4T80E 3.11 to 3.71 swap

[AJxtcman]

I have never done a swap from 3.11 to 3.71 gears. Bert want to wake up his DHS and make it a DTS. I think The VIN Y cams are equal if not better in 03. I did some checking and it looks like 2 part numbers is all I will need.
#24205233 is a Carrier, Front Diff. INCLS 101 to 109.
#08678825 is the sun gear
Just the two parts. I can not say my price, but it is worth it. He has the 17" rims already. The difference between the 3.11 with 16" and the 3.71 with 17" is about 3 to 4 MPH at 70.
I would need to set the ABS up for the 3.71 also.

24205233 List $659.60 Trademotion.com $379.73

8678825 List $144.56 Trademotion.com $83.22

Has anyone done this?
I can program it for 3.71

[AJxtcman]

Has anyone done this swap???????????????

[eldorado1]

I have. Pretty simple. The only difficult part is getting the 10" snap ring out. That sucker is like 1/4" thick and difficult to get out of the groove.

[thu]

You might want to tell the computer about the change. I dunno what the side effects would be without it. I suppose you could always go to a dealer and get them to use the Tech Scan Tool on it.

Let us know how it goes.

[AJxtcman]

Originally Posted by eldorado1

I have. Pretty simple. The only difficult part is getting the 10" snap ring out. That sucker is like 1/4" thick and difficult to get out of the groove.

The ring gear is the same part # so the snap ring won't need to come off.
correct?

[AJxtcman]

Originally Posted by thu

You might want to tell the computer about the change. I dunno what the side effects would be without it. I suppose you could always go to a dealer and get them to use the Tech Scan Tool on it.

Let us know how it goes.

I work at a Dealer and can tune the PCM.

[jadcock]

I think that would be the idea situation. The LD8 engine (good torque) with the 3.71:1 final drive. That's how the Pontiac Bonne GXP came I believe (with the 275 hp engine and 3.71 transaxle).

[Maxb49]

Is there a significant improvement in acceleration?

[Maxb49]

By the way, what does this cost?

[AJxtcman]

Originally Posted by jadcock

I think that would be the idea situation. The LD8 engine (good torque) with the 3.71:1 final drive. That's how the Pontiac Bonne GXP came I believe (with the 275 hp engine and 3.71 transaxle).

2005 Pontiac Bonneville
RPO....FV4...Ratio Transaxle Final Drive 3.71
.........LD8...Engine Gas, 8 Cyl, 4.6L, MFI, V6, HO

[eldorado1]

Originally Posted by AJxtcman

The ring gear is the same part # so the snap ring won't need to come off.
correct?

If you can get by without removing that snap ring, then do it. I don't know to be honest, but I don't know why I would go through all that work if they were the same part

But then again, maybe I just assumed they were different.

[AJxtcman]

Originally Posted by eldorado1

If you can get by without removing that snap ring, then do it. I don't know to be honest, but I don't know why I would go through all that work if they were the same part

But then again, maybe I just assumed they were different.

Is the snap ring the one for the sun gear that holds it in place on theoutput shaft?
The ring gear has a large snap ring on it also, but I should not have to take it out.
Warranty time is 3.5 hour to change it.

[eldorado1]

No, the large one holding in the ring gear that eats small babies.

[Maxb49]

Originally Posted by eldorado1

No, the large one holding in the ring gear that eats small babies.

EH! I asked how much it cost! Answer!


HAHA

[AJxtcman]

I have had so many of these tranys a part it is hard to remember. I am not talking about P0741, but the left aft shaft leak (3rd clutch housing failure) or 4th gear band burn up. I had a finnal drive out in the car once, so I know it can be done. I think 3.5 hrs is a lot of time for the way I did it. I have a special snap ring pliers for the output shaft snap ring.