Axle on Leaf Spring Placement - The 1947 - Present Chevrolet & GMC Truck Message Board Network

robertsjm711 · 12-24-2017, 04:14 PM

I have a 53 3100 with a S10 frame and 12 bolt axle and have a placement question.

Does the axle center-line need to be lined up with the pin/bolt of the leaf springs? Can it me moved forward and inch or so with a new/modified bracket?

When I moved the leaf spring mounts I did my best to center the wheels in the fenders, but they may be a little to the rear. Its not bad, but something others probably won't notice. Another reason is the length of driveshaft - many premade ones are maxed out from my axle to trans. The M20 I am using is a little shorter than other trans (so I have read) and don't want to use a jointed driveshaft.

I have searched some on this - and either I am not using the right terminology or the images are not visible due to the photobucket thing.

Thoughts?

sweetk30 · 12-24-2017, 04:49 PM

http://diy4x.com/product.php?product...cat=250&page=4

http://www.ruffstuffspecialties.com/...hantiwrap.html

http://offroaddesign.com/catalog/14b...ingperches.htm

here ya go . very comon in the off road world to do .

some do 1" plus or minus . others do 1" or 1.5" and you weld it on what way you plan to move it .

robertsjm711 · 12-24-2017, 04:51 PM

Perfect. This is exactly what I needed, thanks.

sweetk30 · 12-24-2017, 04:59 PM

just make sure you get top plates to work with the axle moved . if 1 moves the other has to move . or the u-bolts will be at a crazy angle .

robertsjm711 · 12-24-2017, 05:02 PM

Yes, the whole thing will move as a unit. The perches are only tacked onto the axle tube, I wasn't sure on the angle of the engine/trans to set the pinion angle so replacement/modification should be easy.

sweetk30 · 12-24-2017, 05:19 PM

what i am saying is you need new u-bolt plates along with the perches that weld to the tube .

if your center pin hole is no longer centered then the u-bolt plate needs the same off center in its self . = stock plates will NOT work anymore .

http://diy4x.com/product.php?product...cat=250&page=4

http://www.ruffstuffspecialties.com/...25GM-UPLT.html

http://offroaddesign.com/catalog/Rear%20U-Bolts.htm part way down the page is plates .

robertsjm711 · 12-24-2017, 05:34 PM

Yes, we are on the same page. I need to get new U-bolts as the ones I have are old and off of who-knows-what. Just something laying around for mock up purposes. I'll just add those plates on to "The Never Ending List".

sweetk30 · 12-24-2017, 07:27 PM

o.k. just wanted to make sure you have it covered in 1 order .

12-24-2017, 04:14 PM	#1
robertsjm711 Registered User Join Date: Jul 2017 Location: Lebanon, Oregon Posts: 241	Axle on Leaf Spring Placement I have a 53 3100 with a S10 frame and 12 bolt axle and have a placement question. Does the axle center-line need to be lined up with the pin/bolt of the leaf springs? Can it me moved forward and inch or so with a new/modified bracket? When I moved the leaf spring mounts I did my best to center the wheels in the fenders, but they may be a little to the rear. Its not bad, but something others probably won't notice. Another reason is the length of driveshaft - many premade ones are maxed out from my axle to trans. The M20 I am using is a little shorter than other trans (so I have read) and don't want to use a jointed driveshaft. I have searched some on this - and either I am not using the right terminology or the images are not visible due to the photobucket thing. Thoughts? Attached Images __________________ It was said that if you cut off one hydra head, two more grow back. -Lernaean Hydra Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=743246

12-24-2017, 04:49 PM	#2
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: Axle on Leaf Spring Placement http://diy4x.com/product.php?product...cat=250&page=4 http://www.ruffstuffspecialties.com/...hantiwrap.html http://offroaddesign.com/catalog/14b...ingperches.htm here ya go . very comon in the off road world to do . some do 1" plus or minus . others do 1" or 1.5" and you weld it on what way you plan to move it . __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.

12-24-2017, 04:51 PM	#3
robertsjm711 Registered User Join Date: Jul 2017 Location: Lebanon, Oregon Posts: 241	Re: Axle on Leaf Spring Placement Perfect. This is exactly what I needed, thanks. __________________ It was said that if you cut off one hydra head, two more grow back. -Lernaean Hydra Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=743246

12-24-2017, 04:59 PM	#4
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: Axle on Leaf Spring Placement just make sure you get top plates to work with the axle moved . if 1 moves the other has to move . or the u-bolts will be at a crazy angle . __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.

12-24-2017, 05:02 PM	#5
robertsjm711 Registered User Join Date: Jul 2017 Location: Lebanon, Oregon Posts: 241	Re: Axle on Leaf Spring Placement Yes, the whole thing will move as a unit. The perches are only tacked onto the axle tube, I wasn't sure on the angle of the engine/trans to set the pinion angle so replacement/modification should be easy. __________________ It was said that if you cut off one hydra head, two more grow back. -Lernaean Hydra Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=743246

12-24-2017, 05:19 PM	#6
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: Axle on Leaf Spring Placement what i am saying is you need new u-bolt plates along with the perches that weld to the tube . if your center pin hole is no longer centered then the u-bolt plate needs the same off center in its self . = stock plates will NOT work anymore . http://diy4x.com/product.php?product...cat=250&page=4 http://www.ruffstuffspecialties.com/...25GM-UPLT.html http://offroaddesign.com/catalog/Rear%20U-Bolts.htm part way down the page is plates . __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.

12-24-2017, 05:34 PM	#7
robertsjm711 Registered User Join Date: Jul 2017 Location: Lebanon, Oregon Posts: 241	Re: Axle on Leaf Spring Placement Yes, we are on the same page. I need to get new U-bolts as the ones I have are old and off of who-knows-what. Just something laying around for mock up purposes. I'll just add those plates on to "The Never Ending List". __________________ It was said that if you cut off one hydra head, two more grow back. -Lernaean Hydra Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=743246

12-24-2017, 07:27 PM	#8
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: Axle on Leaf Spring Placement o.k. just wanted to make sure you have it covered in 1 order . __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.



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