Saginaw 4 speed choice - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dave3156 · 09-04-2007, 07:01 PM

My Saginaw 3 speed is having problems and I thought if I am going to pull it I would replace it with a 4 speed transmission. From reading other posts, It appears to be a direct bolt up. What issues will I face? I would guess i need different linkage. Also which of the Saginaw 4 speeds should I look for? The following are the gear ratios they were made with:

Saginaw 4-speed 1st 2nd 3rd 4th
No lines 2.84 2.01 1.35 1.00
1 Line 2.54 1.80 1.44 1.00
2 Lines 3.11 2.20 1.47 1.00
3 Lines 3.50 2.47 1.65 1.00

My rearend gears are 3:73. The engine is a slightly modified 350 (Edelbrock 1406, Performer RPM, headers, dual exhaust) Which of these ratios would work the best?

09-04-2007, 07:01 PM	#1
dave3156 Registered User Join Date: Mar 2004 Location: St. Louis, MO Posts: 336	Saginaw 4 speed choice My Saginaw 3 speed is having problems and I thought if I am going to pull it I would replace it with a 4 speed transmission. From reading other posts, It appears to be a direct bolt up. What issues will I face? I would guess i need different linkage. Also which of the Saginaw 4 speeds should I look for? The following are the gear ratios they were made with: Saginaw 4-speed 1st 2nd 3rd 4th No lines 2.84 2.01 1.35 1.00 1 Line 2.54 1.80 1.44 1.00 2 Lines 3.11 2.20 1.47 1.00 3 Lines 3.50 2.47 1.65 1.00 My rearend gears are 3:73. The engine is a slightly modified 350 (Edelbrock 1406, Performer RPM, headers, dual exhaust) Which of these ratios would work the best?

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