 5S motor vs 7A transmission |
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 Jan 4, 2018 - 12:34 AM
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Enthusiast Joined Oct 11, '16 From 6celica Currently Offline Reputation: 0 (0%)  |
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
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Jan 4, 2018 - 12:05 PM
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Enthusiast  Joined May 2, '15 From NY Currently Offline Reputation: 3 (100%) |
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. |
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Jan 4, 2018 - 1:34 PM
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Enthusiast Joined Mar 11, '06 From Way South Chicago Currently Offline Reputation: 0 (0%) |
No. A engines use C transmissions, S engines use E or S transmissions
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Jan 4, 2018 - 3:05 PM
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Enthusiast Joined Oct 11, '16 From 6celica Currently Offline Reputation: 0 (0%) |
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. I’ll have to look into junk yards around then. |
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Jan 4, 2018 - 3:05 PM
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Enthusiast Joined Oct 11, '16 From 6celica Currently Offline Reputation: 0 (0%) |
QUOTE (Bitter @ Jan 4, 2018 - 1:34 PM) No. A engines use C transmissions, S engines use E or S transmissions Awesome. That’s extremely helpful thank you! |
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Jan 4, 2018 - 3:16 PM
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 Enthusiast Joined Feb 23, '12 From Warrior, AL Currently Offline Reputation: 0 (0%) |
Yup, need a S series trans. S54 is what the car would've had originally if it were a factory manual.
-------------------- 2001 Miata LS 5-speed
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