10 Bolt Ratios ?

[USA-69Z]

Hi Guys , is there any markings on a 10 bolt diff to tell what ratio you have ?
Or you gotta do the mark it and count rotations thing?
Cheers, Gav

[Nev68]

Hi Guys , is there any markings on a 10 bolt diff to tell what ratio you have ?
Or you gotta do the mark it and count rotations thing?
Cheers, Gav

Gav,
See if this helps (providing the diff hasn't been altered since production)
It's from camaro.org and helped me figure out mine is good for salt lake racing. (2.56 ratio should be good for 300mph:rolleyes: )

http://i337.photobucket.com/albums/n387/nev68/rearaxlestamp.gif

1968
Code Ratio Size Type Brake
BA 2.56 10 N
BB 2.56 10 P
BC 3.36 10 N
BD 3.36 10 P
BE 2.56 12 N
BF 2.56 ? N
BG 2.56 12 P
BH 2.56 ? P
BI 2.73 12 N
BJ 3.07 12 N
BK 2.73 10 N
BL 3.07 12 N
BM 3.31 12 N
BN 3.55 12 N
BO 3.73 12 N
BP 2.73 10 N
BQ 2.73 12 P
BR 3.07 12 P
BS 3.31 12 P
BT 3.55 12 P
BU 3.73 12 P
BV 4.1 12 P
BW 4.56 12 P
BX 4.88 12 P
BY 2.73 12 P
BZ 2.73 12 N
PA 3.08 10 N
PB 3.31 12 N
PC 3.31 12 N
PD 3.31 12 P
PE 3.08 10 P
PF 3.31 12 P
PG 3.07 12 P
PH 3.55 10 P
PI 3.55 12 P
PJ 3.73 12 P
PK [1] 3.55 10 N
PL 3.55 10 N
PM 3.73 12 N
PN 2.56 12 N
PO 2.56 12 P MET
PP 3.07 12 N
PQ
PR 3.31 12 P
PS 3.55 12 P
PT 3.73 12 N
PU 3.73 12 P
PV
PW
PX 2.73 10 P
PY 2.56 12 N
PZ 2.56 12 P
QA 4.1 12 P
QB 4.56 12 P
QC 4.88 12 P
QD 4.1 12 P
QE 3.55 ? ?
QF 4.1 12 P
QG 4.56 12 P
QH 4.88 12 P
QI 2.73 12 P
QJ 3.07 12 P
QK 3.31 12 P
QL 3.31 12 N
QM 4.88 12 P
QN 4.88 12 P 4WD
QO 3.07 12 N
QP 3.07 12 P
QQ 3.31 12 N
QR 3.31 12 P
QS 2.56 ? P 4WD
QT [2] 2.73 10 N 4WD
QU 3.07 12 P 4WD
QV 3.31 12 N 4WD
QW 3.55 12 P 4WD
QX 3.73 12 N 4WD
QY 4.1 12 P 4WD
QZ 4.56 12 P 4WD



Table legend
10 - 10 bolt axle, 8.125 in. diameter ring gear.
12 - 12 bolt axle, 8.875 in. diameter ring gear.
P - Positraction.
N - Non-Positraction.
STD - Standard brakes.
MET - Metallic brakes.