Thread: My 1984 K10 - LM7 swap!!

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  1. #281 Re: My 1984 K10 - LM7 swap!! 
    Solving problems BrandonHall10's Avatar
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    Quote Originally Posted by ItHurtz View Post
    needs flowmaster or spintech!
    Right now it's just straight pipes with the big 6.0L cats. Pretty chill at idle, but it gets ROWDY when you step on it.

    Couple more items off the checklist. Got the fuel gauge working. Just needed to run the sender wire to ground through the level sender.

    More importantly... It shifts! Took it around the block and it slid into 2nd. Didn't want to take it any farther than that. With a 2.73 rear end and a 235/75-R15 tire, you run out of road pretty quickly. Anyhow, the math to get that Dakota Digital pulse generator was pretty intense (for a dummy like me at least). I never would have figured it out without the help of Brendan at LT1Swap.com. Big shout out to that guy. Here's the story problem math I used to get it working. The numbers are specific to my application and the tire I plan to run in the future, but the math should work for anyone looking to do the same thing. I'm mostly posting for my own future reference. Everything was done using HPTuners.



    First, apply the 31” tire size (30.5 actual) and 2.73 axle ratio correction to all the shift tables using the "Gear/Tire Wizard." Leave the 40 pulse per trans rotation setting alone for now.


    Trans revolutions per mile:
    Tire size (30.5" diameter, OR 684 revolutions per mile) multiplied by the axle ratio (2.73), will result in 1867.32 drive shaft revolutions per mile. *Calculated by Gear/Tire Wizard*


    VSS P/Rev - Trans:
    8 pulses per rev (Dakota Digital output) DIVIDED by 1.9444 (35 driven / 18 drive) from the speedo gear output. Equals 4.11438 Pulses per trans revolution *Manually calculated*


    VSS Pulses per mile:
    1867.32 (drive shaft revolutions per mile) DIVIDED by 1.9444 (sensor revolutions per driveshaft revolution). Equals 960.358 sensor revolutions per mile. 960.358 (sensor revolutions per mile) times 8 (Dakota Digital pulses per revolution output) equals 7682.864 Pulses per mile. *Manually calculated*



    All that's left on the short list is the trans cooler. Just set the 40k in place for now:

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  3. #282 Re: My 1984 K10 - LM7 swap!! 
    GrandPrix Junkie SgtMarshal's Avatar
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    that math looks super mega ultra complicated. I probably would have made a mistake at multiple points.
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  4. #283 Re: My 1984 K10 - LM7 swap!! 
    Solving problems BrandonHall10's Avatar
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    Trans cooler is in and plumbed. No leaks first try! I should have taken a picture before I put the grill in, but I was in a hurry to wrap it up. Lunch was calling. I hate making AN lines, but I love them when they're done.



    After lunch I filled the T-case (oops!), topped off the trans fluid (too much I think) and dumped a bottle of radiator cleaner in it and gave it it's first full heat cycle. ECT held steady at 196° and the trans temp was right around 145°. Should be ready for actual coolant tomorrow. I noticed it had a slight idle hang when slowing down. Not sure if that's a function of less resolution from the VSS, or something else. I can work on that later. There are still lots of little loose ends to tie up, but as of right now I'm saying it's ready for emissions testing.



    Loose ends off the top of my head:
    Full clean up. Needs a wash and interior detail. There's an inch of dust on everything from sitting for two years and the bed is full of leftovers.
    Radiator overflow jug.
    Tires. A set of raised white letter 31x10.5-R15's should look fantastic on that truck.
    Hook up the tach,
    Add a brake switch signal to the PCM (maybe?)
    Hook a 4wd low signal to the PCM
    Loom all the wires.

    It's so much nicer working on this in the driveway and not in the dirt in the backyard!
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  5. #284 Re: My 1984 K10 - LM7 swap!! 
    GrandPrix Junkie idrivejunk's Avatar
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    Burn rubber, man!
    All Grand Prix, all the time. 69 Model J, 99 GT & GTP coupes. All junk, haha.
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  6. #285 Re: My 1984 K10 - LM7 swap!! 
    Solving problems BrandonHall10's Avatar
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    Quote Originally Posted by idrivejunk View Post
    Burn rubber, man!
    In due time sir. It's going to be a struggle with that 2.73 rear end, but I can try. Should probably have a built transmission on the shelf before I get too crazy.

