youngstown.bulldog80 Posted July 9, 2019 Share Posted July 9, 2019 Attempting to identify a couple main/aux transmission setups. The ID tags are as follows: Main - Fuller 5H74T, Aux - 8031e....I'm guessing that the main is simply a 5 speed direct in 5th (looks like single countershaft), but is the 8031e an old spicer 3 speed aux transmission? Quote Link to comment https://www.bigmacktrucks.com/topic/58046-mainaux-transmission/ Share on other sites More sharing options...
tl1975 Posted July 9, 2019 Share Posted July 9, 2019 It's been a while since I've been exposed to anything with 2 sticks, but I believe you're correct about the auxiliary transmission being a 3 speed. But look closer at the tag, because it may say 8031C instead of E. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/58046-mainaux-transmission/#findComment-427378 Share on other sites More sharing options...
youngstown.bulldog80 Posted July 10, 2019 Author Share Posted July 10, 2019 6 hours ago, tl1975 said: It's been a while since I've been exposed to anything with 2 sticks, but I believe you're correct about the auxiliary transmission being a 3 speed. But look closer at the tag, because it may say 8031C instead of E. Will do thanks! Quote Link to comment https://www.bigmacktrucks.com/topic/58046-mainaux-transmission/#findComment-427416 Share on other sites More sharing options...
Truck Shop Posted July 10, 2019 Share Posted July 10, 2019 Three speed that has a low torque rating of 675 to 775 I believe. 1 Quote One ping only Link to comment https://www.bigmacktrucks.com/topic/58046-mainaux-transmission/#findComment-427424 Share on other sites More sharing options...
Freightrain Posted July 10, 2019 Share Posted July 10, 2019 (edited) Typically the first two digits are the torque rating(80= 800 ft/lbs). The 3 is three speeds. Not sure what the "1" denotes. The letter is typically the gear ratio. I used to have a Spicer sheet saved that listed everything. Found this: AUXILIARY TRANSMISSION: Spicer 8031G, 8035G; reductions: 1.29, 1.00, .84. 8031C, 2.59, 1.00, .75. 8341A, 2.40, 1.29, 1.00, .84 Edited July 10, 2019 by Freightrain 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/58046-mainaux-transmission/#findComment-427436 Share on other sites More sharing options...
Hobert62 Posted July 11, 2019 Share Posted July 11, 2019 If I remember I think the 1 at the end means steel case a 2 would be aluminum. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/58046-mainaux-transmission/#findComment-427505 Share on other sites More sharing options...
Hobert62 Posted July 11, 2019 Share Posted July 11, 2019 1 Quote Link to comment https://www.bigmacktrucks.com/topic/58046-mainaux-transmission/#findComment-427506 Share on other sites More sharing options...
tl1975 Posted July 13, 2019 Share Posted July 13, 2019 On 7/9/2019 at 7:59 AM, youngstown.bulldog80 said: Attempting to identify a couple main/aux transmission setups. The ID tags are as follows: Main - Fuller 5H74T, Aux - 8031e....I'm guessing that the main is simply a 5 speed direct in 5th (looks like single countershaft), but is the 8031e an old spicer 3 speed aux transmission? That Fuller 5H74T you mention, it's an ancient 5 speed transmission, I think it pre-dates the T905 series. It's very small (if I'm remembering correctly), and I don't even think you can get internal parts for those anymore. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/58046-mainaux-transmission/#findComment-427715 Share on other sites More sharing options...
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