does anyone want to trade 5th gears?
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From: GO PACK GO
Car: 83Z28 HO
Engine: Magnacharged Dart Little M 408
Transmission: G Force 5 speed
Axle/Gears: Moser 9" w/Detroit Trutrac
Re: does anyone want to trade 5th gears?
I have a .59 fifth....it's great on the highway!
The original trans that came with my car was a .73 ratio 5th gear. I seem to remember the tach reading around 2800 doing 70 mph on the freeway...and I had 3.73 rear gears too.
Now I run around 2100...
The original trans that came with my car was a .73 ratio 5th gear. I seem to remember the tach reading around 2800 doing 70 mph on the freeway...and I had 3.73 rear gears too.
Now I run around 2100...
Joined: Sep 2005
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Re: does anyone want to trade 5th gears?
I've got a 6-cyl car. Anybody want to trade a IROC convertible for it? 
That's basically similar to what you're asking for.
I accidentally ended up with one of those .63 gas-mileage deals one time, when I forgot to swap it out in some core I used... I HATED it. I didn't even wait for the trans to tear up again before I ripped it out and put the stock .73 back in. It always felt like it was missing a 4½th gear somehow. RPM was too low in 5th, but the jump shifting down to 4th was too much.
Good luck; but that's exactly what it'll take to find someone willing to downgrade their nice performance setup to the LG4/TBI gas-mileage one.

That's basically similar to what you're asking for.
I accidentally ended up with one of those .63 gas-mileage deals one time, when I forgot to swap it out in some core I used... I HATED it. I didn't even wait for the trans to tear up again before I ripped it out and put the stock .73 back in. It always felt like it was missing a 4½th gear somehow. RPM was too low in 5th, but the jump shifting down to 4th was too much.
Good luck; but that's exactly what it'll take to find someone willing to downgrade their nice performance setup to the LG4/TBI gas-mileage one.
Joined: Jul 2000
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From: Aridzona
Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R
Re: does anyone want to trade 5th gears?
I always found the .63 and 3.73 to work well together, up to 140mph.
Thread Starter
Junior Member
Joined: Sep 2008
Posts: 78
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From: Nova Scotia
Car: 85 Z28
Engine: 350
Transmission: T5
Axle/Gears: 3.73
Re: does anyone want to trade 5th gears?
I agree with you sofa, the trans in the car now is .73 and I find it to be a nice drop between 4th and 5th, but I dont do much highway driving. Ive seen posts of people wanting a .63 so I figured Id give it a try, maybe 2 of us can get what we want.
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iTrader: (4)
Joined: Oct 1999
Posts: 4,211
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From: GO PACK GO
Car: 83Z28 HO
Engine: Magnacharged Dart Little M 408
Transmission: G Force 5 speed
Axle/Gears: Moser 9" w/Detroit Trutrac
Re: does anyone want to trade 5th gears?
Sorry - I hated running that hard cruising on the freeway with the .73 ratio.
That being said, I'd also hate a .63, or even worse a .59 ratio with a 6 cylinder. On a strictly performance stand point, I would guess you'd want whatever ratio it takes to make it to the finish line without hitting the rev limiter.....not my goal for a street car I take on a highway...
- But then again, I never tried the .59 or a .63 ratio 5th when I ran my 305 in the car...maybe I'd hate it too...
That being said, I'd also hate a .63, or even worse a .59 ratio with a 6 cylinder. On a strictly performance stand point, I would guess you'd want whatever ratio it takes to make it to the finish line without hitting the rev limiter.....not my goal for a street car I take on a highway...
- But then again, I never tried the .59 or a .63 ratio 5th when I ran my 305 in the car...maybe I'd hate it too...
Last edited by Confuzed1; Jan 4, 2014 at 04:36 PM.
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