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Old 04-25-2016, 04:27 AM   #1
derek1387

 
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3.91 Install gone wild! (Other stuff too!)

So, many of you know over the weekend I installed a 3.91 differential out of a 1LE, replacing my factory 3.27 LSD diff. Also installed the trailing arm bushings, swapped out my tunnel brace with my Shawno72 brace, and did a full Amsoil fluid change to the 75-90 Severe Duty fluid courtesy of Ghosted

I have some pictures, and some information

First off, thanks to my friend David and Jim's Pro Auto in Osage Beach, MO for the lift time. Was much appreciated.

Overall it was a pretty easy swap. I did find out that my exhaust guy...will no longer be my exhaust guy. You will see why in the pictures!

Also changed out my 80mm TB/CAI Intake hose clamps to SURE Motorsports black stainless clamps, and installed an Elite Engineering Clean Side Separator. Cleans up under the hood nicely!

Picked up an Aeromotive 11569 Fuel Pump to change out my factory pump for more flow. Dont think I need it...but got a low fuel pressure code on the way to Osage beach, turned the car off then back on, and it was gone. Better safe than sorry, right!?! So, picked that up (not installed yet, more on that later), and picked up a Ballenger Motorsports AFR500 Wideband setup so i can get some more accurate datalogging information for Overkill.

On with the pics!

SURE Motorsports Black Hoseclamps


Fuel Pump and AFR


Modified the Autocal to read a Wideband



Elite CSS Install







Oh, in case anyone is wondering....your axles are two different sizes. Passenger side is thick, drivers side is thin.


You will want one of these to pop the axles out too









Trailing arm bushings. Worst part of the whole weekend.


Pulled this plug out of the other diff. Terrified me! When they cleaned up the diff, they forgot to pull the plugs to clean them. Boroscoped the new diff and saw no issues.




So, after the install, torqued everything down, dropped the car, and flashed my updated Overkill tune to correct the speedo, then took it out for a drive.

Initial thoughts.....i was not impressed. I couldnt really tell a difference. In all fairness, I was babying the gears. I have read so many things about breaking them in properly, etc, so i took it easy. I got back to the shop, and looked at David and was like "well, this sucks. Either i got screwed, or the gears dont make that much of a difference".

He looked at me, smiled, jumped in, and proceeded to make three long burn outs in 1st, 2nd, and 3rd gear. Backed up, said "dude, drive the damn car".

So, i put the hammer down. WOW. Night and day! So much more pull in every gear if you actually DRIVE the car. This is how the car should have shipped!

And, for the question everyone is going to ask. 6th Gear, 70mph, 2450rpm now, as opposed to 2050. On E85 (which is what i drive on daily now) i averaged 18.1MPG on the way home. That may seem very low. It is. But on the factory 3.27's, i was getting 20-21 on the highway. On gas, i should get about 2-3MPG better.

So....the next thing will be to install the fuel pump and the AFR/Wideband....then....who knows! I am about at the end of all bolt ons. I would like to do a 1 piece drive shaft, an MGW Short Throw...and potentially cams....but I wont comment any more on the cams :-)

Thoughts? Questions? Outbursts?
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Performance- Overkill Tuned, Overkill E85 Kit, CAI Intake, Overkill 80mm TB, Solo HFCs, Jacfab Ported Intake Manifold Spacer, Elite Engineering Catch Can & CSS, Brembo's, Goodridge lines, X Pipe, de-Muffed, Air Scoop, 1LE 3.91 diff, Shawno72 Tunnel Brace
Suspension- 1LE Suspension, BMR Toe Rods, BMR Strut Brace, BMR Trailing Arms and bushings
Style- Amazon Z28 Spoiler, DD LEDs, Phastek Halo Headlights
Sound- Alpine iLX-007, Hertz HDP5 Amp, HSK165, HCX165, 10" HX250D, Audison Wiring/RCA

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Old 04-25-2016, 04:35 AM   #2
derek1387

 
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Oh. And just because she needed a bath.
https://youtu.be/aid1VKHuFtw
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Performance- Overkill Tuned, Overkill E85 Kit, CAI Intake, Overkill 80mm TB, Solo HFCs, Jacfab Ported Intake Manifold Spacer, Elite Engineering Catch Can & CSS, Brembo's, Goodridge lines, X Pipe, de-Muffed, Air Scoop, 1LE 3.91 diff, Shawno72 Tunnel Brace
Suspension- 1LE Suspension, BMR Toe Rods, BMR Strut Brace, BMR Trailing Arms and bushings
Style- Amazon Z28 Spoiler, DD LEDs, Phastek Halo Headlights
Sound- Alpine iLX-007, Hertz HDP5 Amp, HSK165, HCX165, 10" HX250D, Audison Wiring/RCA

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Old 04-25-2016, 04:35 AM   #3
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Which cradle bushings did you use?
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Old 04-25-2016, 04:56 AM   #4
derek1387

 
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Quote:
Originally Posted by IneedAZ View Post
Which cradle bushings did you use?
I did not drop the cradle, so did not switch them. I will be doing that this winter. I just spent $200 on my alignment 2 months ago, so did not feel like i wanted to do that again at this moment in time.

