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LM7 -> LQ4 swap...

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Old 06-05-2014, 03:05 PM
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Question LM7 -> LQ4 swap...

Just making sure I have all of my ducks in a row and about to order the last few parts.

Already have:
2004 LQ4 long block
2004 2WD 4L80E
4L80E jumper harness (Speartech?)
Melling oil pump
intake manifold gaskets (GM)
Front 02 sensors (GM)
oil filter and oil
coolant

Trans crossmember on order (thanks Tyler)

To be ordered:
I have settled on the ZL10 cam from TPIS

My list from Rock Auto - FEL-PRO oil pan gasket set, engine timing cover set, and valve cover gasket set. Crank main bearing seal. (rear) LS2 timing set.

LS6 valve springs, crankshaft bolt, and LS9 head gaskets from SDPC.

eBay - 7.4" $80 pushrods and $90 head studs. (cheap knock offs, but whatever - it's not a race truck)

Am I missing anything? I'm not sure what to do about injectors. I have a stock set out of an LQ4, but they have been sitting for a few years. (Worth having them cleaned? Or just buy new?) I plan to get a basic 87 octane mail order tune to get it up and running. Then have it tuned street/dyno when I find someone local. (Not sure who will tune it yet, not many options anymore)

Thanks in advance...
Old 06-08-2014, 07:29 PM
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Transmission crossmember arrived Friday afternoon. Picked up a brand new set of 8.1L 31# injectors cheap yesterday. By what I have read, they will be adequate. (More importantly, a direct swap with no mods required other than in the tune)

Will be ordering gaskets in 2-3 weeks. Thinking of sending the heads to AI for the basic rebuild and clean up. (Can't beat the price @ $400)
Old 09-06-2014, 01:26 PM
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All of the parts are here, sending the heads to AI this week.

Quick question... will my driveshaft work? Or does it need to be shortened?
Old 09-06-2014, 03:46 PM
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driveshaft will work with a th400 slip yoke and a bastard u joint. i have the part # for the u joint at home. i saw somewhere on here that someone found a slip yoke that uses the stock u joint, but i have no idea of the part number for it.
Old 09-06-2014, 06:50 PM
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A friend of mine gave me a yoke, I'll have to post a picture. He had an LQ4/4L80E swap in a 96' Tahoe and used the yoke he gave me with the stock DS.
Old 10-16-2014, 02:40 PM
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Ended up not sending out the heads, budget just wasn't there. Valve springs are changed, cam swapped. Planning on wrapping up the long block Saturday. Keep forgetting to get a picture of the yoke I have.
Old 10-19-2014, 05:50 AM
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just finished up basically the same project in my 2004 RCLB, my stock one piece driveshaft ended up being the right length, just a crossover u-joint, the bigger yoke and that was all i needed..
Old 11-01-2014, 09:44 AM
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Thanks for the reply, been meaning to post. Finally got around to snapping a picture of the yoke I have.

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And my transmission...

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I still need to find a u joint for it ASAP, I'll be starting the tear down on the 6th.

Last edited by Bluecollar Hotrods; 11-01-2014 at 09:50 AM.
Old 11-05-2014, 08:06 PM
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Long block is all buttoned up, tear down starts tomorrow afternoon.

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Old 11-07-2014, 07:18 PM
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Engine is almost ready to come out. Having trouble getting the starter out, and the nuts holding the y pipe to the manifolds will not budge. Going to carefully apply some heat to them tomorrow morning.


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