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Post Info TOPIC: Turbo 350 transmission question?


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Turbo 350 transmission question?

Did GM have multiple different governors for different vehicles and rear end ratios?

Im thinking they would but Im not finding much about it on the net which seems a little Wierd??

Im thinking a Corvette governor MUST be different than one for an RV or truck?

Just looking for insight from someone in the know trying to learn more about the hobby 



67 Parisienne Convertible 

67 Parisienne 2 Door Hardtop 

Poncho Master!

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I am sure that there were different governors available depending on the engine and axle ratio. The turbo 400 definitely had different governors. The 400 had a habit of stripping the teeth off of the plastic gear and I used to frequent the auto wrecker near me and would grab a used one from a core transmission. One time I did get one that changed the shift points to a slightly higher road speed. I wouldnt have noticed except it was my own truck and I felt the difference.




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in those years different axle ratios didn't change the transmission (except speedo gear of course) itself but different versions of a transmission would be used depending on which engine was used or which specific model car it was going into. For example on a 69 GTO there were 3 different versions of the auto trans option (TH400 but same concept with TH350), the differences being in the governor, torque converter and clutches etc: the standard engine used one version, the Ram Air engines (3 and 4) used a different version with tighter shifting feel and the optional 2 bbl engine version shifted earlier to reflect the lower power band of the engine.

The way to get a sense if they varied is by transmission pick codes being used in a given car, to know for sure you need an MPC to study the part numbers of each component. If auto transmissions have the same 2 letter pick code in a given year then the internal components will all be the same.




16 1969 American Pontiacs

and a 1969 Canadian 2+2 Hardtop

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