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63 to 64 rear suspension
Posted by: Early Guy ()
Date: April 13, 2017 09:30PM

I am in the final stages of converting my 63 Spyder to 64 rear suspension I installed the 64 diff a couple years ago and have been acquiring the necessary parts. Since my control arms are in great shape blasted painted and all I am going to modify by cutting and drilling holes for the leaf spring links. I was able to make a drilling template so thats not an issue. I know there is a reinforcement inside to support the 3 studs but I cant tell what shape it is has anyone done this or maybe a picture or description of the inside support plate. Thanks for any help.


Ray Johnson Villa Park IL 63 Spyder Conv. 140 EFI

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Re: 63 to 64 rear suspension
Posted by: Wagon Master ()
Date: April 14, 2017 10:04AM

It looks alot like the plastic 3 hole piece the goes under the horn ring retainer bolts. Only made out of steel.

'64 Monza Coupe 140 4 speed
'61 700 Lakewood 95 4 speed
'69 Monza Convert. 140 Auto.

Been aircooled since 1973
Northwest Ohio

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Re: 63 to 64 rear suspension
Posted by: Early Guy ()
Date: April 14, 2017 10:52AM

Ok thanks good description. I plan to make the plate and weld three bolts to it and drop in from the inside.


Ray Johnson Villa Park IL 63 Spyder Conv. 140 EFI

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Re: 63 to 64 rear suspension
Posted by: Wagon Master ()
Date: April 14, 2017 11:07AM

Don't forget to add the 1964 specific coil springs also. I've seen that error several times.

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Re: 63 to 64 rear suspension
Posted by: Early Guy ()
Date: April 16, 2017 08:02PM

Thanks for the tips. Ive had most of the parts including the new coils waiting the one detail I hadn't thought of was transmission mounts I was informed by Larry Claypool that the 64 mounts are designed differently than the other EMs because there is an upward force from the center leaf pushing on the diff case.I was able to use the CNC mill at work to accurately place and cut the cushion hole as well as the 3 bolt pattern.should have it on the ground next weekend.


Ray Johnson Villa Park IL 63 Spyder Conv. 140 EFI

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Re: 63 to 64 rear suspension
Posted by: 63Darrin ()
Date: April 19, 2017 07:05PM

It would be a lot easier and cheaper to add an aftermarket rear sway bar from Addcco. It will also handle a lot better than the leaf spring. I was going to do the same thing but changed my mind. I will be using the '64 diff when my 140 is finished.

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Re: 63 to 64 rear suspension
Posted by: Early Guy ()
Date: April 24, 2017 11:38AM

Thanks all for your input project done everything bolted up nicely went for test drive yesterday initial thoughts is cornering is flatter oddly I previously had minor issues with front (205/60-15s) scraping slightly on bump turns that seems to be gone. Maybe related to rear now a little higher do to new coils.


Ray Johnson Villa Park IL 63 Spyder Conv. 140 EFI

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Re: 63 to 64 rear suspension
Posted by: 66vairman ()
Date: April 24, 2017 12:48PM

63Darrin Wrote:
-------------------------------------------------------
> It would be a lot easier and cheaper to add an
> aftermarket rear sway bar from Addcco. It will
> also handle a lot better than the leaf spring. I
> was going to do the same thing but changed my
> mind. I will be using the '64 diff when my 140 is
> finished.

What I've read about the old "camber compensators" vs. the GM 64 leaf spring design always states the factory 64 rear suspension worked better and it also lowered the rear roll center. Typically rear sway bars don't work well on rear engine cars unless used for a specific track condition. Don't confuse "flat" cornering with good cornering, not necessarily so.

Anybody here familiar with the Addco sway bar vs. the 64 suspension.

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Re: 63 to 64 rear suspension
Posted by: robert wilkinson ()
Date: April 24, 2017 03:30PM

Anybody here familiar with the Addco sway bar vs. the 64 suspension?

A sway bar is just the opposite of the 64 transverse leaf spring. Sway bars add roll stiffness. A transverse spring with a center pivot (as on Corvair--different from Corvette) has zero roll stiffness. There is still roll stiffness due to the coil springs, but because they are lighter than those before 64, there is a net decrease in rear roll stiffness.

For street driving with swing axles, you want lots of roll stiffness at the front and none or very little at the rear. IMHO and in GM's HO.

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Re: 63 to 64 rear suspension
Posted by: mwr ()
Date: April 24, 2017 04:14PM

robert wilkinson Wrote:
-------------------------------------------------------
> A sway bar is just the opposite of the 64
> transverse leaf spring. Sway bars add roll
> stiffness. A transverse spring with a center pivot
> (as on Corvair--different from Corvette) has zero
> roll stiffness. There is still roll stiffness due
> to the coil springs, but because they are lighter
> than those before 64, there is a net decrease in
> rear roll stiffness.
>
> For street driving with swing axles, you want lots
> of roll stiffness at the front and none or very
> little at the rear. IMHO and in GM's HO.


+1 to all of the above



Edited 1 time(s). Last edit at 04/24/2017 04:14PM by mwr.

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Re: 63 to 64 rear suspension
Posted by: MattNall ()
Date: April 24, 2017 05:05PM

You can read all about it in my Techpages or Bryan's Autocross Pages...

Warren Le Veque's "Solo IS"





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