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Manual Three-Speed Transmission - (Group 4.000)

The manual three-speed transmission was standard fare for most of the Chevelle lineup from 1964 thru 1972. Some exceptions include the 1970 with either the SS 396 or SS 454, the 1971 and 1972 SS with the 454 engine where the H.D. Muncie 4-speed or TH400 were the only transmission options available.

Like the Powerglide two-speed automatic, the three-speed manual transmissions cam in many flavors depending on the engine it was installed with. The H.D. Muncie three-speed manual transmission was the base transmission for the 1966 through 1968 SS 396 series and the SS 396 option in 1969 while the Saginaw three-speed transmission was the base transmission in 6-cylidner and small-block V8 Chevelles.

To see just what three-speed manual transmissions were used behind which specific 6- and 8-cylinder engines, see my Chevelle Facts Guide CD.

Manual 3-speed identification:

Model Year	Description	Main case	Extension Housing	Side Cover
1964	Saginaw (Low Performance Engine) Saginaw Saginaw with Overdrive	3834197 3834197 3837552	3790570 3790570 unknown⁽²⁾	3849534 3849534 3949534
1965	Saginaw (Low Performance Engine) Saginaw Saginaw with Overdrive	3854726 3864740 or 3854726 3837562	3855722 3855722 unknown⁽²⁾	3894534 3894534 3894534
1966	Saginaw (Low Performance Engine) Saginaw Saginaw with Overdrive Borg-Warner Heavy Duty M13	3858986 3858986 3873985 T16-1	3860042 3881854 unknown⁽²⁾ T16-7A	3858992 3858992 3858992 T16-148
1967	Saginaw (Low Performance Engine) Saginaw Saginaw with Overdrive Borg-Warner Heavy Duty M13	3858986 3858986 3873895 T16-1	3860042 3860042 unknown⁽²⁾ T16-7A	3858992 3919365 3858992 T16-148
1968	Saginaw Muncie with Overdrive Borg-Warner Heavy Duty M13	3925647 3875895 T16-1	3860042 unknown⁽²⁾ T16-7A	3919365 3858992 T16-148
1969	Saginaw Heavy Duty Muncie MC1	3925647 3911940	3860042 3911942	3919365 3911947
1970	Saginaw Heavy Duty Muncie	3925647 3911940	3860042 3911942	3852645 3911947
1971	Saginaw (Low Performance Engine) Saginaw Heavy Duty Muncie⁽¹⁾	3925647 3925647 3911940	3873886 3873886 3911942	3952645 3952645 3952646
1972	Saginaw Heavy Duty Muncie⁽¹⁾	3925647 3911940	3873886 3911942	3952645 3952646
1973	Saginaw (Low Performance Engine) Saginaw	3925647 3925647	3873886 326558	3952645 3952645
1974	Saginaw (Low Performance Engine) Saginaw	3925647 3925647	3873886 326558	3952645 3952645
1975	Saginaw (Low Performance Engine) Saginaw	3925647 3925647	326558 326558	3952645 3952645

⁽¹⁾ Only used in 1971-1972 and only with the LS3 402/300hp engine.
⁽²⁾ Overdrive Unit Casting Number

Standard Borg Warner H.D. three-speed from 1966 SS 396.

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Manual Three-Speed Transmission - (Group 4.000)

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