michaelmunro7 Posted October 18, 2013 Share Posted October 18, 2013 If a 18 speed transition has about 28:1 in reverse then am I able to change my 9 speed internals to achieve that same bull gear reverse of the 18 speed, assuming the main boxes are the same, maybe by changing the counter shafts or a gear or two. Ps any comments on how would be great Quote Link to comment https://www.bigmacktrucks.com/topic/33180-mack-9-speed-transmition-reverse-raitos-versus-18-speed/ Share on other sites More sharing options...
fullfuel01 Posted October 18, 2013 Share Posted October 18, 2013 Older 18 had lower speed in reverse. In 97-98, according to the truck I have, they speeded them up a bit. One of the xxx update they did. Quote Link to comment https://www.bigmacktrucks.com/topic/33180-mack-9-speed-transmition-reverse-raitos-versus-18-speed/#findComment-212214 Share on other sites More sharing options...
Dirtymilkman Posted October 18, 2013 Share Posted October 18, 2013 Actually you could and still can get the 18 with two different reverse ratios. There's a low geared one in reverse and a normal one. I have both versions and I prefer the low ones. Quote Link to comment https://www.bigmacktrucks.com/topic/33180-mack-9-speed-transmition-reverse-raitos-versus-18-speed/#findComment-212218 Share on other sites More sharing options...
michaelmunro7 Posted October 19, 2013 Author Share Posted October 19, 2013 I was trying 2 make the 9 speed slow in reverse like the 18 speed and wondering how and if it could b done Quote Link to comment https://www.bigmacktrucks.com/topic/33180-mack-9-speed-transmition-reverse-raitos-versus-18-speed/#findComment-212324 Share on other sites More sharing options...
mackdaddy Posted October 31, 2013 Share Posted October 31, 2013 I tried to go back to another thread on the T2090 and it would not allow me to post? just kept saying that it was saving the post? Anyways, I picked up a MH with the T2090 and it shifts just fine but when sitting there idling the tranny sure has some clunking noise to it. Pulled the plug and no signs of metal. is this a common noise? Quote Link to comment https://www.bigmacktrucks.com/topic/33180-mack-9-speed-transmition-reverse-raitos-versus-18-speed/#findComment-214260 Share on other sites More sharing options...
Back In Black Pulling Posted October 31, 2013 Share Posted October 31, 2013 My 9 speed always clunks at idle , i believe the 9 in the other truck also clunked . Quote Link to comment https://www.bigmacktrucks.com/topic/33180-mack-9-speed-transmition-reverse-raitos-versus-18-speed/#findComment-214321 Share on other sites More sharing options...
BAD DOG Posted November 1, 2013 Share Posted November 1, 2013 I had an MH with an E9 400 I bought for parts a few years back and it had a 9 speed Mack tranny it shifted good was good going down the road but it made a clunking noise too when the truck sat idling. I never found anything in the oil in it either, maybe it's just the nature of them. Quote Link to comment https://www.bigmacktrucks.com/topic/33180-mack-9-speed-transmition-reverse-raitos-versus-18-speed/#findComment-214364 Share on other sites More sharing options...
mackdaddy Posted November 1, 2013 Share Posted November 1, 2013 Thanks for the response and I think it must just be unique to the T2090. Quote Link to comment https://www.bigmacktrucks.com/topic/33180-mack-9-speed-transmition-reverse-raitos-versus-18-speed/#findComment-214537 Share on other sites More sharing options...
rsb502 Posted November 5, 2013 Share Posted November 5, 2013 When you ask about ratios which transmissions are you talking about, the Maxitorque T309 has a 13.31 low reverse and the T309LR has a 24.24, the T318 has a 15.91 and the T318LR has a 28.98, I cant find my info on the T2090. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/33180-mack-9-speed-transmition-reverse-raitos-versus-18-speed/#findComment-215249 Share on other sites More sharing options...
j hancock Posted November 6, 2013 Share Posted November 6, 2013 T2090 is 10.69 for Lo and .71 for 8th. Reverse of 10.92.T2090B is 11.80 for Lo and .71 for 8th. Reverse 10.92. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/33180-mack-9-speed-transmition-reverse-raitos-versus-18-speed/#findComment-215269 Share on other sites More sharing options...
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