Red Horse Posted August 30, 2012 Share Posted August 30, 2012 Anyone have an opinion on this transmission I think its a double OD quad box with an aluminum case. True?? If so, how do you think it would hold up behind a 237 Maxidyne? You may recall I've posted before about trying to solve my 6.67 CRD -62 problem as my direct Duplex gives me no road speed.Instead of finding a gear set for the rear, I'm thinking the transmission swap is a better way to solve the problem.Appreciate any thoughts. Quote Link to comment https://www.bigmacktrucks.com/topic/27078-trql-7220/ Share on other sites More sharing options...
David Posted August 30, 2012 Share Posted August 30, 2012 A Maxidyne can handle the big steps of a T200 5,6,7,or 8 speed. These transmissions also have the fastest overdrive available (.6). With 6.62 rears and 1100x22.5 (same as 1000x20) you should get 60mph at 2000rpm. Quote Link to comment https://www.bigmacktrucks.com/topic/27078-trql-7220/#findComment-135636 Share on other sites More sharing options...
Maddog13407 Posted August 31, 2012 Share Posted August 31, 2012 yea that transmission will work and might get you 65mph as long as u baby it. if you hot rod it they will spin a single disk clutch and if you lug it too much in high gear you could break 5th gear and crack the case. seen a guy blow the whole back half of a triplex apart before behind a 237 Quote Link to comment https://www.bigmacktrucks.com/topic/27078-trql-7220/#findComment-135674 Share on other sites More sharing options...
Red Horse Posted August 31, 2012 Author Share Posted August 31, 2012 yea that transmission will work and might get you 65mph as long as u baby it. if you hot rod it they will spin a single disk clutch and if you lug it too much in high gear you could break 5th gear and crack the case. seen a guy blow the whole back half of a triplex apart before behind a 237I hear you on breaking it-but don't I run the same risk with a Diplex in the back section?And yes Jim-24" wheels. Quote Link to comment https://www.bigmacktrucks.com/topic/27078-trql-7220/#findComment-135680 Share on other sites More sharing options...
fifth wheel Posted August 31, 2012 Share Posted August 31, 2012 Any single countershaft transmission will work but not for long behind a 237.FW Quote Link to comment https://www.bigmacktrucks.com/topic/27078-trql-7220/#findComment-135687 Share on other sites More sharing options...
Maddog13407 Posted August 31, 2012 Share Posted August 31, 2012 it will work as well as a duplex as long as u dont pound it. Doug Fetterly has ran a Monoshift behind his 237 for years. Quote Link to comment https://www.bigmacktrucks.com/topic/27078-trql-7220/#findComment-135704 Share on other sites More sharing options...
Red Horse Posted August 31, 2012 Author Share Posted August 31, 2012 Thx guys for your comments. Truck had its 711 replaced with a 237 in '79 by the guy aI bought it from and he used it in his excavating business until I bought it. So the Duplex has done well. My biggest concern with the "L" version of a quad box is the strength of the aluminum case-which as with all aluminum components-it was chosen as a weight savings-at a very premium price- but was engineered to be as durable as the cast versions-I hope! Quote Link to comment https://www.bigmacktrucks.com/topic/27078-trql-7220/#findComment-135742 Share on other sites More sharing options...
Maddog13407 Posted August 31, 2012 Share Posted August 31, 2012 should not have any problems with the case. the aluminum bell housing on the transmissions were junk tho. never seen one that was not cracked. must have been all the torque of the 673's haha Quote Link to comment https://www.bigmacktrucks.com/topic/27078-trql-7220/#findComment-135761 Share on other sites More sharing options...
REO Posted September 2, 2022 Share Posted September 2, 2022 I know this is a very old thread but I have a question. Could the steel bellhousing from a trq7220 be fitted to a trql7220? this would be behind a 237 with a double disk push type clutch. it appears the biggest stress on the aluminum bellhousing was the weight of the trans with no rear support? Quote Link to comment https://www.bigmacktrucks.com/topic/27078-trql-7220/#findComment-508255 Share on other sites More sharing options...
terry Posted September 2, 2022 Share Posted September 2, 2022 If your using a double disc clutch, it has to be the deeper bell housing, not sure if they had the deeper one in aluminum. Terry Quote Link to comment https://www.bigmacktrucks.com/topic/27078-trql-7220/#findComment-508272 Share on other sites More sharing options...
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