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#1 |
Senior Member
Join Date: Jan 2005
Location: LAX area, So Cal
Posts: 499
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Well, I got the engine fired and running. I haven't driven it yet as I have some more yet to do, but I found some interesting things during the conversion:
1: The PCM needs a brake switch that is open when the pedal is depressed. The regular brake light switch is closed (provides current) when the pedal is depressed. So I need to run 2 switches....no biggie, but one more thing!! 2: The L31 sounds pretty sweet with open headers ![]() 3: The Helms FSM is written and organized like a Taiwanese VCR manual!! ![]() 4: After hours in the back reaches of two parts stores, there is no possible solution for oem radiator hoses for the L31 and the 71 radiator. I had to use one of those crappy flex hoses for the top, and splice 2 hoses together for the bottom. Not ideal, but I want to eventually get an aluminum radiator, so I am not too concerned about the cosmetics of the setup right now. 5: The L31 runs the oil through the radiator in the Suburban. So, since the truck did not have that provision, I was faced with a choice. Either block off the external oi lines, or run an oil cooler. I chose the latter and mounted it under the radiator on the core support. It will get some air flow, but not much. I was worried about keeping the oil too cool. 6: Driveshaft. Had it shortened 3.25" and overhauled. All I can say is that I am very very very glad I did that. One universal had 4 needle bearings (for the whole universal!!!) Center bearing was toast too!!! Well, I have all the gauges working except the speedo (needs to be electronic). I think I will make a new dash panel with all aftermarket gauges though......later though. 7: Tilt Column: This was very easy!! Since all the transmission activity for the 4L60E occurs at the tranny, I could just bypass the PN lockout and the reverse light switch. Made the install very simple!!! 8: Fuel system: I got ALL the hard lines from the Suburban, so I used them. I used the original truck feed line for a return. I drilled a hole in the bottom of the tank and welded a fitting to it and ran some 3/8" Aluminum fuel line to feed the L31. Used the MSD 2225 inline fuel pump that I used with the LT1 in the Z car with a high flow filter before the pump and the OEM suburban filter after. That's about it for now, I guess.......now that everyone is asleep ![]()
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1972 Suburban C20 454/TH700R4, eaton-corporate 4.10 (looking for 3.7) Sold: 71 Cheyenne 20 Installed a 99 5.7L L31/4L60E from Suburban 1500 (2005) Last edited by Tim240Z; 04-10-2005 at 08:32 PM. |
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#2 | |
Bite me, import boy
Join Date: Apr 2005
Location: Eagle Point, Oregon
Posts: 102
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Quote:
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Jason '71 C-10 Deluxe-under construction '69 C20, 396,T400-donor truck, '65 C10 project "Facts are meaningless, You can use facts to prove anything that's even remotely true." |
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#3 |
Registered User
Join Date: Mar 2004
Location: Lexington, KY
Posts: 865
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Please keep us updated on this conversion. I'm absolutely fascinated with these conversions.
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#4 | |
Senior Member
Join Date: Jan 2005
Location: LAX area, So Cal
Posts: 499
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Quote:
Incoma....I will post some pics with some more info later this week. It has been an interesting conversion. Good news is that TunerCat now has editting software for these engines now!!! ![]() ![]()
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1972 Suburban C20 454/TH700R4, eaton-corporate 4.10 (looking for 3.7) Sold: 71 Cheyenne 20 Installed a 99 5.7L L31/4L60E from Suburban 1500 (2005) |
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#5 |
Bite me, import boy
Join Date: Apr 2005
Location: Eagle Point, Oregon
Posts: 102
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This relay is also known as a single throw- double pole relay
Normally open ![]() Relay pinout ![]() Relay energized ![]()
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Jason '71 C-10 Deluxe-under construction '69 C20, 396,T400-donor truck, '65 C10 project "Facts are meaningless, You can use facts to prove anything that's even remotely true." Last edited by HugrOrang71; 04-11-2005 at 02:32 PM. |
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#6 |
Senior Member
Join Date: Aug 2002
Location: Plymouth, MA
Posts: 891
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You can buy a brake switch that has 4 connections. 2 work as normal on the brake switch you have and 2 work the way the engine needs. I am overseas and can't get the part number right now, but I bought one when I installed the LT-1 in my truck. I seem to remember 2 connections on the side and 2 on the end.
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1972 Blazer body...need to get a thread started for the rest of the story |
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#7 |
Senior Member
Join Date: Jan 2005
Location: LAX area, So Cal
Posts: 499
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I looked at the suburban brake pedal switch at the parts store, and decided against it as there was not 'plunger' to speak of. I was unfamiliar with the setup and it looked like it would take a fair bit of engineering to get it working on the truck so I opted for the regular plunger switch.
HO71....could you fix the broken links? I can only see the second (middle) image ![]() NPilot, What vehicle was that switch originally for? MAybe I can hunt it down by application and have a look see? Thanks Guys!!!!
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1972 Suburban C20 454/TH700R4, eaton-corporate 4.10 (looking for 3.7) Sold: 71 Cheyenne 20 Installed a 99 5.7L L31/4L60E from Suburban 1500 (2005) |
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#8 |
Senior Member
Join Date: Jun 2000
Location: yucaipa ca
Posts: 580
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you can use a brake light switch from any car that had cruise control. it has terminals for no and nc and screw into the original mount. simple.