    Couple more things off the list. I think I fixed the hanging high idle. Killed the throttle cracker in the tune. I may have to revisit this later, but for now I'm happy. Fully flushed the cooling system and topped off with 50/50 green. I really like that Prestone radiator flush stuff. Coolant overflow jug is also in. Forgot I had that stashed on a shelf. Tach works again. All the old wiring was still there. I just had to fish a wire from Red 10 and switch the tack to 4 cylinder. Finally, I wired in the TCC brake switch (I think). Because the truck originally came from factory with an AOD trans with lockup, it already had a 4 pin brake switch. I don't think I will know for sure if that's good until I hit the highway and the torque converter either locks or it doesn't.
    Last edited by BrandonHall10; 06-26-2021 at 07:53 PM.
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  7. #286 Re: My 1984 K10 - LM7 swap!! 
    GrandPrix Junkie idrivejunk's Avatar
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    That was just my way of saying enjoy. To me, the truck looks and by your account is... just about... ready to go do truck stuff like only a square short wide can do. With it's Batmobile color scheme and eager stance. Sharp. Fairly valuable. I dig. Sure ain't getting any easier though is it? Fixing old stuff. Keep plenty of use-and-enjoy effort mixed in with your labor-and-earn disciplines. Hope this project is smooth sailing once it hits the road, and does what you want with minimal additional hassles.
    All Grand Prix, all the time. 69 Model J, 99 GT & GTP coupes. All junk, haha.
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  8. #287 Re: My 1984 K10 - LM7 swap!! 
    Turbo is the way to go. BillBoost37's Avatar
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    Coming along nicely. If you happen to pull the grill out for anything, I might suggest painting the cooler brackets flat black.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  9. #288 Re: My 1984 K10 - LM7 swap!! 
    Solving problems BrandonHall10's Avatar
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    Quote Originally Posted by BillBoost37 View Post
    Coming along nicely. If you happen to pull the grill out for anything, I might suggest painting the cooler brackets flat black.
    Sigh. I really wanted too. I'm pretty sure my kid used up all the flat painting who knows what, so I had to shoot them with gloss. Honestly though, the whole thing pretty much disappears unless you are right up on it looking level into the grill. ...I'll still probably reshoot them in the future. I debated *very lightly* spraying the cooler too. Just to take the "new" off of it.

    Anyhow, It's on the road again! Passed emissions. Took a whole lot of running around, 2 tests and a waiver from the referee. Something worth noting... do your research before going in. Hypothetically, if my donor engine was from 2001, I would have needed an EGR and AIR pump. Since (according to my memory) the donor engine was from a 2003, I didn't need that stuff. According to their rules, the engine must be newer than the original, larger than the original, and have ALL the emissions equipment from the donor vehicle. Once I provided the referee a vin from a 2003 Yukon, I was set. Already had the cats and 4 O2's.

    As you can see, it didn't pass the idle quality first time around. I'm not sure if it was because of the cam or the placement of the cats, but first time on pure 87 was a no go. Fortunately I planned ahead and left home with only 1/2 tank of gas. After the initial failure, I topped it off with E85 and raised the idle. After that, all good. I even got to keep my custom plate!

    Next should be getting some new tires, and wiring on a MIL. But for now I'm just going to enjoy it.

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  11. #289 Re: My 1984 K10 - LM7 swap!! 
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    Good deal! Emissions testing can be a PITA. Time to take a long cruise to nowhere in it just to enjoy it and let it stretch it's legs a bit.
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  12. #290 Re: My 1984 K10 - LM7 swap!! 
    GrandPrix Junkie idrivejunk's Avatar
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    Congrats on the emissions pass. Quite a line of hurdles you have jumped. Hope you get to pass a gas station now and then too. he hee
    All Grand Prix, all the time. 69 Model J, 99 GT & GTP coupes. All junk, haha.
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  13. #291 Re: My 1984 K10 - LM7 swap!! 
    Solving problems BrandonHall10's Avatar
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    Quote Originally Posted by FordMan77 View Post
    Good deal! Emissions testing can be a PITA. Time to take a long cruise to nowhere in it just to enjoy it and let it stretch it's legs a bit.
    I could not agree more! On both accounts.

    Quote Originally Posted by idrivejunk View Post
    Congrats on the emissions pass. Quite a line of hurdles you have jumped. Hope you get to pass a gas station now and then too. he hee
    Haha! Thank you. I think this truck might not be too bad. Not as bad as the S10 anyway. With a 2.73 rear gear and a (eventually) 31" tire, the highway RPM's will be pretty low. Probably too low. According to the math, I will be turning 1621 RPM's at 75 mph in OD or 2316 in D3. All the running around I did yesterday in town, I just left the thing in D3. Seemed to be pretty happy there. Didn't put it in OD till I hit the highway. I think eventually I'll have to regear it.

