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Post Info TOPIC: LQ4 conversion, Take II



- Mike -
Olalla, Wa


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LQ4 conversion, Take II
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The phasing done on a one piece shaft happens when the end is welded one. The thing with a two piece shaft or with slip yokes like a truck is taking the apart and then getting the phasing wrong when going back together. My current one is phased correctly, it’s mainly the yoke that’s wrong with too little spline engagement and too long overall. Hell, at this point I’m not even convinced it’s balanced properly.

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'66 SS Chevelle LQ4/4L80E

'65 Malibu SS (Best of 10.49 @ 130mph 1.51 60')

'31 Ford 5-window model A coupe

'58 F-100 short box fleet side big window custom cab



-Urethane Dave - Alger, WA Moderator

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I just reread your earlier post, you throw me off when you say engine/trans down and pinion down. I am assuming you mean they are both down in the same axis? I have always heard it referred to as the engine/trans is at a downward angle, and the pinion is in an upwards angle. Meaning they are both on the same plane, but the rear of the engine/trans in "down" and the front of the pinion is "up".

 

I think you need to get the proper yoke if you haven't already, and have another shop verify the balance of the shaft.  Not enough spline engagement is very likely the culprit. It took me forever to find the right yoke once I figured it out. All American or whatever their name was fucked everything up so bad.



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- Mike -
Olalla, Wa


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The trans tailhousing at the output shaft is down -2*, the driveline is +.o4*, currently the pinion split line flat surface where the u-joint goes is down -2.5*.

Plug that into the calculator and it good to go. I know that’s not having the two parallel though. I cannot raise the pinion to +2*, almost but then there is a ton of bind on the rear coil springs and it’s really not happy, barely driveable at any speed.

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'66 SS Chevelle LQ4/4L80E

'65 Malibu SS (Best of 10.49 @ 130mph 1.51 60')

'31 Ford 5-window model A coupe

'58 F-100 short box fleet side big window custom cab




- Mike -
Puyallup, WA


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66SSFan wrote:

The phasing done on a one piece shaft happens when the end is welded one. The thing with a two piece shaft or with slip yokes like a truck is taking the apart and then getting the phasing wrong when going back together. My current one is phased correctly, it’s mainly the yoke that’s wrong with too little spline engagement and too long overall. Hell, at this point I’m not even convinced it’s balanced properly.


Yup, which is why I mentioned it.  Based on your commennts the shop you used doesn't sound all that competent so anything is possible(yoke end welded on phased wrong).

Personally I think running it up in the air with wheels turning and just taking a look may give some info.



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'67 Chevelle -- 383ci, Jerico DR4 4 speed -- 3.19 1st gearset, Gear Vendors Overdrive/Underdrive, Strange S60 w/3.54 gears

'70 Camaro -- In the works TT 6.0L, 4L80E, ??? rear end 




- Mike -
Olalla, Wa


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I did that, ran it on jack stands. Everything looked great, but there’s no load on it of course. Going to borrow a pair of 17” wheels and tires from a buddy to try just to eliminate that. These Chinese wheels have never been ran and I bought them the first few months after they came out. Doubtful it’s an issue, but possible. Going to call driveline northwest on payday.

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'66 SS Chevelle LQ4/4L80E

'65 Malibu SS (Best of 10.49 @ 130mph 1.51 60')

'31 Ford 5-window model A coupe

'58 F-100 short box fleet side big window custom cab




- Mike -
Olalla, Wa


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Taking a break from this for a little while.



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'66 SS Chevelle LQ4/4L80E

'65 Malibu SS (Best of 10.49 @ 130mph 1.51 60')

'31 Ford 5-window model A coupe

'58 F-100 short box fleet side big window custom cab




- Todd -
Renton, WA


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Car looks good Mike!



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71 Chevelle 350/350TH

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