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tehbonehead:
2) Big transmissions like the NV4500 and 4L80E do not have provisions for mechanical speedometers in 2WD form. To "fix" this, you'll need the following:
--a) The VSSB or DRAC from a later GM truck or van. You can find them in junk yards for a fairly reasonable price... The internet and eBay are not particularly good sources (look to spend $100 online, vs. my $5 junk yard grab). This will need to be modified to fit your tire/gear selection.
--b) The RARE electronic speedometer from a GASOLINE (FUEL-INJECTED), *NOT* DIESEL 90 or 91 GM Blazer, Suburban, or HD Crew Cab P/U (the last of the box-style trucks), OR, an electronic speedo from a GM van to 95... You can replace the face on the van speedo with the face from your original truck speedo... There are even SOME (not all) van speedos w/ trip odometer that can be used with the truck speedo w/trip odometer faces (some trimming required to fit the extra odometer digit).
--c) The modification instructions and wiring diagrams can be found with a quick Google search. You'll need some basic skills (including board soldering) and tools to do the job, but you'll be able to retain your factory dashboard with factory style gauges and electronic cruise (mechanical cruise is a no-go) and even install anti-lock brakes, if you feel really ambitious.
tehbonehead:
'83 C30 3+3 Camper Special
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tehbonehead:
SLOWLY progressing resto-mod on my 1977 Impala Sport Coupe.

Waiting on $$ and a place to work.

Progress so far:

Front suspension-
Tubular control arms (5/8" ball joint) from Speed Tech, Tie Rod sleeves from Hotchkis, all other steering components from Moog. Large spindles and 12.25" x 2.25" vented rotors from a 71-76 GM B car, Moroso Wheel Studs. (not shown: Hotchkis 1-7/16" Sway bar with Heim-type end links, Hotchkis Lowering springs, QA-1 2-way adjustable shocks, and Energy Suspension booties and bump stops.

Rear Suspension-
'96 GM 8.5" rear axle, Eaton mid-bias clutch-type posi, GM 3.08:1 Ring and pinion, GM (spicer)1350 input Yoke, Moser 30-spline c-clip axles, Moser cap studs and gusseted aluminum cover, Moroso wheel studs, factory GM B-car disc brakes with vented/crossdrilled rotors. (not shown: Hotchkis tubular upper and lower control arms, Hotchkis 1-1/8" rear sway bar, Hotchkis lowering springs, Air Lift in-coil air bags, QA-1 2-way adjustable shocks, and Energy suspension booties and bump stops

Engine/Trans:
454 Chevy at about 400-425 hp (eventually 530 horse or so), Hooker Super-Comp 2" primary to 3" collector full-length headers (eventually in stainless, but plain steel for mockup), factory A/C brackets, Hydraulic slave bellhousing from 88 Chevy P/U, SFI approved Steel Flywheel, 11" GM clutch, NOS MY6 (new process) wide-ratio 4-speed OD (3.06, 2.68 1.00 and 0.73:1) with 1350 output yoke
tehbonehead:
77 Impala Sport Coupe Resto-Mod