JUNKMAN33 Posted April 10, 2016 Share Posted April 10, 2016 I have b61 mack that need a little more top end it has end 673 and a 10 speed I have lived with it quite while but the starter ring has lost a few teeth so I got to pull the trans good time to make change does know what would help it I don't pull heavy load just antique tractor and car to shows thank junkman Quote Link to comment https://www.bigmacktrucks.com/topic/44740-mack-trans-1958-b-61/ Share on other sites More sharing options...
tjc transport Posted April 10, 2016 Share Posted April 10, 2016 to get more speed from a trans swap, you will need a trans with an overdrive gear. or change the rear gear ratio. Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment https://www.bigmacktrucks.com/topic/44740-mack-trans-1958-b-61/#findComment-330018 Share on other sites More sharing options...
thomastractorsvc Posted April 13, 2016 Share Posted April 13, 2016 See if you can find an aux gear box Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/44740-mack-trans-1958-b-61/#findComment-330235 Share on other sites More sharing options...
Freightrain Posted April 14, 2016 Share Posted April 14, 2016 (edited) Another box will take some frame length. What is the wheelbase now? What model 10 spd? TRDxxx? Is it overdrive? What is your current ratio out back? 5.xx? Need to get it into the 4's. An OD trans with 4.62 rear will get you 65 mph on the floor. Edited April 14, 2016 by Freightrain Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/44740-mack-trans-1958-b-61/#findComment-330387 Share on other sites More sharing options...
hicrop10 Posted April 14, 2016 Share Posted April 14, 2016 My B87 has a 5 speed with an aux.trans and 9.10 ratio and I top at at 72.Now my mpg was around 4-5 empty and about 2-3 loaded. Quote Link to comment https://www.bigmacktrucks.com/topic/44740-mack-trans-1958-b-61/#findComment-330393 Share on other sites More sharing options...
terry Posted April 14, 2016 Share Posted April 14, 2016 (edited) 1 hour ago, hicrop10 said: My B87 has a 5 speed with an aux.trans and 9.10 ratio and I top at at 72.Now my mpg was around 4-5 empty and about 2-3 loaded. I would like to see what you have for a tranmission! A double overdrive with 9.10 rears might run 50 Edited April 14, 2016 by terry Quote Link to comment https://www.bigmacktrucks.com/topic/44740-mack-trans-1958-b-61/#findComment-330396 Share on other sites More sharing options...
hicrop10 Posted April 15, 2016 Share Posted April 15, 2016 My main trans is aTR1310 with a 3 speed aux. trans. Quote Link to comment https://www.bigmacktrucks.com/topic/44740-mack-trans-1958-b-61/#findComment-330422 Share on other sites More sharing options...
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