CHEVY BLAZER TRANSFER CASE IDENTIFICATION

Years Transmission Type Transfer Case Model Notes

1969-1973 Automatic NP205

1969-1974 Manual Spicer 20 NP205's also used

1973-1979 Automatic NP203

1975-1979 Manual NP205

1980-1991 All NP208

1992-1993 All NP241

GMC JIMMY TRANSFER CASE IDENTIFICATION

1970-1972 Automatic NP205

1973-1979 All NP203

1973-1974 Automatic NP205 Optional

1975-1979 Automatic NP205

1980-1991 All NP208 NP241 also used

Transfer Case Properties

NP203 full-time chain drive 2.00:1

NP205 part-time gear drive 1.96:1

NP208 part-time chain drive 2.61:1

NP241 part-time chain drive 2.72:1

Spicer 20 part-time gear drive 2.03:1

Transmission Gear Ratios

3-speed manual ('73-'80) 2.85 1.68 1.00 ----

M15 3-speed manual ('81-'84) 3.50 1.68 1.00 ----

(Opt: 2.85/3.11)

SM465 4-speed 6.55 3.58 1.70 1.00

TH350 3-speed automatic 2.52 1.52 1.00 ----

TH400 3-speed automatic 2.48 1.48 1.00 ----

700-R4 4-speed automatic 3.06 1.63 1.00 0.70 ('82-on)

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