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Old 10-07-2023, 02:16 PM   #1
Bunky
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Join Date: Jun 2022
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Question 4 speed Transmission interchange?

I have a Creeper gear transmission in my 67 C15 . I would like to swap that out with a Saginaw 4 speed. Can I just swap these out and keep the bellhousing,clutch assembly intact. Or is the splines different on the Saginaw?
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Old 10-08-2023, 08:17 AM   #2
cadillac_al
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Re: 4 speed Transmission interchange?

I am 98% sure the splines are the same.
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Old 10-08-2023, 08:38 AM   #3
geezer#99
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Re: 4 speed Transmission interchange?

Spline should be the same but the trans input bearing housing diameter might be different.
Info in here.


https://www.streetmusclemag.com/tech...t-bellhousing/
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Old 10-08-2023, 05:29 PM   #4
kwmech
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Re: 4 speed Transmission interchange?

Nose cone should be the same being an SM420. I would however check the bolt pattern
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