Andy & Sumner,
Doing a side by side comparison of TR4 and TR3A seat frames there are
noticeable differences. The most obvious difference is the large
rectangular dent in the the TR4 seat bottom pans. The second difference
that I am aware of is the distance between holes for mounting the seat to
the adjuster tracks. The TR4 seat pan uses two different different seat
adjuster tracks, inner and outer. The outer one has a distance of 14.25"
between mounting studs that stick up into the seat pans while the inner
track has 13.75" between mounting studs. The TR3A requires 13" between
mounting studs.
Now, the where the seat adjuster tracks bolt to the tubs there is also a
difference. The TR3A has 14.5" between the mounting holes in the body
tub where as the TR4 has 15" between mounting studs. If they used the
TR4 style of seats and adjusters in the TR3B at any time they would have
had to relocate two of the mounting holes for each seat. Hopefully
someone can tell us what type of seats and seat tracks are used in their
later TR3B.
So for those of you trying to locate the proper seats for your project be it
TR3A/B or early TR4 will need to also find the proper seat adjuster tracks.
That in itself might prove to be more difficult to find than the seats
themselves, right Brian S. !!
Hope this helps.
Brad (Lincoln Nebraska 402-464-1502)
My Web Site Http://www.141.com/triumphs (updated 2/15/99)
1964 Spitfire4 BFC25720L
1962 TR4 CT288L -- 1965 TR4 CT38888LO parts car?
1959 TR3A TS41311L -- 1959 TR3A TS53523L parts car
1951 1/2 ton Dodge Truck B-3-B-108
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