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Old 09-09-2016, 10:32 AM   #71 (permalink)
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Geez, I'm about to get my Grand Marquis back on the road for EcoModding, and you're killing it!! I'm hoping to see north of 30 MPG highway now, and you're 13 mpg above! I love it!
I guess I'll have to do that manual 5 or 6-speed swap sooner than I thought!
There's nothing like some friendly competition!
Great work!!


-ryan s.

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Old 09-11-2016, 09:17 PM   #72 (permalink)
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Quote:
Originally Posted by svt98t View Post
Geez, I'm about to get my Grand Marquis back on the road for EcoModding, and you're killing it!! I'm hoping to see north of 30 MPG highway now, and you're 13 mpg above! I love it!
I guess I'll have to do that manual 5 or 6-speed swap sooner than I thought!
There's nothing like some friendly competition!
Great work!!


-ryan s.
No cheap 6 speeds for Fords, but Mustang T5s are cheap. They just need more work if you want to adapt one to a 4.6, the Mustang 4.6 came with a T45, then a TR3650, neither of which is cheap.
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Old 09-11-2016, 09:23 PM   #73 (permalink)
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Originally Posted by funkhoss View Post
I did consider what you are suggesting--not the transmission in the Duramax trucks, though, but rather the five speed transmission that came in 3/4 and 1 ton pickups in the 1990's (the NV4500). With an NV4500, I could theoretically have enough ratio spread for towing and economy, and leave the same rear end in the car all the time.

However, there are a few reasons that I ultimately didn't go that route:

-The NV4500 is a fairly expensive transmission, even used, and pretty much never shows up in U-Pull yards around here. It would have cost at least 10 times what I paid for the NV3500. It also weighs twice as much as the NV3500 and would have required more extensive floorboard and crossmember modifications to fit.
-The NV 4500, besides being heavier, also has more parasitic losses and much wider "gaps" between the gears than the NV3500--all of which would make it less efficient.
-And if I went with the NV4500, I'd be running a "light duty," high-geared rear end while towing--and as I discussed earlier, there are many reasons that isn't a good idea.

-Funkhoss
The Camaro T56 was offered in 3 versions, but with some mix and match you can combine the 2.97:1 first with the 0.50:1 sixth, you can combine the 3.36:1 first with the 0.62: sixth.
The ZF S6-650 had a 0.72:1 sixth in the Fords, but GM versions got 0.76:1, and aside from their size and weight, their internal hydraulic pump adds much drag on the engine. The price is even higher than the Camaro T56, so forget it.
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Old 09-11-2016, 09:27 PM   #74 (permalink)
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Quote:
Originally Posted by ennored View Post
It IS a wide ratio trans:

"Manual transmission swap--NV3500 transmission from 1996 Chevy 1/2 ton truck"

Wide Ratio Gearing Option in Dodge 1500 & GM Full-size Light Trucks:

1 2 3 4 5 R
4.02 2.32 1.40 1.00 0.73 3.55
There was also a 3.49 2.16 1.40 1.00 0.73 version, and 0.73 was not the only od ratio used in these, 0.78 and 0.83 are both common.
These are slightly stronger than T5s, nowhere near as strong as T56s or NV4500s, and the 3.49 version is slightly stronger than the 4.02 version. Either one will fail above 500 HP.
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Old 01-11-2018, 05:09 PM   #75 (permalink)
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Yeah I was going to point that out two, there's two versions, depending on what year it was made. Same for the NV4500. The early years of the NV4500 have nearly the same gearing as the old cast iron SM465 4 speed that's in my 83 chevy pickup. The first gear is so low, it's the "granny gear" and the 2nd gear is really the 1st and what you start off in, so it's really a 3 speed + overdrive. I don't think the NV3500 has such a low gear though

BTW I love this caprice!
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Old 01-12-2018, 10:25 PM   #76 (permalink)
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If you can get this kind of mileage in an oversized pig of a car such as this with a Corvette engine, imagine what GM could do with a lighter, smaller Corvette if they actually cared about fuel economy. I thing 60 mpg in a V8 is possible.

Awesome build. Next step might be to swap in a Duramax.

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