I plan on running BMR's though.
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Performance- Overkill Tuned, Overkill E85 Kit, CAI Intake, Overkill 80mm TB, Solo HFCs, Jacfab Ported Intake Manifold Spacer, Elite Engineering Catch Can & CSS, Brembo's, Goodridge lines, X Pipe, de-Muffed, Air Scoop, 1LE 3.91 diff, Shawno72 Tunnel Brace
Suspension- 1LE Suspension, BMR Toe Rods, BMR Strut Brace, BMR Trailing Arms and bushings
Style- Amazon Z28 Spoiler, DD LEDs, Phastek Halo Headlights
Sound- Alpine iLX-007, Hertz HDP5 Amp, HSK165, HCX165, 10" HX250D, Audison Wiring/RCA

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Old 04-25-2016, 06:16 AM   #5
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Quote:
Originally Posted by derek1387 View Post
I did not drop the cradle, so did not switch them. I will be doing that this winter. I just spent $200 on my alignment 2 months ago, so did not feel like i wanted to do that again at this moment in time.

I plan on running BMR's though.
Dont use the BMR black, use the BMR red. When i initially did the rear swap in my car they stuck the blacks in and they failed without me being hard on it. They lasted about 1.5 weeks. They replaced the bushings again with the same type and again failure. Finally i told them to put the reds in and over 50k miles later since the replacement, no issue except some whine around 40mph. Could have been a bad batch of blacks, but why take the chance.
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Old 04-25-2016, 07:55 AM   #6
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I said the same thing after changing fro 3.27 to 3.91...Feels and acts like a sports car now
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Old 04-25-2016, 08:33 AM   #7
derek1387

 
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Quote:
Originally Posted by bleavens1962 View Post
I said the same thing after changing fro 3.27 to 3.91...Feels and acts like a sports car now
I know right!? Its amazing. Couldnt believe the difference.

Now to decide on whats next.
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Performance- Overkill Tuned, Overkill E85 Kit, CAI Intake, Overkill 80mm TB, Solo HFCs, Jacfab Ported Intake Manifold Spacer, Elite Engineering Catch Can & CSS, Brembo's, Goodridge lines, X Pipe, de-Muffed, Air Scoop, 1LE 3.91 diff, Shawno72 Tunnel Brace
Suspension- 1LE Suspension, BMR Toe Rods, BMR Strut Brace, BMR Trailing Arms and bushings
Style- Amazon Z28 Spoiler, DD LEDs, Phastek Halo Headlights
Sound- Alpine iLX-007, Hertz HDP5 Amp, HSK165, HCX165, 10" HX250D, Audison Wiring/RCA

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Old 04-25-2016, 08:43 AM   #8
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I gotta get me one of these
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Old 04-25-2016, 09:05 AM   #9
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You were busy! Congrats.
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Old 04-25-2016, 09:37 AM   #10
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were did you find the 3.91's
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Old 04-25-2016, 09:52 AM   #11
derek1387

 
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I posted a WTB on C5 and got a new diff local.
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Performance- Overkill Tuned, Overkill E85 Kit, CAI Intake, Overkill 80mm TB, Solo HFCs, Jacfab Ported Intake Manifold Spacer, Elite Engineering Catch Can & CSS, Brembo's, Goodridge lines, X Pipe, de-Muffed, Air Scoop, 1LE 3.91 diff, Shawno72 Tunnel Brace
Suspension- 1LE Suspension, BMR Toe Rods, BMR Strut Brace, BMR Trailing Arms and bushings
Style- Amazon Z28 Spoiler, DD LEDs, Phastek Halo Headlights
Sound- Alpine iLX-007, Hertz HDP5 Amp, HSK165, HCX165, 10" HX250D, Audison Wiring/RCA

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Old 04-25-2016, 06:15 PM   #12
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What was your 1/4 et. With your 3.27's? When do you plan on taking your new mod setup to the track?
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Old 04-25-2016, 07:03 PM   #13
derek1387

 
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I don't drag race so no clue

As for the track, I hope to get to an AutoX course soon :-)


Sent from my iPhone using Tapatalk
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Performance- Overkill Tuned, Overkill E85 Kit, CAI Intake, Overkill 80mm TB, Solo HFCs, Jacfab Ported Intake Manifold Spacer, Elite Engineering Catch Can & CSS, Brembo's, Goodridge lines, X Pipe, de-Muffed, Air Scoop, 1LE 3.91 diff, Shawno72 Tunnel Brace
Suspension- 1LE Suspension, BMR Toe Rods, BMR Strut Brace, BMR Trailing Arms and bushings
Style- Amazon Z28 Spoiler, DD LEDs, Phastek Halo Headlights
Sound- Alpine iLX-007, Hertz HDP5 Amp, HSK165, HCX165, 10" HX250D, Audison Wiring/RCA

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Old 04-25-2016, 07:42 PM   #14
L99CAMA2011


 
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One crucial piece to my puzzle is a 3.27 differential. Thanks bro.
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