ronhatch Posted March 9, 2021 Report Share Posted March 9, 2021 Hi all, on my new rebuild (mark 2, productivity is up this year ) I scrapped the old early chassis as it was full of rust and I picked up a good late tr4 chassis, I intend to use all the old running gear but I need to change the steering rack which I have obtained. I read about the different lengths and when compared side by side the later one is shorter, can I use the old pin and balls so that it is compatible with the old steering gear ? Regards Ron Quote Link to post Share on other sites
stuart Posted March 9, 2021 Report Share Posted March 9, 2021 Its the length of the inner rod ends that makes the difference, If your using a late TR4 chassis you need the late housing and the long inner rods. Stuart. Quote Link to post Share on other sites
ronhatch Posted March 9, 2021 Author Report Share Posted March 9, 2021 Hi Stuart, thanks for the reply, is this the part that the track rod ends screw on to ? part number 128023 in the rimmers book ? Regards Ron Quote Link to post Share on other sites
stuart Posted March 9, 2021 Report Share Posted March 9, 2021 Sorry dont use Rimmers, its item 95 here Steering rack. Stuart. Quote Link to post Share on other sites
ronhatch Posted March 9, 2021 Author Report Share Posted March 9, 2021 18 minutes ago, stuart said: Sorry dont use Rimmers, its item 95 here Steering rack. Stuart. Cheers Quote Link to post Share on other sites
Malbaby Posted March 9, 2021 Report Share Posted March 9, 2021 As a matter of interest, where are the chassis different that necessitates changes in the R&P length. Quote Link to post Share on other sites
PaulAnderson Posted March 9, 2021 Report Share Posted March 9, 2021 As a slight drift I just want to add that in just about every post I’ve looked at tonight in the 4/4A and Technical forums Stuart has posted a helpful response. Thanks Stuart for passing on your experience and knowledge to all. It also keeps us all going in these difficult times. Paul Quote Link to post Share on other sites
Z320 Posted March 9, 2021 Report Share Posted March 9, 2021 +1 Quote Link to post Share on other sites
stuart Posted March 10, 2021 Report Share Posted March 10, 2021 13 hours ago, Malbaby said: As a matter of interest, where are the chassis different that necessitates changes in the R&P length. Yes the early TR4 rack is mounted higher than the later one. Stuart. Quote Link to post Share on other sites
ianc Posted March 10, 2021 Report Share Posted March 10, 2021 The early TR4 rack is mounted on a pair of uprights (see photo). Disregard the pair of braces dropping downwards from the cross tube - that is a strengthening modification devised by Ray Henderson for the Works' TR4 Rally cars. The U bolts for the rack clamp where the pairs of bolts are seen here. Ray's modification makes the mounting extremely strong, but getting the nuts onto the U bolts is not easy, even for someone with small hands! Ian Cornish Quote Link to post Share on other sites
ronhatch Posted March 10, 2021 Author Report Share Posted March 10, 2021 Hi Stuart, if the old rack needs to be longer because it is mounted higher does that mean if I use a later chassis and a later rack to suit it wont need the inner rods changing ? Regards Ron Quote Link to post Share on other sites
stuart Posted March 10, 2021 Report Share Posted March 10, 2021 2 minutes ago, ronhatch said: Hi Stuart, if the old rack needs to be longer because it is mounted higher does that mean if I use a later chassis and a later rack to suit it wont need the inner rods changing ? Regards Ron No there is several different racks and you need the right one to suit application, see here Steering racks Stuart.. Quote Link to post Share on other sites
ronhatch Posted March 10, 2021 Author Report Share Posted March 10, 2021 Ok thanks Stuart Quote Link to post Share on other sites
Malbaby Posted March 10, 2021 Report Share Posted March 10, 2021 Ditto. Quote Link to post Share on other sites
BlueTR3A-5EKT Posted March 10, 2021 Report Share Posted March 10, 2021 Do not forget the steering levers fixed to the front suspension changed 3 times on TR4. Peter W Quote Link to post Share on other sites
Malbaby Posted March 11, 2021 Report Share Posted March 11, 2021 That's another variation to the steering geometry. Quote Link to post Share on other sites
Motorsport Mickey Posted March 11, 2021 Report Share Posted March 11, 2021 (edited) Fit what you want, just adjust the bump steer afterwards. The original geometry is c r a p anyway. Mick Richards Edited March 11, 2021 by Motorsport Mickey Quote Link to post Share on other sites
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