3.73 rear swap

BARNESGN · 07-02-2019, 10:45 PM

Has anyone tried swapping in a 3.73 rear end in an I4 car?
New to the site.

cooper1965 · 07-03-2019, 09:36 AM

I considered the 3.73 swap before I did the LSD swap. I'm glad I didn't though with the A8. Its very difficult to get the 1-2 shift timing and speed where you want it because it happens to fast. I couldn't imagine having 3.73's and trying to dial that shift in. The M6 would be much more feasible for this swap.

BARNESGN · 07-03-2019, 07:45 PM

Yes that's exactly my thinking, M6 comes with a 3.27 (ltg) so a 3.73 rear gear should pick up some speed. Didn't know if anyone has tried it.

cooper1965 · 07-03-2019, 09:33 PM

I believe you will be the first if you do it, at least with the I4. I know some A8 ss guys did it, and it's almost comical listening to it shift just driving around town lol.

DatsunBob · 10-03-2019, 05:26 PM

Is the 3.73 the SS rear end?

huiez · 10-03-2019, 07:49 PM

Quote:

Originally Posted by DatsunBob

Is the 3.73 the SS rear end?

Yes, that is what my '19 M6 ss has.

EWard · 10-03-2019, 08:33 PM

The SS M6 has much longer transmission gearing than the T4. T4 2nd gear is 61ish, SS 2nd is 68-70. With our transmission ratios I don't think you would want anything shorter.

EWard · 10-03-2019, 08:51 PM

Quote:

Originally Posted by EWard

The SS M6 has much longer transmission gearing than the T4. T4 2nd gear is 61ish, SS 2nd is 68-70. With our transmission ratios I don't think you would want anything shorter.

455 ft/lbs long gearing to help keep the rear under you and keep building hp
vs a 295ft/lbs turbo that needs to be shifted sooner to maintain boost on the stock turbo.

07-02-2019, 10:45 PM	#1
BARNESGN Drives: Sold-G8 GT H/C/I Join Date: Sep 2018 Location: High Point NC Posts: 15	3.73 rear swap Has anyone tried swapping in a 3.73 rear end in an I4 car? New to the site.

07-03-2019, 09:36 AM	#2
cooper1965 Coopers Camaro Drives: 18 Flex Fuel LTG Join Date: Nov 2016 Location: St. Louis/Sullivan/Washington MO Posts: 934	I considered the 3.73 swap before I did the LSD swap. I'm glad I didn't though with the A8. Its very difficult to get the 1-2 shift timing and speed where you want it because it happens to fast. I couldn't imagine having 3.73's and trying to dial that shift in. The M6 would be much more feasible for this swap. __________________ Flex Fuel tuned by me using HPT-:- ---My Build Thread--- -----My IG PAGe-----

07-03-2019, 09:33 PM	#4
cooper1965 Coopers Camaro Drives: 18 Flex Fuel LTG Join Date: Nov 2016 Location: St. Louis/Sullivan/Washington MO Posts: 934	I believe you will be the first if you do it, at least with the I4. I know some A8 ss guys did it, and it's almost comical listening to it shift just driving around town lol. __________________ Flex Fuel tuned by me using HPT-:- ---My Build Thread--- -----My IG PAGe-----

07-03-2019, 07:45 PM	#3
BARNESGN Drives: Sold-G8 GT H/C/I Join Date: Sep 2018 Location: High Point NC Posts: 15	Yes that's exactly my thinking, M6 comes with a 3.27 (ltg) so a 3.73 rear gear should pick up some speed. Didn't know if anyone has tried it.

10-03-2019, 05:26 PM	#5
DatsunBob Drives: ATS 2.0t Rwd Performance Join Date: Jun 2017 Location: Socal Posts: 24	Is the 3.73 the SS rear end?

10-03-2019, 08:33 PM	#7
EWard Drives: 2019 Camaro RBM M6 LTG 1LS Join Date: May 2018 Location: Wake Forest, NC Posts: 66	The SS M6 has much longer transmission gearing than the T4. T4 2nd gear is 61ish, SS 2nd is 68-70. With our transmission ratios I don't think you would want anything shorter.

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