    Or do I axle swap it... Maybe some 3/4 ton's? Hmmm...
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  14. #292 Re: My 1984 K10 - LM7 swap!! 
    GrandPrix Junkie SgtMarshal's Avatar
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    maybe an 88-98 heavy half ton. 9.5" and semi float. I'm sure you know about them already. I found one locally for 100 bucks and went and picked it up. it has a 3.42 final drive and is supposed to be a G80. still sitting in my back yard. but it's heavy as hell and would be bad to ship. the 2 wheel drive versions are supposed to be narrower than the 4x4 versions.
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  15. #293 Re: My 1984 K10 - LM7 swap!! 
    Solving problems BrandonHall10's Avatar
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    Quote Originally Posted by SgtMarshal View Post
    maybe an 88-98 heavy half ton. 9.5" and semi float. I'm sure you know about them already. I found one locally for 100 bucks and went and picked it up. it has a 3.42 final drive and is supposed to be a G80. still sitting in my back yard. but it's heavy as hell and would be bad to ship. the 2 wheel drive versions are supposed to be narrower than the 4x4 versions.
    I know next to nothing about 4x4 truck axles. I will have to educate myself on them soon. It looks like it's going to be substantially cheaper to do complete axle swaps (myself) than pay someone to do a ring and pinion change. I'd like to add lockers at that time also. That's also on the list of long term fixes. For now I just drive around in D3 I guess.

    All the things done since it was sent off for completion:



    One thing not on the list... A MIL. I rigged up this light as a temporary solution. Not exactly in the line of sight, but the hole was already there. Eventually I'll add something to the ICP. This is good for now though. I'm on the hunt for an original '73-'87 "SERVICE ENGINE SOON" lense filter that goes in place of the CHOKE.



    And some pictures of the engine as it currently sits.





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  16. #294 Re: My 1984 K10 - LM7 swap!! 
    GrandPrix Junkie ItHurtz's Avatar
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    Does she light em up?
    2000 GTPT Sold-brandonhall10 built trans
    2009 Challenger SRT8
    http://www.grandprixforums.net/threa...uestion.....no
    Expert at being gay.
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  17. #295 Re: My 1984 K10 - LM7 swap!! 
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    Quote Originally Posted by ItHurtz View Post
    Does she light em up?
    Not even close. According to the math, I could do 60mph in 1st gear at 6k rpm. This thing has some TALL gears.
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  18. #296 Re: My 1984 K10 - LM7 swap!! 
    GrandPrix Junkie idrivejunk's Avatar
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    (throws pail of water under right rear tire, goes haha)
    All Grand Prix, all the time. 69 Model J, 99 GT & GTP coupes. All junk, haha.
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  20. #297 Re: My 1984 K10 - LM7 swap!! 
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    Quote Originally Posted by BrandonHall10 View Post
    Not even close. According to the math, I could do 60mph in 1st gear at 6k rpm. This thing has some TALL gears.
    Holy crap, its a long distance runner LOL
    2000 GTPT Sold-brandonhall10 built trans
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  21. #298 Re: My 1984 K10 - LM7 swap!! 
    Solving problems BrandonHall10's Avatar
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    Quote Originally Posted by idrivejunk View Post
    (throws pail of water under right rear tire, goes haha)
    Haha! I've heard the fellas in Hollywood use WD-40. Easy spin plus some bonus smoke.

    Quote Originally Posted by ItHurtz View Post
    Holy crap, its a long distance runner LOL
    The thing is fantastic on the highway. Grandma and grandpa used to take this truck on their annual trip from Michigan to Florida and back. I can see why.
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  23. #299 Re: My 1984 K10 - LM7 swap!! 
    Killa Bee Scottydoggs's Avatar
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    damn look at all the room in that bay. twin turbo it, grand parents would be proud of ya lol

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  24. #300 Re: My 1984 K10 - LM7 swap!! 
    Solving problems BrandonHall10's Avatar
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    Quote Originally Posted by Scottydoggs View Post
    twin turbo it, grand parents would be proud of ya lol
    I have no doubt this is true. However... Knowing what I know now about emissions testing, there is no way I could get anything like that past the Stasi. If the rules ever change, my plans might change. As for now, she's staying NA. Now the S10 on the other hand... That might get a toolbox turbo some day.

    Took care of something that's been nagging me since day one. This truck only came with one key, and it was a copy. Plus, the 37 year old ignition cylinder was pretty wore out. To the point that you could pull the key out with the truck running. Not cool. So I ordered up an AC Delco cylinder with matching keys.



    Hardest part was getting one little snap ring off.



    Everything in order.



    Back together, and it still runs!



    Not 100% sure if this is the original cylinder, but I'm still going to hold on to it. Just toss it in the box of other OEM take off that I may need someday. The old RR key tag stays with the new keys.



    New door lock cylinders are on their way also. It's probably just me, but nothing satisfies like SHARP, fresh, matched, OEM key(s). I switched out the ignition and door lock cylinders on my S-10 also. This is a great way to add a little "new" feeling to an old vehicle. Knowing that I have the only possible key combination for a vehicle gives me a little piece of mind also. It's the small things.
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