reb78 Posted July 26, 2010 Share Posted July 26, 2010 I think it's the regular maintenance which makes the difference. Overdrives do get hot when engaged and can cook the ATF used in GKN units - regular replacement is very wise. Roverdrives also get hot and can quickly degrade mineral EP90, which it shares from the transfer box, so using semi-synthetic 75W90 is better. I agree. I change my GKN OD oil at every service now. I've also fitted a deeper sump (from RMS) to my transfer box with fins in the hope that the extra oil and cooling fins will help keep that portion of the transmission and hence the OD cooler. I wondered if MTF 94 might be better for the OD than ATF, but devon 4x4 seemed to think not. Quote Link to comment Share on other sites More sharing options...
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