file 1978 Pontiac Trans Am FAST EFI, Overdrive, and Performance Upgrades at the V8 Speed & Resto Shop

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17 Sep 2017 22:20 #3871 by oestek
oestek replied the topic: 1978 Pontiac Trans Am FAST EFI, Overdrive, and Performance Upgrades at the V8 Speed & Resto Shop
Next, the crew focused on the rear gear ratio on the T/A. Besides a needing a new pinion seal, the customer wanted a peppier gear, and the overdrive transmission would allow more gear in back without hurting economy or spinning the engine at a high RPM all day.



The original gears didn’t look too bad, but the ratio was like a 2.58:1 open differential, so it was no wonder the car was anemic off the line. Knowing that we were installing a 3.73:1 gearset, we didn’t take the time to do the forensic research to run the numbers on the housing to see what the originals were.



Upon closer inspection, it was found that the retaining pin had a piece chipped out of it, which is never good to have floating around in a rear axle housing.




Kevin Oeste
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17 Sep 2017 22:23 #3872 by oestek
oestek replied the topic: 1978 Pontiac Trans Am FAST EFI, Overdrive, and Performance Upgrades at the V8 Speed & Resto Shop
Once disassembled, the housing was cleaned out with no evidence of major damage or debris.



The old differential, carrier, gears, and caps



And the new goodies. A 3.73:1 ring and pinion set from Motive Gear, and a 28 spline Detroit Trutrac differential to keep both wheels going the same speed when you hit the gas.



The new assembly all assembled with new bearings, all ready to go back into the housing.



New gears installed with pinion depth set and an acceptable pattern on the gears.


Kevin Oeste
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19 Sep 2017 22:43 #3875 by oestek
oestek replied the topic: 1978 Pontiac Trans Am FAST EFI, Overdrive, and Performance Upgrades at the V8 Speed & Resto Shop
Back up top, the engine bay was prepared to reinstall the fresh 400.



This little box of fun should help the T/A run better. FAST EZ-EFI 2.0 fuel injection system ready to install.



Throttle body bolted in place. This intake required an adaptor to convert from the Quadrajet pattern to the square-bore pattern of the FAST EZ-EFI unit.



Flip side



Pre-wiring the temp sensor and the main harness on the TB.


Kevin Oeste
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19 Sep 2017 22:51 #3876 by oestek
oestek replied the topic: 1978 Pontiac Trans Am FAST EFI, Overdrive, and Performance Upgrades at the V8 Speed & Resto Shop
The throttle position sensor and air inlet temp sensor are built into the throttle body, along with 4 fuel injectors.



Minimal wiring to do on this end. Throttle return spring installed.



Hoist ‘em up!



Easy does it…



Touchdown!



The crew took a few minutes to strip and repaint the accessory brackets on the front of the engine.





EZ 2.0 ECM gets mounted in the passenger side inner fender well, and the harness will be tucked as best as it can be without cutting and shortening it.



The crew made a nice little bracket and stashed the ECM on the core support.


Kevin Oeste
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19 Dec 2017 14:07 #3943 by oestek
oestek replied the topic: 1978 Pontiac Trans Am FAST EFI, Overdrive, and Performance Upgrades at the V8 Speed & Resto Shop
The FAST EZ 2.0 box shows indicators of cylinders firing as well as the status of the system when running.





The Shiftworks overdrive conversion looks right at home in the stock console.



You can barely see the FAST throttle body peeking out from under the shaker scoop. We fitted the scoop with a K&N filter and made it functional.



All put back together, you’d never know there was an EFI system, roller cam, and overdrive in this car.





But here’s where you can tell… the cruising RPM is way down!



The car came out great, here's the video series covering the whole project.



Contact us today to breathe some new life into your classic or Muscle Car!

Kevin Oeste
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