my one concern with this whole thing is how its going to affect the speed of my car at 120+ mph. With my 273's with a 245/50/16 tire, in 3rd gear (1:1) ratio, the car goes 152 - 153 mph at like 5900rpm. It does not however let it shift into overdrive or the 4th gear. My concern is that when I would put 3.73's on my car that in that same 3rd gear at 5900 rpm i would be going only 113 - 115 mph, and that it wont let the car shift to the 4th gear at wot. Now, can the car not shift into that 4th / overdrive at wot or, is the reason it doesnt shift outof 3rd because of the speed limiter? and if i were to take that off or sharpen the rear gear it would shift into 4th even at wot?
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2.73 -> 3.73 gear change
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2.73 -> 3.73 gear change
[COLOR=Navy]2000 Navy Blue Trans Am, T Tops, Automatic, Ram Air, Slp 85mm Mas, Air Lid, Smooth bellow, Hooker 1.75 Lt's, ORY, LM1, Air/EGR delete, Throttle body coolant bypass. Msd super conductor wires. TSP cam, ss3600, svo 38LB injectors.
Ported fast 92 mm intake and 92 mm TB on order.
11.539 @ 118.82 1.649 60 foot.
1969 z28 - 9.957 @ 133.92 1.425 60 foot.Tags: None
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I kinda need to know.... does anyone here have a 2.73 - 3.73 swap?[COLOR=Navy]2000 Navy Blue Trans Am, T Tops, Automatic, Ram Air, Slp 85mm Mas, Air Lid, Smooth bellow, Hooker 1.75 Lt's, ORY, LM1, Air/EGR delete, Throttle body coolant bypass. Msd super conductor wires. TSP cam, ss3600, svo 38LB injectors.
Ported fast 92 mm intake and 92 mm TB on order.
11.539 @ 118.82 1.649 60 foot.
1969 z28 - 9.957 @ 133.92 1.425 60 foot.
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2:73 - 3.73 swap here.
I never gotten up to 150+, 140 is as fast as I've gone. I do shift into forth, but I can't recall if my car did before a tune. It does now and I don't have a rev limiter...well, it moved at 6500.
I hated the 2.73s, it was sluggish and made the car sound like it was drowning.
Can I ask why you'd want to go that fast anyways?
Christopher Teng
1999 · A4 · 3.73's · Auburn LSD · Whisper Lid · K&N · Pacesetter Headers/Y-pipe
Magnaflow Cat & Catback · MSD Coils/Wires · Bosch +4 Plugs · EGR Bypass
B&M SuperCooler · 160* Stat · Descreened MAF · SLP CAI · BMR STB & SFC
Strano Sways · Eibach Springs · Bilstein HD Shocks · Hawk-Pads · Brembo Blanks
Speedlines · Nitto 555s · Texas Speed Mail Tune
Lots of Weight Savings · Stubby Antenna · Corbeau TRS · Zaino · 273K
F-Body Dirty Dozen
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i dont go that fast all the time, but with the 3.73's and the stock 245/50/16 tires it will need to shift into 4th gear about about 113-115 mph (5800-6000 shift point) Its not so much for the 150 + runs as it is the needing it to shift from 3rd to 4th at wot if im racing someone and i need to go faster then 115. I cant be backing outof the throttle to trick the car into shifting into 4th while racing someone.[COLOR=Navy]2000 Navy Blue Trans Am, T Tops, Automatic, Ram Air, Slp 85mm Mas, Air Lid, Smooth bellow, Hooker 1.75 Lt's, ORY, LM1, Air/EGR delete, Throttle body coolant bypass. Msd super conductor wires. TSP cam, ss3600, svo 38LB injectors.
Ported fast 92 mm intake and 92 mm TB on order.
11.539 @ 118.82 1.649 60 foot.
1969 z28 - 9.957 @ 133.92 1.425 60 foot.
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You need to get a tune to correct the speedo. Tuning will also allow a WOT upshift 3-4. You have no choice, the tune is mandatory for driveability and shift behavior, not just the speedo.
It's just my humble opinion, but 3.73 is too much gear for 245 tires. You could save a bunch of money just get a good 3.23 or 3.42 donor axle and do a full swap.
I have street 275's on my vert (heavier) and am traction limited with 3.42's. I did a full axle swap from a donor manual car. 3.73's will just roast 245 tires.
So, don't forget about the cost of tuning and realize you'll lose ~2mpg.
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Originally posted by Dragkid1917my one concern with this whole thing is how its going to affect the speed of my car at 120+ mph. With my 273's with a 245/50/16 tire, in 3rd gear (1:1) ratio, the car goes 152 - 153 mph at like 5900rpm. It does not however let it shift into overdrive or the 4th gear. My concern is that when I would put 3.73's on my car that in that same 3rd gear at 5900 rpm i would be going only 113 - 115 mph, and that it wont let the car shift to the 4th gear at wot. Now, can the car not shift into that 4th / overdrive at wot or, is the reason it doesnt shift outof 3rd because of the speed limiter? and if i were to take that off or sharpen the rear gear it would shift into 4th even at wot?87 GTA: it's winter time, all tore apart
ConElite: "Im 22, have had my TA since I was 21."
"I wont lie, I have a heavy foot, but at the same time I know when its the safest to ring out a gear or 2."
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