Disco driv­e­line

LRO (UK) - - Heritage | How The Disco 2 Was Born -

07Ma­jor im­prove­ments to the orig­i­nal Dis­cov­ery driv­e­line were made for the new gen­er­a­tion. The five-speed R380 gear­box was re­tained but up­rated to suit the in­creased torque of the new en­gines. And it was mod­i­fied to im­prove its some­what du­bi­ous qual­ity and re­li­a­bil­ity record. The au­to­matic gear­box was the fa­mil­iar ZF4HP22 but now had a new so­phis­ti­cated elec­tronic con­trol sys­tem. A ‘mode’ but­ton pro­vided a ‘sport’ mode in high range and manual over­ride in low range for more con­trol, in­clud­ing an anti-stall down­shift func­tion. A di­rect elec­tronic link to the en­gine ini­ti­ated a mo­men­tary torque re­duc­tion dur­ing gearshifts to im­prove change qual­ity.

Both units were cou­pled to the LT230Q trans­fer box – the ‘Q’ suf­fix mean­ing ‘Quiet’, brought about by im­prove­ments to re­fine­ment. It was iso­lated from the cabin by a ca­ble in­stead of a link­age. With the ad­vent of ETC, driver con­trol of the cen­tre diff was re­moved, though it could still be locked for work­shop use.

The wider track axles ben­e­fited from im­prove­ments made for the P38; the front had open yokes to al­low greater steer­ing pre­ci­sion.

The Dis­cov­ery 2 trans­mis­sion was much im­proved over that of the orig­i­nal. The au­to­matic gear­box now fea­tured the abil­ity to en­gage a sport set­ting in high range and manual over­ride in low range for bet­ter off-road con­trol.

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