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> 5S motor vs 7A transmission
post Jan 4, 2018 - 12:34 AM
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Natecelica

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Hello friends! Quick question. I've looked for in forms for a while and cannot find any information on a 7a manual transmission being fitted to a 5s engine. I currently have a 98 gt 2.2 5S-FE automatic and have oppertunity to purchase a 94 st 7A-FE 1.8 manual. I've been wanting to change the automatic to a manual and was wondering if the transmission from the 7A will bolt to the 5S block? Thank you smile.gif
post Jan 4, 2018 - 12:05 PM
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slavie

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It may bolt up, but it's not worth the trouble - you'll need to change the CV axles, figure out what to do with the intermediate shaft bearing that's on the 5S but not on 7A, possibly other issues.

On top of that, I'm not certain that the transmission is in the same place when bolted to the engine as with 7A, so you may have to get some sort of custom CV axle length to make it work.

Find yourself an S54 transmission. Even the S51 from a Camry/Solara (taller gears, lower final drive ratio) is better than trying to make the C-series box from 7A work.
post Jan 4, 2018 - 1:34 PM
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Bitter

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No. A engines use C transmissions, S engines use E or S transmissions


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post Jan 4, 2018 - 3:05 PM
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Natecelica

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QUOTE (slavie @ Jan 4, 2018 - 12:05 PM) *
It may bolt up, but it's not worth the trouble - you'll need to change the CV axles, figure out what to do with the intermediate shaft bearing that's on the 5S but not on 7A, possibly other issues.

On top of that, I'm not certain that the transmission is in the same place when bolted to the engine as with 7A, so you may have to get some sort of custom CV axle length to make it work.

Find yourself an S54 transmission. Even the S51 from a Camry/Solara (taller gears, lower final drive ratio) is better than trying to make the C-series box from 7A work.


Thank you. Iíll have to look into junk yards around then.
post Jan 4, 2018 - 3:05 PM
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Natecelica

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QUOTE (Bitter @ Jan 4, 2018 - 1:34 PM) *
No. A engines use C transmissions, S engines use E or S transmissions


Awesome. Thatís extremely helpful thank you!
post Jan 4, 2018 - 3:16 PM
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Box



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Yup, need a S series trans. S54 is what the car would've had originally if it were a factory manual.


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1996 Pontiac Firebird Formula hardtop 6-speed

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