Can a 5 or 6 speed auto be fabbed for 4th gen FBody's?
03-24-2010, 05:46 PM
#1
Can a 5 or 6 speed auto be fabbed for 4th gen FBody's? Can a 5 or 6 Speed Auto be fabbed for my 4th Gen F-Body? I know the CTS 5 Speed A5 (5L50E) isn't as strong as the A4, but can that be changed? What about the 6L80E ??
I would like one for my motor swap and I wanna run a 6th gear of 0.50 for the 6L80E or a 5th gear of 0.60 5L50E... Is this possible?
I would like one for my motor swap and I wanna run a 6th gear of 0.50 for the 6L80E or a 5th gear of 0.60 5L50E... Is this possible?
03-24-2010, 07:42 PM
#2
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I'm clueless on this, but question sounded interesting, so I thought I'd see what I could find by searching the Internet with various searches. Here is what I came up with.
I'm not sure what you mean 5 or 6 speed Auto being fabbed for your 4th Gen F Body. IF you mean, Can you install one of them, I'd say yes, but some of them may require you modify transmission tunnel along with a strong possibility of having to use a modified transmission crossmember to mount it.
Did a little research on crossmembers too. Try doing a search by transmission designation with word "crossmember". That should bring up those. You might want to checkout one of the supporting Vendor's thread in Hybrid & Conversions Forum and see what they have are or working on.
The following automatic you mentioned come with the following Final OD ratios.
6L80E 6th OD = 0.67
4L80E 4th OD = 0.75
4L65E 4th OD = 0.70
5L50E 4th OD = 0.76
TCI6X 6th OD = 0.75
Based on what I found for each, it looks like 0.50 OD ratio is out of reach unless aftermarket offers a 0.50 optional gear. Maybe one of the transmission vendors here will comment on that.
That said, I did run across GearVendor OD unit that could accomplish it. Not cheap and you may are may not need to modify trans tunnel to fit it. You would also get 8, 10 or 12 Forward gears with it depending of if it's a 4, 5, or 6 sp trans...
http://www.gearvendors.com/
Check out the below link for answer. They say they did one that will hold LS7.
http://www.wadesgarage.com/gallery/m...g2_itemId=7330
It'shellwhenyouareboredandlookforthingstoentertain yourself.
I'm not sure what you mean 5 or 6 speed Auto being fabbed for your 4th Gen F Body. IF you mean, Can you install one of them, I'd say yes, but some of them may require you modify transmission tunnel along with a strong possibility of having to use a modified transmission crossmember to mount it.
Did a little research on crossmembers too. Try doing a search by transmission designation with word "crossmember". That should bring up those. You might want to checkout one of the supporting Vendor's thread in Hybrid & Conversions Forum and see what they have are or working on.
I would like one for my motor swap and I wanna run a 6th gear of 0.50 for the 6L80E or a 5th gear of 0.60 5L50E... Is this possible?
6L80E 6th OD = 0.67
4L80E 4th OD = 0.75
4L65E 4th OD = 0.70
5L50E 4th OD = 0.76
TCI6X 6th OD = 0.75
Based on what I found for each, it looks like 0.50 OD ratio is out of reach unless aftermarket offers a 0.50 optional gear. Maybe one of the transmission vendors here will comment on that.
That said, I did run across GearVendor OD unit that could accomplish it. Not cheap and you may are may not need to modify trans tunnel to fit it. You would also get 8, 10 or 12 Forward gears with it depending of if it's a 4, 5, or 6 sp trans...
http://www.gearvendors.com/
I know the CTS 5 Speed A5 (5L50E) isn't as strong as the A4, but can that be changed?
http://www.wadesgarage.com/gallery/m...g2_itemId=7330
It'shellwhenyouareboredandlookforthingstoentertain yourself.
