

------------------
ICON Motorsports
1st & 3rd

 

The reason they use different carriers is because when going to lower gear ratios, the size of the teeth change. Instead of having a really thick gear to keep the ring teeth closer to the pinion, they created a different carrier that moves the whole ring gear closer. 2 and 3 series carriers are the most common. Our little 7.5 diffs don't have a 4 series but diffs like a 12 bolt have a 4 series carrier for 3.90 to 6.14 gears

------------------
Stephen's racing page

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
454 Big Block buildup now in progress for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

 

That is another queston of mine. Who has 7.5's and who has 7 5/8's? Which is better, I'm guessing 7 5/8?