Guest Luigi Posted April 22, 2003 Share Posted April 22, 2003 I tried a search but got a bunch of unrelated info. 1) are the front crossmembers for the 240,260&280 the same? 2)if not how can I tell them apart? 3) what is the difference in the steering racks for the same cars? 4) how can I tell them apart thanks luigi Quote Link to comment Share on other sites More sharing options...
Tim240z Posted April 22, 2003 Share Posted April 22, 2003 Don't know the specifics, but according to the MSA catalogue, there is a part number difference. 70-74 is the same, and 75-78 is the same. For the steering racks, the model ranges are: 70-73 and 74-78. Tim Quote Link to comment Share on other sites More sharing options...
Dave Posted April 22, 2003 Share Posted April 22, 2003 The 280 front crossmember is wider than 240-260 ones. The wider front crossmember may have started with the with the late 260's. Quote Link to comment Share on other sites More sharing options...
zcarnut Posted April 23, 2003 Share Posted April 23, 2003 There are two types of front crossmembers on the early Z cars, the 1970-73 one and the 1974-78 version. The later one was improved over the early one with two subtle changes: The steering rack mounts were reinforced with an additional plate on the bottom and they were also triangulated with a side brace. The two front crossmembers types are fully interchangeable. The steering rack also changed starting in early 1974. The steering ratio changed from 15.8 to 18.0, the rack housing material went from aluminum to cast iron, the pinion bearing went from a ball bearing and bushing combination to two separate ball bearings to reduce friction. The rack bushings were made wider and the inside diameter of the bushings increased sightly. The Zerk type grease fittings were no longer used and finally the steering rack boots were attached with a screw clamp instead of a rubber snap ring. The early and later steering racks are also interchangeable provided you use the corresponding bushings. Both the front crossmember and the steering were changed in 1974 (along with numerous other changes) because of the introduction of the heavier 2+2 260Z. Quote Link to comment Share on other sites More sharing options...
jbeech Posted April 23, 2003 Share Posted April 23, 2003 What's the serial number or manufcaturing date cutoff between early and late 74 Z-cars? Quote Link to comment Share on other sites More sharing options...
Guest thepenguin99 Posted April 23, 2003 Share Posted April 23, 2003 dont know the date but early 74 cars have thin 240 style bumpers and late ones have thick 280z bumpers Quote Link to comment Share on other sites More sharing options...
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