03-24-2010, 09:35 PM
#3
Check out the below link for answer. They say they did one that will hold LS7.
http://www.wadesgarage.com/gallery/m...g2_itemId=7330
http://www.wadesgarage.com/gallery/m...g2_itemId=7330
03-24-2010, 10:43 PM
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http://www.wadesgarage.com/index.php
03-25-2010, 08:00 PM
#5
You could potentially bolt a 6L transmission to your motor, but that is a long way from getting it to work. As far as I know, the main issue is getting a controller for the shifts. The 6L series have their own Transmission Control Module that is not compatible with your PCM. I think the aftermarket is allegedly working on something, but who knows how long it will be.
As far as the ratio of 5th or 6th, you don't really want a super high OD. In the 6L transmissions 1st is a very low gear... that is why Vette auto's standard rear end ratio is 2.56 and the performance axle ratio is 2.73!
As far as the ratio of 5th or 6th, you don't really want a super high OD. In the 6L transmissions 1st is a very low gear... that is why Vette auto's standard rear end ratio is 2.56 and the performance axle ratio is 2.73!
03-25-2010, 09:50 PM
#6
You could potentially bolt a 6L transmission to your motor, but that is a long way from getting it to work. As far as I know, the main issue is getting a controller for the shifts. The 6L series have their own Transmission Control Module that is not compatible with your PCM. I think the aftermarket is allegedly working on something, but who knows how long it will be.
As far as the ratio of 5th or 6th, you don't really want a super high OD. In the 6L transmissions 1st is a very low gear... that is why Vette auto's standard rear end ratio is 2.56 and the performance axle ratio is 2.73!
As far as the ratio of 5th or 6th, you don't really want a super high OD. In the 6L transmissions 1st is a very low gear... that is why Vette auto's standard rear end ratio is 2.56 and the performance axle ratio is 2.73!
Edit: I also heard these transmissions also need a TCM to work. So an PCM from a Pontiac G8 GT and the ECM of the like.. ..that should get the motor and trans to function with VVT if I go with a LY6... If I go with a LQ4 then an LS1 Manual PCM and the TCM should work???
Last edited by Need4Camaro; 03-25-2010 at 11:18 PM.
03-26-2010, 08:52 PM
#7
4th Gen Fbodies have a Powertrain Control Module which controls the transmission and engine. The newer GenIV cars have an Engine Control Module for the engine, and separate Transmission Control Module for the automatic transmissions.
No the TCM's are supposedly only compatible with the newer generation ECM's. So if you took the engine and transmission out of a G8 and put both in the car and used the G8 ECM and TCM it would possibly work, but I think you would probably need to retain your stock PCM for some functions. I do not think it is possible to run a GenIII motor with the newer ECM unless you change certain things like the reluctor.
You would need to develop some sort of module to allow the 6L80 TCM to communicate with an LS1 PCM.
No the TCM's are supposedly only compatible with the newer generation ECM's. So if you took the engine and transmission out of a G8 and put both in the car and used the G8 ECM and TCM it would possibly work, but I think you would probably need to retain your stock PCM for some functions. I do not think it is possible to run a GenIII motor with the newer ECM unless you change certain things like the reluctor.
You would need to develop some sort of module to allow the 6L80 TCM to communicate with an LS1 PCM.
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04-01-2010, 10:48 AM
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What would be nice is a spread similar to the manual 6 speed
04-01-2010, 12:11 PM
#11
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I have no ide what can, and can not, be changed in the TCI 6x so it's just a what if but. . . .
If you could change the overdrive between gears to 1.45 you could set up the following
2.97, 2.05, 1.50, 1.03, 0.75, 0.52
with a 3.73 rear end this would yeild a first gear with a little more pull than an m6 with 4.10s and a high gear that would almost exactly the same as an A4 running 2.73s
If you could change the overdrive between gears to 1.45 you could set up the following
2.97, 2.05, 1.50, 1.03, 0.75, 0.52
with a 3.73 rear end this would yeild a first gear with a little more pull than an m6 with 4.10s and a high gear that would almost exactly the same as an A4 running 2.73s
