Saginaw gear ratios

[DoubleV]

What are the gear ratios of the Saginaw 4 speeds that came in the 78-80 gbody's? Yes, I've seen the info on the different Saginaw ratios determined by the number of grooves the input shaft has but which one ( ones? ) came specifically in the Gbody's?

 

[kalidromos13]

The Saginaws that came with 78-80 A-Bodies with a 305 V8 was the no groove 2.85 first gear with 2.73 rear gears. That's what it says in the '78 service manual. V6's got a different trans. I believe some were 3.5 first gear 3 speeds.

 

[KYMalibu]

What are the gear ratios of the Saginaw 4 speeds that came in the 78-80 gbody's? Yes, I've seen the info on the different Saginaw ratios determined by the number of grooves the input shaft has but which one ( ones? ) came specifically in the Gbody's?

Here are the gear ratios available:
Saginaw 4 speed
1st 2nd 3rd 4th
3.50-2.48-1.65-1.00
3.11-2.20-1.47-1.00
2.85-2.01-1.47-1.00
2.54-1.80-1.44-1.00

 

[KYMalibu]

Here are the gear ratios available:
Saginaw 4 speed
1st 2nd 3rd 4th
3.50-2.48-1.65-1.00
3.11-2.20-1.47-1.00
2.85-2.01-1.47-1.00
2.54-1.80-1.44-1.00

The 3.50 1 st gear was Monza/Vega

 

[KYMalibu]

The 3.50 1 st gear was Monza/Vega

Mine has 2 grooves which is the 3.11. It may have been switched out through the years though.

 

[DoubleV]

Cool thanks. Friend of mine might by a gbody with factory Saginaw and wants to keep it pretty much original but thought perhaps if you can swap in a steeper geared Saginaw that would help give it a bit more kick.

 

[KYMalibu]

Cool thanks. Friend of mine might by a gbody with factory Saginaw and wants to keep it pretty much original but thought perhaps if you can swap in a steeper geared Saginaw that would help give it a bit more kick.

Oh yeah , the Saginaw 3 and 4 speed will bolt right up. The difference will be the shifter . The Monza / Vega has a torque tube which will require a different shifter set up.

 

[KYMalibu]

Oh yeah , the Saginaw 3 and 4 speed will bolt right up. The difference will be the shifter . The Monza / Vega has a torque tube which will require a different shifter set up.

I may have a 3.11 (2groove) in the shed , brother. Always good to keep a spare . With these.

 

[pagrunt]

The 3.50 1 st gear was Monza/Vega

All my Vega Saginaws I picked up were 3.11 1st.

Oh yeah , the Saginaw 3 and 4 speed will bolt right up. The difference will be the shifter . The Monza / Vega has a torque tube which will require a different shifter set up.

The tail housings has the 3 side mount holes for the shifter like the non torque tube tails. If I remember right, the '82-'84 F cars used the same type tail.

 

[kalidromos13]

Here is some info for the 78 Monte Carlo transmissions and what was available for that year, looks like v6 models got 3.5 first gear 3 and 4 speeds.