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The front ends are different too. The B18 cars had smaller tie rod and drag link ends, different steering and idler arms, a smaller top ball joint and solid bushes in the lower A-arm. Valiant parts fit in place of the tie rods on a B18 car, which show how oversized the later model is! The steering parts are under tensile forces when driving forwards in a 140, but are suffering compression in a Valiant.
B20 cars got those parts enlarged + the inner bushes of the lower A-arms got a technology upgrade, they got bigger and the rubber got shifted to the working side leaving a gap in the other side. This makes the front end more supple and improves the brakes a lot! I would use poly in the top, but NOT in the bottom.
Springs: I'm 95% sure there was only one spring in the front of all 140's, a triple tempered piece that never sags. In the rear there are are double pig-tailed springs for years that go from '67 to '72 model cars with a different rating for 145's, a HD spring for 142-144's and a HD spring for 145's, so 4 different springs minimum. In the later cars with 240 style rear springs, '74-'75 142-144 single pig-tail in standard and HD springs + 145 standard and HD springs, so 4 more. So 8 springs at least + I'm not sure what is used in the '73 model and the early 240's have different spring ratings that go straight in.
No matter what car, I use stock front springs and bushes with stiffend lower A-arms, a few minor crossmember mods, Koni-D and a 22mm sway bar on a late B20 car frontend.
In the rear I use B18 trailing arms and torque rods for a 20 mm shorter wheelbase, improved weight distribution, stock bushes, Koni-D shocks, NO swaybar and standard '74 rear springs shimmed up to level. The only time I used a rear swaybar was when I locked the diff shut and then I only used a 16mm bar from a 240. This is with 205/60 medium grip tyres on my home made 15x7 Volvo rims. If you go to sticky low profile rubber on a bigger rim, and mostly use it at the track, I would use stiffer springs and Bilstiens, but I would not change the bars.
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69 142S Overdrive + 69 164S Manual
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