[TR] TR4A IRS Suspension Question

[Jeff Scarbrough]

Is it also possible to measure to a different reference, like the
frame?  Could a 1/2" difference be due to factory assembly rather than
suspension?

On Tue, Mar 23, 2021 at 8:18 PM Steve Kirby <sackirby at chinaautogroup.com> wrote:
>
> Jim
>
> Others may be able to offer you more insight, but you should keep in mind that shock absorbers do no influence ride height because they bear no weight.  The "gas" in gas shocks is insufficient to raise the weight of your car (after all, you can compress the shocks by hand).  If your rear ride height changed it was due to other factors.
>
> In a race car, the first thing that the builder would do would be to weigh all four corners.  If the LF of the car weighs more than the RF, then the car will not sit level on exactly the same suspension components.
>
> Steve Kirby
> President
> China Auto Group
> 22831 Avenida Empresa
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> -----Original Message-----
> From: Triumphs <triumphs-bounces at autox.team.net> On Behalf Of Jim Henningsen
> Sent: Tuesday, March 23, 2021 5:06 PM
> To: triumphs at autox.team.net
> Subject: [TR] TR4A IRS Suspension Question
>
> Ok, just finished redoing front and rear suspension on my 67 4A IRS.
> Complete disassembly, clean, repaint, new urethane bushings, tie rod ends, trunnions, etc.  New comp springs ( 1 inch lower) all corners, new stock tubes shocks up front and new KYB gas shocks on the tube shock conversion brackets for the IRS.  Reinstalled all alignment shims as installed as the car drove pretty straight.  Urethane packings on springs.
>
> After completing, I noticed that all four corners have a slightly different ride height when measured from garage floor to bottom on fender lip at center of each wheel.  Left front: 26 3/4 inches, Right front: 26 1/4, Left
> rear: 27 3/8, right rear: 27 7/8.  I think the higher rear height is coming
> from the tube shock conversion as it was lower with the levers.    So about
> a half inch off each side.   I don't recall having this issue when I redid
> my TR6, but that was a while ago.   Rears also have stock trailing arm
> brackets (one and two notch brackets on each side - believe these are original from new given history of the car).
>
> Looking for help on next steps before bringing it in for an alignment.  Will alignment correct height difference or do I need to add 1/2 inch spacers on lower sides.  I am going to put uprated valved levers back on rear to eliminate the extra height in rear.
>
> Any help appreciated.
>
> Thanks
> Jim Henningsen
> Ocala FL
> Too many TRs to maintain!
> 61 3A
> 62 4
> 67 4A
> 75 6
> 81 8
>
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