NV7 Delete - Chevy Impala SS Forum
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post #1 of 5 (permalink) Old 02-05-2019, 02:15 PM Thread Starter
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NV7 Delete

Can the NV7 variable assist be deleted by just swapping out the non NV7 gearbox and pump? Has anyone went down this road? I'd like to Install a 12.7 ratio box.

95 Buick RMS
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post #2 of 5 (permalink) Old 02-05-2019, 07:07 PM
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66 hits with "NV7", these jumped out as useful:

Quite a history of hunts to improve on the buggy variable assist design used in this vintage rig. Always best to start with the stickies:

SEO9C1 all gettin' in the weeds on details of the differences = rather interesting intel:

'nother goodin':

You see that you can "delete" the var. assist by just unplugging the connector under the steering shaft/firewall side. You'll notice zero difference in ride either way, - just no longer the cloverleaf jerkover/ghost grab. I infer by your trying to swap the box tighter that you don't like the sloppy Fleetwood steering overall. I found EXTREMELY gratifying results from a complete frontend rebuild - and of course better shocks, bar and ends, coils, tires... Enough that I no longer see the benefit of swapping in a diff. box to match my black car.

I've never read anywhere on here where the box knows what pump it's connected to, so you can drill down on that detail until someone chimes in with experience. The only other bogey may be if the hardlines or comp. fittings are different size or locations for the diff. boxes.

\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear)
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, wait for it... LT-4 knock module!
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post #3 of 5 (permalink) Old 02-05-2019, 10:37 PM
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I did this years ago, sort of...

I installed a Fleetwood LT1 setup into my '79 Caprice project. It of course had the NV7 pump. I removed the wiring from the engine harness, as there was nothing for it to connect to in the old Caprice. I also installed an Impala SS steering box, since the engine was out of the car, making it a quick exercise. I noticed no difference in the way it steered, vs. how my SS does. So, if you're in need of disabling the variable effort steering, you can simply unplug the pump.

I would be interested in how the NV7 behaves with the quicker steering box. As mentioned above, the system is not dependent on the gearing, or the steering box, its mainly between the column, and the pump.

'94 Impala SS
#14 of all TRI-9 Impalas
Kore3 C5 front brakes
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post #4 of 5 (permalink) Old 03-31-2019, 02:35 PM
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FWIW, Hot Rod Feb. 2019 did this...

I usually pick up a copy of Hot Rod magazine whenever I fly. I picked up the February 2019 issue when I flew back to Milwaukee for Christmas and was surprised/delighted to see an article about B-Body steering - which included eliminating the NV7 BS. They also installed a "quicker" steering box as well. Not sure why their wagon is a one-wheeled wonder, as mine has posi, but hopefully the attached scanned jpg's work here and are legible. I also have them saved as pdf's but not sure if I can post them here or not. I'm not saying I did this (it does look intriguing), just showing what Hot Rod did.
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post #5 of 5 (permalink) Old 03-31-2019, 04:29 PM Thread Starter
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I'm halfway through this process. I've installed the non variable assist pump with new hoses. I don't like how the variable ratio box feels. I've sourced a used Impala SS box which I will be sending to Lee to have rebuilt. I am digging my Moog 5552 springs with new Koni's. I may change the 5552's only because they ride a bit high.

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