TR4A/TR250/TR6 Front Suspension
Repair and Rebuild by Chris Lillja With input from Henry Frye, Cameron Greig and Roger G. Bolick.
Several people have asked about the inherent weaknesses of the TR4A/TR250 front suspension. Bill Piggot warns of it in “Original Triumph TR”, the TRF catalog mentions it, and Kas Kastner devotes a considerable section of the “TR4/4A Competition Preparation Manual” to it.
One VTR list serve member commented: “.I remember a number of bad accidents here in the U.K. in the late 70s early 80s when people were fitting over sized wheels and tyres. One accident I remember resulted in three deaths when the front suspension collapsed and the car turned over and burst into flames. The suspension is weak enough without the additional strain of larger wheels.”
Basically the problem is this: on the TR4 and previous cars, the front lower suspension pivots are built right into the chassis frame. This design is incredibly strong, but very difficult to adjust for camber -short of using a welding torch to heat and BEND the frame. It’s also much more difficult to repair accident damage. Triumph engineers also felt that the roll center needed to be modified. Their solution was to add four upright brackets fore and aft of the front suspension towers. “U” shaped pivot brackets bolt to these frame