Saginaw 4-Speed Differences?

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Saginaw 4-Speed Differences?

Postby fas141 » Sat Nov 20, 2021 11:30 am

Does anyone know if a Saginaw 4-speed from a 4cyl Monza is the same as a Saginaw 4-Speed from a V8 Monza. Did GM use the same transmission regardless of which engine got used? Thanks.
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Re: Saginaw 4-Speed Differences?

Postby monzaaddict » Sat Nov 20, 2021 12:35 pm

different ratios same case
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Re: Saginaw 4-Speed Differences?

Postby cjbiagi » Sat Nov 20, 2021 4:39 pm

Saginaws had 4 different ratios, so it just depended upon the engine and rear gear ratio.
Saginaw 4-speed 1st 2nd 3rd 4th
Saginaw 4-speed – 1 Line 2.54 1.80 1.44 1.00
Saginaw 4-speed – 2 Lines 3.11 2.20 1.47 1.00
Saginaw 4-speed – 3 Lines 3.50 2.47 1.65 1.00
Saginaw 4-speed – No lines 2.84 2.01 1.35 1.00
Clyde.........75 Monza 2+2
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Re: Saginaw 4-Speed Differences?

Postby 74_Vega_GT » Sat Nov 20, 2021 8:08 pm

~ Great post..scary answers for me, now I wonder which Saginaw I have mated to the Cosw.3:73 rear..Can we assume that all Cosworths had the same 4 sp? Thanks in advance.
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Re: Saginaw 4-Speed Differences?

Postby HI WINDING MONZA » Sun Nov 21, 2021 7:59 am

I know my 80 Monza 151 had the 3.50 first gear Saginaw with a 2.73 rear gear.

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Re: Saginaw 4-Speed Differences?

Postby cosvega76 » Sun Nov 21, 2021 9:46 am

In most cases, the CV used the 3.11 first gear trans.

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Re: Saginaw 4-Speed Differences?

Postby fas141 » Mon Nov 22, 2021 6:36 am

Strength wise do you think there is a difference between a Saginaw from a 4cyl vs a V8?
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Re: Saginaw 4-Speed Differences?

Postby cosvega76 » Mon Nov 22, 2021 9:22 am

Yes. The larger numerically the first gear ratio, the weaker the trans. You can put a 3.11 trans behind a V8 if you're really nice to it. It won't take as much abuse.

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