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F23 trans swap? by fierogt28
Started on: 06-30-2020 12:29 AM
Replies: 16 (247 views)
Last post by: Raydar on 07-10-2020 01:56 PM
fierogt28
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Report this Post06-30-2020 12:29 AM Click Here to See the Profile for fierogt28Click Here to Email fierogt28Send a Private Message to fierogt28Edit/Delete MessageReply w/QuoteDirect Link to This Post
Those that are installing F23 trans swaps, are you choosing the 3.84 ratio unit?

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Report this Post06-30-2020 01:01 AM Click Here to See the Profile for ericjon262Send a Private Message to ericjon262Edit/Delete MessageReply w/QuoteDirect Link to This Post
you have ti with the metric bell housing, unless you're like me and a handful of others who swapped the metric bell onto the ecotec 3.63 gearset case.

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Report this Post07-02-2020 09:36 AM Click Here to See the Profile for WillClick Here to Email WillSend a Private Message to WillEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by fierogt28:

Those that are installing F23 trans swaps, are you choosing the 3.84 ratio unit?




The "metric" bellhousing F23 has a 3.94 ratio.
The Ecotec trans that followed has a 3.82 ratio.
The early Cobalt XFE transmission has a 3.73ish ratio.
The late Cobalt XFE trans has a 3.63 ratio.

Whether you keep the 3.94 or not would be a matter of preference for how you drive and your engine's powerband and torque delivery.
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fierogt28
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Report this Post07-07-2020 10:48 PM Click Here to See the Profile for fierogt28Click Here to Email fierogt28Send a Private Message to fierogt28Edit/Delete MessageReply w/QuoteDirect Link to This Post
If we are talking about a 3800 S/C swap...ideal trans ratio would be? (most common)

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Report this Post07-07-2020 11:29 PM Click Here to See the Profile for pmbrunelleClick Here to Email pmbrunelleSend a Private Message to pmbrunelleEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by fierogt28:
ideal trans ratio would be? (most common)


That's like asking the forum what clothes you should wear, what food you should eat, or what car you should drive.

Personal preference.

Edit to add a slightly less cryptic answer:
Use what you have now (2.8/Getrag) in conjunction with your imagination to help you pick ratios.

If you had the Getrag you have now, would you like the same gearing but with an engine having 70% more torque?
Are you happy with 1st gear today? How about with more torque?
Are you happy with 2nd gear today? How about with more torque?
Are you happy with 3rd gear today? How about with more torque?
Are you happy with 4th gear today? How about with more torque?
Are you happy with 5th gear today? How about with more torque?

If you like the existing gearing, keep the Getrag (possibly with a rebuild), or get something with similar ratios.

If you don't think you like your current gearing, then imagine if you would like each gear(1-2-3-4-5-(6)) to be shorter or taller. Then, find the gearbox that most closely matches your desires.

[This message has been edited by pmbrunelle (edited 07-07-2020).]

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cam-a-lot
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Report this Post07-08-2020 07:36 AM Click Here to See the Profile for cam-a-lotSend a Private Message to cam-a-lotEdit/Delete MessageReply w/QuoteDirect Link to This Post
I had an F23 with the 3.94 ratio and 3800 SC motor. Loved the tranny, hated the gearing. For that engine, I found the shifts to be far too short.

I like the stock Getrag gearing with the 3800 SC much more, but am concerned about the longevity and availability of parts for the 30+ year old Getrag, so if I do go ahead with an F23, I will be going with the 3.63 gear set.
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Report this Post07-08-2020 10:58 AM Click Here to See the Profile for La fieraSend a Private Message to La fieraEdit/Delete MessageReply w/QuoteDirect Link to This Post
I have the Metric 3.94 and it fits my engine's powerband very well, I'm very happy with it.
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fierogt28
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Report this Post07-08-2020 11:18 PM Click Here to See the Profile for fierogt28Click Here to Email fierogt28Send a Private Message to fierogt28Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by pmbrunelle:


That's like asking the forum what clothes you should wear, what food you should eat, or what car you should drive.

Personal preference.

Edit to add a slightly less cryptic answer:
Use what you have now (2.8/Getrag) in conjunction with your imagination to help you pick ratios.

