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Old 01-09-2010, 10:24 PM   #1
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Question 5.3 in a 71 Chevy truck??

Im putting a 5.3 and 4L60 in a 71 chevy truck. Just wanted to know some details and what kind of problems anybody has had, like clearance issues, tranny Xmember, AC box, motor mounts etc.. any help would be great.
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Old 01-09-2010, 10:57 PM   #2
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You can check out my build thread, it's a 6.0 but basically the same. I built a 68 with a 5.3 a couple of years ago, but I do't have a build thread on it.http://www.ls1tech.com/forums/conver...6-0-4l80e.html
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1971 Nova w/98 Camaro Z28 LS1, 1933 Ford w/01 Camaro B4C LS1, 5.3 Family Truckster

My '72 Chevy truck build, http://www.ls1tech.com/forums/conver...6-0-4l80e.html(Sold)
1971 Nova LS1 Hot Rod feature October 2001 http://www.hotrod.com/featuredvehicl...ova/index.html
1971 Chevy truck build, http://ls1tech.com/forums/conversion...71-c-10-a.html
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Old 01-12-2010, 05:06 PM   #3
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Quote:
Originally Posted by ls1nova71 View Post
You can check out my build thread, it's a 6.0 but basically the same. I built a 68 with a 5.3 a couple of years ago, but I do't have a build thread on it.http://www.ls1tech.com/forums/conver...6-0-4l80e.html
Thanks, what did you do for a tranny mount??
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Old 01-12-2010, 06:27 PM   #4
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Thanks, what did you do for a tranny mount??
I used the factory automatic transmission crossmember, just slid it back and drilled new holes in the frame. Unless you take the cab off, or are real good with an angle drill, you won't be able to use the upper frame bolts, but it's never been a problem.

Also, I used the 72 rubber mount so the holes in the crossmember would work.
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1971 Nova w/98 Camaro Z28 LS1, 1933 Ford w/01 Camaro B4C LS1, 5.3 Family Truckster

My '72 Chevy truck build, http://www.ls1tech.com/forums/conver...6-0-4l80e.html(Sold)
1971 Nova LS1 Hot Rod feature October 2001 http://www.hotrod.com/featuredvehicl...ova/index.html
1971 Chevy truck build, http://ls1tech.com/forums/conversion...71-c-10-a.html
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Old 01-13-2010, 10:31 PM   #5
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Originally Posted by ls1nova71 View Post
I used the factory automatic transmission crossmember, just slid it back and drilled new holes in the frame. Unless you take the cab off, or are real good with an angle drill, you won't be able to use the upper frame bolts, but it's never been a problem.

Also, I used the 72 rubber mount so the holes in the crossmember would work.
Thanks for the info! A friend of a friend is paying me to convert his truck over to a 5.3. You have helped me in the past with a couple issues with the LS1 swap in my 69 chevelle. Check out my pics! Also I like what you did the motor mounts. Did you use the late model truck mount and frame bracket? Just trying to save some $ not having to buy mounting plates. Thanks!!
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Old 01-14-2010, 09:35 PM   #6
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Also I like what you did the motor mounts. Did you use the late model truck mount and frame bracket? Just trying to save some $ not having to buy mounting plates. Thanks!!
Yes that's what I did, I took the frame stands off of the 2003 truck (they unbolt) and fabbed some pieces to them so that they would bolt to my frame. Not having to use the '72 frame stands also allows the F-body exhaust manifolds to be used without hacking a piece out of the frame stand. But I did still have to notch the frame a little.
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1971 Nova w/98 Camaro Z28 LS1, 1933 Ford w/01 Camaro B4C LS1, 5.3 Family Truckster

My '72 Chevy truck build, http://www.ls1tech.com/forums/conver...6-0-4l80e.html(Sold)
1971 Nova LS1 Hot Rod feature October 2001 http://www.hotrod.com/featuredvehicl...ova/index.html
1971 Chevy truck build, http://ls1tech.com/forums/conversion...71-c-10-a.html
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Old 01-14-2010, 09:35 PM
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