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| F23 final gear swap question (Page 1/2) |
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Miked0002
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OCT 02, 08:19 PM
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I got the 02 cavalier f23 to use with the 3800sc. I read a lot about the gearing not being great for this swap so I bought the 09 cobalt trans to swap the final gear into the cavalier trans. The cobalt final gear is smaller so it's not meshing with the other gear the same. My question is what else do I need out of the cobalt trans to swap into the cavalier trans? Thanks in advance
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Will
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OCT 04, 08:56 AM
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You have to install the bellhousing from the '02 Cavalier transmission on the Cobalt transmission.
The final *ratio* comes from the pinion gear on the output shaft and the ring gear on the differential.
The '02 Cavalier trans has a 3.94 final ratio. The XFE Cobalt trans has a 3.63 final ratio.
As you found, you can not use the ring gear from the 3.63 with the pinion from the 3.94.
Did your transmission come from the Cobalt XFE model? That trans has the 3.63 final drive.
Also, the Cobalt input shaft is longer than the Cavalier input shaft, so you'll have to do some work on the input shaft so that it doesn't interfere with the 3800 crank snout.
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cam-a-lot
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OCT 04, 09:32 AM
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Has anyone done a write-up on the gear swap?
I have the 3.63 ratio in my F23 and I can tell you it is WAY better for the 3800 than the standard cavalier gearing. I notice a big difference. (I had a previous car with an F23 with cavalier gearing)
It would be awesome if someone could document the gearing swap for others to use as a template. I bought mine already swapped, so I have no real info to offer unfortunately.[This message has been edited by cam-a-lot (edited 10-04-2022).]
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Will
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OCT 04, 11:17 AM
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Miked0002
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OCT 04, 02:31 PM
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Yes, I bought the trans from the xfe cobalt. It looks like the pinion gear (or whatever the gear is that turns the ring gear) is the same on both transmissions. If that's true, what determines how close or far the gears are? Would the bearing races on the case be different to move the gearing?
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ericjon262
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OCT 05, 08:13 PM
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| quote | Originally posted by Miked0002:
Yes, I bought the trans from the xfe cobalt. It looks like the pinion gear (or whatever the gear is that turns the ring gear) is the same on both transmissions. If that's true, what determines how close or far the gears are? Would the bearing races on the case be different to move the gearing? |
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the bellhousing can bee swapped between transmissions, because the bellhousing also carries one of the differential bearings, they must be in the same place on each transmission, which means both the pinion and the final drive need to have changed.
as Will said, you either need to swap the bellhousing, or transfer the entire gearset into the cavalier case. My car has a 3.63 gearset with a cavalier bellhousing. ------------------
"I am not what you so glibly call to be a civilized man. I have broken with society for reasons which I alone am able to appreciate. I am therefore not subject to it's stupid laws, and I ask you to never allude to them in my presence again."
I invited Lou Dias to trash me in my own thread, he refused. sorry. if he trashes your thread going after me. I tried.
No pushrod 60V6 Fiero has been faster according to the 1/4 mile list.
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Miked0002
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OCT 06, 10:24 PM
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I decided to go with swapping the entire gear set over to the cavalier cases. Thank you all for your help!!
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Miked0002
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OCT 06, 10:28 PM
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Oh, one more thing. Can I swap all the gears but use the cavalier input shaft?
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ericjon262
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OCT 06, 11:36 PM
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me personally, I would keep all the gearsets together, I'm unsure if they're the same outside of the length difference. ------------------
"I am not what you so glibly call to be a civilized man. I have broken with society for reasons which I alone am able to appreciate. I am therefore not subject to it's stupid laws, and I ask you to never allude to them in my presence again."
I invited Lou Dias to trash me in my own thread, he refused. sorry. if he trashes your thread going after me. I tried.
No pushrod 60V6 Fiero has been faster according to the 1/4 mile list.
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Miked0002
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OCT 07, 01:07 AM
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