hurstscrambler Posted December 10, 2019 Share Posted December 10, 2019 I’ve got to get some fresh oil for the 8552A main and 8341c auxiliary transmissions in my truck. They are original to the 1969 IH I’m working on and I can’t really find any difinitive info on what I need for oil, I’d appreciate any guidance. I’ve searched the web, but there seems to be a lot of opinions. Thanks, Andy Quote Link to comment https://www.bigmacktrucks.com/topic/60136-oil-for-old-spicer-transmissions/ Share on other sites More sharing options...
Freightrain Posted December 10, 2019 Share Posted December 10, 2019 I run 50wt motor oil in my spicer 4spd. They typically don't take a thick grease. 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/60136-oil-for-old-spicer-transmissions/#findComment-437736 Share on other sites More sharing options...
Rob Posted December 10, 2019 Share Posted December 10, 2019 I have ran GL-4 90W in my auxiliaries and older Mack transmissions for many years. They say GL-5 will work nowadays but when it was first introduced, it liked to eat anything brass. GL-4 was common in the 60's and 70's and still readily available so I stay with it. Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/60136-oil-for-old-spicer-transmissions/#findComment-437743 Share on other sites More sharing options...
j hancock Posted December 10, 2019 Share Posted December 10, 2019 SAE 50W heavy duty engine oil is correct for both Spicer boxes. Synthetic is available but flush both boxes thoroughly if you go that route. https://spicerparts.com/en-emear/parts/lubricants/off-highway/sae-50-gear-lubricant Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/60136-oil-for-old-spicer-transmissions/#findComment-437752 Share on other sites More sharing options...
theakerstwo Posted December 10, 2019 Share Posted December 10, 2019 These boxes have needle brgs so dont use nothing any more than a 50w. 50W non detergent 2 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/60136-oil-for-old-spicer-transmissions/#findComment-437753 Share on other sites More sharing options...
hurstscrambler Posted December 11, 2019 Author Share Posted December 11, 2019 Cool, thanks guys. I appreciate the help, Andy Quote Link to comment https://www.bigmacktrucks.com/topic/60136-oil-for-old-spicer-transmissions/#findComment-437781 Share on other sites More sharing options...
Brian L Blaylock Posted December 11, 2019 Share Posted December 11, 2019 I have an old rebuild manual for the 8341 and it says use sae 30 motor oil Quote Link to comment https://www.bigmacktrucks.com/topic/60136-oil-for-old-spicer-transmissions/#findComment-437791 Share on other sites More sharing options...
Rob Posted December 11, 2019 Share Posted December 11, 2019 I've used non detergent SAE 30 oil in them without problems also. GL-4 90W gear lubricant and SAE-50 engine oil are the same viscosity on different scales. Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/60136-oil-for-old-spicer-transmissions/#findComment-437795 Share on other sites More sharing options...
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