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Re: [TR] TR4A IRS Suspension Question

To: Michael Marr <mmarr@albiontechnical.com>, Jim Henningsen <trguy75@gmail.com>, "triumphs@autox.team.net" <triumphs@autox.team.net>
Subject: Re: [TR] TR4A IRS Suspension Question
From: Michael Marr <mmarr@albiontechnical.com>
Date: Wed, 24 Mar 2021 01:17:41 +0000
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Thread-topic: [TR] TR4A IRS Suspension Question
Another thought.  On my TR3A, there is a spacer on one of the rear springs 
that, effectively, increases the unloaded ride height on the driver's side to 
account for the fact that the car is driven driver-only most of the time.  Does 
the same situation exist with the 4A?  Is one rear spring longer than the other 
to provide the ride height difference?  Have you tried measuring the ride 
height with someone (an adult, preferably) in the driver's seat?

Mike

Michael J Marr, P.E., CEng.
Albion Technical Services
W5918 Hackbarth Rd
Fort Atkinson, WI 53538

Cell:  630-202-0065
Email:  mmarr@albiontechnical.com

-----Original Message-----
From: Triumphs <triumphs-bounces@autox.team.net> On Behalf Of Michael Marr
Sent: Tuesday, March 23, 2021 8:03 PM
To: Jim Henningsen <trguy75@gmail.com>; triumphs@autox.team.net
Subject: Re: [TR] TR4A IRS Suspension Question

Have you driven the car?  A few road miles will help the suspension settle.  
There's a lot of "stiction" in those new components.

Also, I agree with Jim Kirby - the new shocks will not affect ride height, 
unless, for some reason, they have bottomed out and are bound up.

Mike

Michael J Marr, P.E., CEng.
Albion Technical Services
W5918 Hackbarth Rd
Fort Atkinson, WI 53538

Cell:  630-202-0065
Email:  mmarr@albiontechnical.com

-----Original Message-----
From: Triumphs <triumphs-bounces@autox.team.net> On Behalf Of Jim Henningsen
Sent: Tuesday, March 23, 2021 7:06 PM
To: triumphs@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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