If you had the Getrag you have now, would you like the same gearing but with an engine having 70% more torque?
Are you happy with 1st gear today? How about with more torque?
Are you happy with 2nd gear today? How about with more torque?
Are you happy with 3rd gear today? How about with more torque?
Are you happy with 4th gear today? How about with more torque?
Are you happy with 5th gear today? How about with more torque?

If you like the existing gearing, keep the Getrag (possibly with a rebuild), or get something with similar ratios.

If you don't think you like your current gearing, then imagine if you would like each gear(1-2-3-4-5-(6)) to be shorter or taller. Then, find the gearbox that most closely matches your desires.



I was more concerned about the 3800 S/C project on how it would hold up with the F23 trans.
Since there is more replacement parts for the F23 out there than the stock getrag, its just an option.
Some people on the net have 6-10 or a batch of F23s for sale, just checking in to see what best option is best.

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pmbrunelle
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Report this Post07-09-2020 12:04 PM Click Here to See the Profile for pmbrunelleClick Here to Email pmbrunelleSend a Private Message to pmbrunelleEdit/Delete MessageReply w/QuoteDirect Link to This Post
As a general rule, taller gear ratios are better for transmission durability.

But considering that Justinbart made it into the ten-second club (quarter mile) with an F23 transmission, I think that a stock or lightly modified 3800SC should be no problem, regardless of the ratios.

I would pick the ratios based on the best feeling for the driving experience.
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Report this Post07-09-2020 01:38 PM Click Here to See the Profile for fierosoundClick Here to visit fierosound's HomePageClick Here to Email fierosoundSend a Private Message to fierosoundEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by pmbrunelle:

I would pick the ratios based on the best feeling for the driving experience.


Agreed.

But hard to do unless you can drive a buddy's car with same engine/transmission you are considering.

It's a real pain in the butt if you "guess wrong".


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Will
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Report this Post07-09-2020 02:22 PM Click Here to See the Profile for WillClick Here to Email WillSend a Private Message to WillEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by pmbrunelle:

As a general rule, taller gear ratios are better for transmission durability.

But considering that Justinbart made it into the ten-second club (quarter mile) with an F23 transmission, I think that a stock or lightly modified 3800SC should be no problem, regardless of the ratios.

I would pick the ratios based on the best feeling for the driving experience.


Didn't he have the 3.63 final?
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Report this Post07-09-2020 02:23 PM Click Here to See the Profile for WillClick Here to Email WillSend a Private Message to WillEdit/Delete MessageReply w/QuoteDirect Link to This Post

Will

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quote
Originally posted by La fiera:

I have the Metric 3.94 and it fits my engine's powerband very well, I'm very happy with it.



My current 282 has the 2.19 second and 1.02 fourth. I've building a 3.94 box for it. Judging by how much the 1.02 fourth wakes it up compared to the 0.94 fourth, the 3.94 final is going to rip.
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fieroguru
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Report this Post07-09-2020 06:26 PM Click Here to See the Profile for fieroguruSend a Private Message to fieroguruEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Will:
Didn't he have the 3.63 final?


Yes.
He also had the transmission out of the car for work/repairs a bunch of times.

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Report this Post07-09-2020 06:32 PM Click Here to See the Profile for WillClick Here to Email WillSend a Private Message to WillEdit/Delete MessageReply w/QuoteDirect Link to This Post
Including breaking the left bearing boss right off the diff carrier... which is an impressive testimony to the strength of the case.
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Report this Post07-09-2020 07:31 PM Click Here to See the Profile for pmbrunelleClick Here to Email pmbrunelleSend a Private Message to pmbrunelleEdit/Delete MessageReply w/QuoteDirect Link to This Post
I thought that most of Justin's failures were 282 or Muncie related.
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Report this Post07-10-2020 02:07 AM Click Here to See the Profile for ericjon262Send a Private Message to ericjon262Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by pmbrunelle:

I thought that most of Justin's failures were 282 or Muncie related.


he had an F23 failure, but it was related to the work he performed, IIRC, he installed an oil slinger wrong and messed up the bearings.

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"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."

cognita semper

https://joj2020.com/ <--- She isn't a sexual predator.

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Raydar
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Report this Post07-10-2020 01:56 PM Click Here to See the Profile for RaydarClick Here to Email RaydarSend a Private Message to RaydarEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by ericjon262:

https://joj2020.com/ <--- She isn't a sexual predator.



THIS LINK CONTAINS MALWARE. I had to shut down my computer to get my Antivirus to stop freaking out.
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