Need some transmission advice... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

runpasthefence · 12-31-2008, 09:36 AM

I'm replacing the previous owner's 396 in my newly acquired '69 SWB with an 04 LQ9 that' drive by wire. I had originally planned on re-using the TH400, but it turns out he was running a 700R4.
There is no way to hook up the TV cable on an electronic throtte body...so my options are...

1) Sell my electronic pedal assembly, buy a cable driven throttle body and LS1 TV hook up kit
2) Sell the 700R4 and 396 as a package, use money to buy a 4L80 and maybe a new driveshaft
3) Fab up some TV system that hooks to the electronic pedal and reuse the 700r4

I am working on a budget of course. If money wasn't an issue I'd have a 6L80 in there now, but if you guys think I recoup the cost of a 4l80 and driveshaft with the sale of my 396/700r4 combo, then I might go that route.

What do you think?

1968SWBBigBlock · 12-31-2008, 10:39 AM

Do a search on the net - someone is making a constant pressure switch or valve body for the 700R4
I would also do a search in google with your question - I would think many street rods are fly by wire today and using the 700R4

**LEEVON** · 12-31-2008, 12:10 PM

I would sell or trade the DBW throttle body and wiring harness (LS1tech) and pick up a DBC set. Add the bowtieoverdrives LS1 TV kit and you're set. The only cost should be the TV kit.

Downsides. If you were planning on running cruise control it will be a little harder with DBC, and you need a VSS signal for the ECM I believe.

I have been thinking about using a 700R4 with a cable driven speedo for my swap so I could keep the stock guages. Jagsthatrun.com has a VSS converter that goes in line with the speedo cable for $60.

EDIT: You probably know, but you will need a flywheel spacer and bolts for the 700R4 but these can be had for around $40.

12-31-2008, 09:36 AM	#1
runpasthefence Registered User Join Date: Sep 2008 Location: Charleston, SC Posts: 159	Need some transmission advice... I'm replacing the previous owner's 396 in my newly acquired '69 SWB with an 04 LQ9 that' drive by wire. I had originally planned on re-using the TH400, but it turns out he was running a 700R4. There is no way to hook up the TV cable on an electronic throtte body...so my options are... 1) Sell my electronic pedal assembly, buy a cable driven throttle body and LS1 TV hook up kit 2) Sell the 700R4 and 396 as a package, use money to buy a 4L80 and maybe a new driveshaft 3) Fab up some TV system that hooks to the electronic pedal and reuse the 700r4 I am working on a budget of course. If money wasn't an issue I'd have a 6L80 in there now, but if you guys think I recoup the cost of a 4l80 and driveshaft with the sale of my 396/700r4 combo, then I might go that route. What do you think?

12-31-2008, 10:39 AM	#2
1968SWBBigBlock Active Member Join Date: Oct 2006 Location: Ohio Posts: 1,643	Re: Need some transmission advice... Do a search on the net - someone is making a constant pressure switch or valve body for the 700R4 I would also do a search in google with your question - I would think many street rods are fly by wire today and using the 700R4 __________________ 1968 SWB 454 + .040, 490HP x 540 FT pounds of Torque 10-1 Kb Forged pistons, recon rods w/ ARP wave loc bolts 781 heads Ported with 2.19/1.88 SSTvalves Lunati 60204 cam, Micro Trol lifters, Ported Edelbrock Performer Rpm manifold armor coated, Pertronix Triple Strike Ignition Holley 770 Street Avenger carb,Headers armor coated Built by Watson Ruppel Performance in Sarahsville Ohio. Hardshift Tranny Built Turbo 350,TSI 10" 3000 stall 12 Bolt Eaton Posi 4.10 Richmond Gears moser axles 18.5" x 31" Hoosier Pro Street Radials ET Classic 5 Wheels - polished Power Steering, Power Brakes,Disc Brakes,Tach & Gauge Dash, Tilt,Factory Air (gone) Custom Paint & Body Work Special thanks to my wife, my son and my money tree

12-31-2008, 12:10 PM	#3
LEEVON Moderator Join Date: Jul 2006 Location: Ozark, MO Posts: 4,893	Re: Need some transmission advice... I would sell or trade the DBW throttle body and wiring harness (LS1tech) and pick up a DBC set. Add the bowtieoverdrives LS1 TV kit and you're set. The only cost should be the TV kit. Downsides. If you were planning on running cruise control it will be a little harder with DBC, and you need a VSS signal for the ECM I believe. I have been thinking about using a 700R4 with a cable driven speedo for my swap so I could keep the stock guages. Jagsthatrun.com has a VSS converter that goes in line with the speedo cable for $60. EDIT: You probably know, but you will need a flywheel spacer and bolts for the 700R4 but these can be had for around $40. __________________ '86 GMC C30 Crew ~ '86 C20 Crew ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '74K10 ~ '71 Cheyenne swb ~'50 3100 bagged ~ '80 Wife ~ Late model kids Last edited by LEEVON; 12-31-2008 at 12:11 PM.



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