3.70 Gears Installed.....2014 A6 - Chevy SS Forum
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post #1 of 11 (permalink) Old 05-20-2017, 12:49 AM Thread Starter
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3.70 Gears Installed.....2014 A6

Well.....finally got the gears installed this past weekend.

Actually, about a year back, I scored the entire gear case from a totaled 2015 M6. Yes.....the install was a direct swap.

Anyway, I have to the say that I'm still getting used to the shift characteristics; I drive in sport mode and upshift through the gears manually. I shift based on engine speed.....specifically, on the sounds generated at a given engine speed. With the new gears, I'm relearning shifting at the appropriate engine speed; as it stands, I'm shifting early and below the required vehicle speed into 4th, 5th and 6th gear so I've gotten a number of 'denied shifts'.

As for how the car performs? Great.....lovin' it! Hitting the gas in any gear, and the car just propels forward! Due to higher RPMs at any given speed, the engine is several hundred RPMs closer to it's 'sweet spot'....this obviously helps.

MPG in the city is up, MPG on the HWY is down. After my first fill-up, total MPG is a wash.....right around 16-17 MPG, 'normal driving' with the occasional 'goosing' of the throttle! LOL

BTW.....75mph on cruise control over a level highway came out to about 23 MPG (remember, I got a 429ci) with the stock gears. Looks to be about 21 MPG with the 3.70's, and I find that to be a VERY acceptable trade-off!

More driving impressions to follow.

KW
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2014 Red Hot 'SS'......TSP 429ci LS3 w/DW 102mm TB, FAST Ported Intake, PRC 260 Heads, 244/256 cam, SW 1 7/8" LT Headers & 3" Exhaust, Borla Touring, 3.70 gears, 3200 Yank TC -- 538HP @ 7200 RPMs/493TQ @ 5800 RPMs

1995 Impala SS.........LS3 w/Custom CAI, V-max 90mm TB, TSP CNC Ported Heads to Stock SCR, Lingenfelter GT1-1 cam, Headman Mid-length (more like shorty) Headers, 2 1/2" cat-back, 3200 Circle-D TC, 3.42 gears (for now) -- 450 HP/400 TQ

1996 Impala SS.........Solid Roller 398ci LT4

Last edited by KWBaraka; 05-20-2017 at 12:51 AM.
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post #2 of 11 (permalink) Old 05-20-2017, 01:00 AM Thread Starter
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Oh.......BTW.........No More Engine 'Lugging'!!

Because engine speeds are a bit higher, the engine no longer lugs at (for example) 30 to 35 mph in 5th gear.....or.....45 to 50 mph in 6th gear.

A definite plus given my driving style and traffic characteristics in San Antonio!

KW
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2014 Red Hot 'SS'......TSP 429ci LS3 w/DW 102mm TB, FAST Ported Intake, PRC 260 Heads, 244/256 cam, SW 1 7/8" LT Headers & 3" Exhaust, Borla Touring, 3.70 gears, 3200 Yank TC -- 538HP @ 7200 RPMs/493TQ @ 5800 RPMs

1995 Impala SS.........LS3 w/Custom CAI, V-max 90mm TB, TSP CNC Ported Heads to Stock SCR, Lingenfelter GT1-1 cam, Headman Mid-length (more like shorty) Headers, 2 1/2" cat-back, 3200 Circle-D TC, 3.42 gears (for now) -- 450 HP/400 TQ

1996 Impala SS.........Solid Roller 398ci LT4
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post #3 of 11 (permalink) Old 05-20-2017, 09:31 AM
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Originally Posted by KWBaraka View Post
Oh.......BTW.........No More Engine 'Lugging'!!

Because engine speeds are a bit higher, the engine no longer lugs at (for example) 30 to 35 mph in 5th gear.....or.....45 to 50 mph in 6th gear. KW
Glad you're enjoying it, should be a very noticeable improvement in acceleration but I certainly never find my stock 2016 A6 lugging. Don
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post #4 of 11 (permalink) Old 05-20-2017, 10:04 AM
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Big cubes + bigger gears = big grins. Congrats! Bet it's a hoot to drive.
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post #5 of 11 (permalink) Old 05-20-2017, 10:17 AM
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Nice swap!
What is your rpm at 75mph in 6th?
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post #6 of 11 (permalink) Old 05-20-2017, 04:13 PM
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Very cool. Gear swaps definitely can make a car more fun around town (assuming traction isn't an issue), even if it doesn't make you much or any faster at the track.

