Red Horse Posted May 16, 2019 Share Posted May 16, 2019 Kind of late for me to be asking this question but what is best gear lube for a Duplex (TRD 720) and a CRD-62 Rear Quote Link to comment https://www.bigmacktrucks.com/topic/57233-proper-gear-lubes-b-61x/ Share on other sites More sharing options...
j hancock Posted May 16, 2019 Share Posted May 16, 2019 OEM for the transmission was GO-B90 which was a mild extreme pressure gear oil. The rear used GO-D90 which was a multi purpose oil. Lots of brands out there so pick your favorite. For hobby use and an occasional trip to the pit, probably could use something like Mobilube HD Plus 80W-90 in both. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/57233-proper-gear-lubes-b-61x/#findComment-422888 Share on other sites More sharing options...
Freightrain Posted May 16, 2019 Share Posted May 16, 2019 I've put regular 75w90 stuff in my truck. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/57233-proper-gear-lubes-b-61x/#findComment-422894 Share on other sites More sharing options...
terry Posted May 16, 2019 Share Posted May 16, 2019 (edited) 4 hours ago, Freightrain said: I've put regular 75w90 stuff in my truck. I know you have made comments about your trans. being noisey, what if you tried some heavier gear oil? Not a cure but might help. terry Edited May 16, 2019 by terry Quote Link to comment https://www.bigmacktrucks.com/topic/57233-proper-gear-lubes-b-61x/#findComment-422911 Share on other sites More sharing options...
Freightrain Posted May 16, 2019 Share Posted May 16, 2019 I've tried a few different things, even some Lucas. It just has loose bearing kinda noise. Years back, when I converted to electronic speedo and had the rear tailhousing off, I pulled a shim from the cover to tighten that rear bearing up. Seem to help more then anything. Under load, it's okay. Just coasting it rattles and clanks along. You can feel the noise in the back box up through the compound shifter. I rebuilt the handles over the winter which helped the shift pattern overall. But the compound handle still buzzes going down the highway. I typically keep my hand on my leg with my finger pushing on the handle to quiet it down. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/57233-proper-gear-lubes-b-61x/#findComment-422914 Share on other sites More sharing options...
terry Posted May 16, 2019 Share Posted May 16, 2019 Have ever checked end play on the counter shaft through a PTO opening real easy to check and adjust with the removal of shims on the back of countershaft bearing cover. terry Quote Link to comment https://www.bigmacktrucks.com/topic/57233-proper-gear-lubes-b-61x/#findComment-422931 Share on other sites More sharing options...
Maddog13407 Posted May 17, 2019 Share Posted May 17, 2019 must be a triplex thing.... I rest my leg against mine...…. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/57233-proper-gear-lubes-b-61x/#findComment-422950 Share on other sites More sharing options...
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