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#9 | |
Senior Member
Join Date: Jan 2005
Location: LAX area, So Cal
Posts: 499
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Quote:
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1972 Suburban C20 454/TH700R4, eaton-corporate 4.10 (looking for 3.7) Sold: 71 Cheyenne 20 Installed a 99 5.7L L31/4L60E from Suburban 1500 (2005) |
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#10 |
Senior Member
Join Date: Aug 2002
Location: Plymouth, MA
Posts: 891
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http://www.painlessperformance.com/a...0509Manual.pdf
Look at the above link, page 12. That should give you what you need.
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1972 Blazer body...need to get a thread started for the rest of the story |
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#11 |
Bite me, import boy
Join Date: Apr 2005
Location: Eagle Point, Oregon
Posts: 102
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Hmm... its showing up on mine. Here's the direct links. Hope they work
Normally open Relay pinout Relay energized
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Jason '71 C-10 Deluxe-under construction '69 C20, 396,T400-donor truck, '65 C10 project "Facts are meaningless, You can use facts to prove anything that's even remotely true." |
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#12 | |
Senior Member
Join Date: Jan 2005
Location: LAX area, So Cal
Posts: 499
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Jason.
I get the forbidden error when trying to access the links: Quote:
Thanks!!
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1972 Suburban C20 454/TH700R4, eaton-corporate 4.10 (looking for 3.7) Sold: 71 Cheyenne 20 Installed a 99 5.7L L31/4L60E from Suburban 1500 (2005) |
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#13 |
Bite me, import boy
Join Date: Apr 2005
Location: Eagle Point, Oregon
Posts: 102
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![]() ![]() Hey Tim, Try this one. I figured the info from painless perf would get you what you need. But, I'm trying to get this to work for my future posts. ![]() Thanks,
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Jason '71 C-10 Deluxe-under construction '69 C20, 396,T400-donor truck, '65 C10 project "Facts are meaningless, You can use facts to prove anything that's even remotely true." Last edited by HugrOrang71; 04-11-2005 at 05:40 PM. |
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#14 |
Senior Member
Join Date: Jan 2005
Location: LAX area, So Cal
Posts: 499
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Get the first, but not the second (red X of death)
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1972 Suburban C20 454/TH700R4, eaton-corporate 4.10 (looking for 3.7) Sold: 71 Cheyenne 20 Installed a 99 5.7L L31/4L60E from Suburban 1500 (2005) |
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#15 |
*************
![]() Join Date: Apr 2005
Location: Pensacola, FL
Posts: 17,846
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Ls1
How is the truck coming? I'm thinking about purchasing an 05 vortec to put in my 69 suburban. What harness did you use? Motor mounts? Tranny mount? Was there an issue with the column shift? Any clearance problems? Thanks,
Rob
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Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 |
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#16 |
Registered User
Join Date: Jun 2002
Location: Lafayette, LA
Posts: 500
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The stock brake light switch for cruise control applications works fine. I have the LT1/4l60e in mine. Also, the relay idea will come in handy when you get ready to control the fans. The computer probably is similar to the LT1, in that it sends a controlled ground for most of the commands to the engine/fans/ac, etc. You have to supply power to one post of the relay, and let hte contolled ground activate it for fans/ac, etc.
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69 SWB LT1/4L60E www.classicplace.com |
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#17 |
Senior Member
Join Date: Jan 2005
Location: LAX area, So Cal
Posts: 499
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I used the brake switch for a 94Z28 ( I have one of those, so I figured what the heck) with cruise control. Works just right!!
I have driven the truck a whopping 10 or so miles now. Drives smooth and the lower RPMs are great!! (BTW, my 350/350 that I took out with <10k mile is for sale in the parts forum....little plug there!!!) I used the oem harness and just pinned out the wires with the FSM in hand. Everything appears to work just fine, except the electric speedo. I used the PCM output wire for signal, but I know better....I need to splice into the wire coming directly from the speed sensor at the trans. The L31 Vortec engines use the same mount locations as the old school SBCs, so mounting was not an issue. Even the tranny X-member bolted to existing holes in the tranny after moving it rearward... The only clearance problem was the linkage at the tranny. The part that slides over the bracket on the chassis was too close to the tranny (I guess the 4L60E is about 3/4" wider at that point). I just cut the arm and re-welded it...no prob.... Some more info: http://67-72chevytrucks.com/vboard/s....php3?t=153872 http://67-72chevytrucks.com/vboard/s....php3?t=154482
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1972 Suburban C20 454/TH700R4, eaton-corporate 4.10 (looking for 3.7) Sold: 71 Cheyenne 20 Installed a 99 5.7L L31/4L60E from Suburban 1500 (2005) Last edited by Tim240Z; 05-10-2005 at 12:02 AM. |
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#18 |
Senior Member
Join Date: Aug 2002
Location: Plymouth, MA
Posts: 891
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Rob-
You can bolt the 4L60E straight to the original auto crossmember. I used the Lokar column shift linkage in my first project, which worked great. I am thinking of going with a floor shifting in my new project due to having a console. I had no clearance problems at all with the 4L60E and a low hump floor.
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1972 Blazer body...need to get a thread started for the rest of the story |
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