I'd be curious if anyone has done this on a stock or near stock car.


On a related note, I'm shocked your engine was ever "lugging" with a 3200 stall. Must be the cam setup you're using.

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post #7 of 11 (permalink) Old 05-21-2017, 09:51 AM
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Are you selling the old rear end? Any one selling there stock rear? Thanks
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post #8 of 11 (permalink) Old Yesterday, 01:53 PM Thread Starter
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Nice swap!
What is your rpm at 75mph in 6th?
At 75 mph, I'm at about 2350 RPMs.


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Originally Posted by 69Mach390 View Post
Very cool. Gear swaps definitely can make a car more fun around town (assuming traction isn't an issue), even if it doesn't make you much or any faster at the track......
Won't be faster through the traps, but it will be quicker to the line.


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.......On a related note, I'm shocked your engine was ever "lugging" with a 3200 stall. Must be the cam setup you're using.
You manually shift the A6 to 5th gear and get your speed down below 30 mph.....and yours will probably lug. The thing about manually shifting the A6 is that it will hold its gear no matter how hard you stomp the throttle.....no automatic downshifting. You'd have to manually downshift to 4th at that point if you plan to go anywhere briskly.

KW

2014 Red Hot 'SS'......TSP 429ci LS3 w/DW 102mm TB, FAST Ported Intake, PRC 260 Heads, 244/256 cam, SW 1 7/8" LT Headers & 3" Exhaust, Borla Touring, 3.70 gears, 3200 Yank TC -- 538HP @ 7200 RPMs/493TQ @ 5800 RPMs

1995 Impala SS.........LS3 w/Custom CAI, V-max 90mm TB, TSP CNC Ported Heads to Stock SCR, Lingenfelter GT1-1 cam, Headman Mid-length (more like shorty) Headers, 2 1/2" cat-back, 3200 Circle-D TC, 3.42 gears (for now) -- 450 HP/400 TQ

1996 Impala SS.........Solid Roller 398ci LT4
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post #9 of 11 (permalink) Old Yesterday, 06:22 PM
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At 75 mph, I'm at about 2350 RPMs.




Won't be faster through the traps, but it will be quicker to the line.




You manually shift the A6 to 5th gear and get your speed down below 30 mph.....and yours will probably lug. The thing about manually shifting the A6 is that it will hold its gear no matter how hard you stomp the throttle.....no automatic downshifting. You'd have to manually downshift to 4th at that point if you plan to go anywhere briskly.

KW
Maybe (as far as 1/4 mile times go). Definitely seen it more than once where an auto car gained nothing at the track from a gear swap. Now stall + sticky tires is another story! Either way, it definitely increases the fun factor!

As far as the lugging goes..... why would you do that? It's like you're purposefully trying to lug the motor. Personally I just let the auto shift for itself, seems to do better in terms of both performance and fuel economy that way (even if it isn't as much fun) and no lugging.

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post #10 of 11 (permalink) Old Yesterday, 10:49 PM Thread Starter
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Originally Posted by 69Mach390 View Post
......As far as the lugging goes..... why would you do that? It's like you're purposefully trying to lug the motor.......
What would make you think I was purposely lugging the motor?

KW

2014 Red Hot 'SS'......TSP 429ci LS3 w/DW 102mm TB, FAST Ported Intake, PRC 260 Heads, 244/256 cam, SW 1 7/8" LT Headers & 3" Exhaust, Borla Touring, 3.70 gears, 3200 Yank TC -- 538HP @ 7200 RPMs/493TQ @ 5800 RPMs

1995 Impala SS.........LS3 w/Custom CAI, V-max 90mm TB, TSP CNC Ported Heads to Stock SCR, Lingenfelter GT1-1 cam, Headman Mid-length (more like shorty) Headers, 2 1/2" cat-back, 3200 Circle-D TC, 3.42 gears (for now) -- 450 HP/400 TQ

1996 Impala SS.........Solid Roller 398ci LT4
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