Joy2all Posted October 19, 2006 Share Posted October 19, 2006 We have a chance to purchase a R686T Mack truck for $2000.00Where can I find info on these models.....The B model site has me spoiled I guess....lolAny help is appreciated greatly....its suppose to be 1981 year.....Thanks a bunchJoy Quote Link to comment https://www.bigmacktrucks.com/topic/1631-am-i-old-or-new/ Share on other sites More sharing options...
fullfuel01 Posted October 20, 2006 Share Posted October 20, 2006 depend of the engine, tranny... 81 got small cab and old fuel tank etc... worth less then 86 and up. it also depend of the quality of the truck, if it's a truck that have been abused for years or a truck maintened for years! take a look at the frame, double frame with the time open and crack... but 2000$ if the truck is plated and inspected, it seems to be nice... Quote Link to comment https://www.bigmacktrucks.com/topic/1631-am-i-old-or-new/#findComment-7985 Share on other sites More sharing options...
HK Trucking Posted October 20, 2006 Share Posted October 20, 2006 From the previous post: 81 got small cab and old fuel tank etc... Actually it was the 66 to 72 models with the smaller cab.In 73 on up they moved the rear cab wall back a few inches, changed to the newer style dashboard & used the adjustable steering column.But this is irrelevant if they're just interested in the engine & driveline. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/1631-am-i-old-or-new/#findComment-7986 Share on other sites More sharing options...
Lmackattack Posted October 20, 2006 Share Posted October 20, 2006 2000 is a good price if the cab has little or no rust. the frame is good and the drive line is not beat to hell. Check the oil press at idle. look at the brakes to see if there adjusted. oil leaks. lots of those littel things will tell you if the truck was cared for.post some pics to give us a better idea of the condition shes inTrent Quote Link to comment https://www.bigmacktrucks.com/topic/1631-am-i-old-or-new/#findComment-7987 Share on other sites More sharing options...
ThaddeusW Posted October 20, 2006 Share Posted October 20, 2006 depend of the engine, tranny... 81 got small cab and old fuel tank etc... worth less then 86 and up. it also depend of the quality of the truck, if it's a truck that have been abused for years or a truck maintened for years! take a look at the frame, double frame with the time open and crack... but 2000$ if the truck is plated and inspected, it seems to be nice...I think in 86 they switched to galvanized sheet metal for the cab. The small cab went out in 73' but was regular sheet metal prone to rust when the paint chipped away. Quote -Thad What America needs is less bull and more Bulldog! Link to comment https://www.bigmacktrucks.com/topic/1631-am-i-old-or-new/#findComment-7988 Share on other sites More sharing options...
fullfuel01 Posted October 22, 2006 Share Posted October 22, 2006 changed the cab in 85-86.. the back of it gain a few inches. only changes dash from metal to vynil in 72-73, am I right? Quote Link to comment https://www.bigmacktrucks.com/topic/1631-am-i-old-or-new/#findComment-7997 Share on other sites More sharing options...
HK Trucking Posted October 22, 2006 Share Posted October 22, 2006 changed the cab in 85-86.. the back of it gain a few inches. only changes dash from metal to vynil in 72-73, am I right?Actually it was the 66 to 72 models with the smaller cab.In 73 on up they moved the rear cab wall back a few inches, changed to the newer style dashboard & used the adjustable steering column. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/1631-am-i-old-or-new/#findComment-7998 Share on other sites More sharing options...
fullfuel01 Posted October 23, 2006 Share Posted October 23, 2006 hummm not right HK, maybe they get the back longer 2 times... we hae 85 Mack with the small cab (behind look flat) and 86 with the new model Quote Link to comment https://www.bigmacktrucks.com/topic/1631-am-i-old-or-new/#findComment-8007 Share on other sites More sharing options...
HK Trucking Posted October 24, 2006 Share Posted October 24, 2006 hummm not right HK, maybe they get the back longer 2 times... we hae 85 Mack with the small cab (behind look flat) and 86 with the new modelWell then somebody must have stuck an old cab on your 85, cause the gospel truth is that the larger type cab with the back wall extended out was introduced in 73.Don't take my word for it, check with the Mack museum. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/1631-am-i-old-or-new/#findComment-8008 Share on other sites More sharing options...
Lmackattack Posted October 24, 2006 Share Posted October 24, 2006 Well then somebody must have stuck an old cab on your 85, cause the gospel truth is that the larger type cab with the back wall extended out was introduced in 73.Don't take my word for it, check with the Mack museum.Im with H.K on this one. 72-73 was the chang over yers from the flat wall (old style) to the new cab. I want to say 85 or around there they changed to galvanized steel to reduce rust issues. not shure if im correct but most old cabs I saw had a small handel to enter the cab ware the larger cabs had that long handel. anyone notice that or am I seeing things again.Trent Quote Link to comment https://www.bigmacktrucks.com/topic/1631-am-i-old-or-new/#findComment-8009 Share on other sites More sharing options...
HK Trucking Posted October 24, 2006 Share Posted October 24, 2006 not shure if im correct but most old cabs I saw had a small handel to enter the cab ware the larger cabs had that long handel.Yup, you're right Trent. Quote "If You Can't Shift It Smoothly, You Shouldn't Be Driving It" Link to comment https://www.bigmacktrucks.com/topic/1631-am-i-old-or-new/#findComment-8010 Share on other sites More sharing options...
Rob Posted October 24, 2006 Share Posted October 24, 2006 Yup, you're right Trent.My 72 has the short handle just like a B model.Rob 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/1631-am-i-old-or-new/#findComment-8015 Share on other sites More sharing options...
fullfuel01 Posted October 24, 2006 Share Posted October 24, 2006 I'm ready to put a 24 packs! yeap it's true they change the handle to grab in the truck in 72-73. but notice the back of the cab, one is flat and the other got a bigger curve at the bottom. in 72-73 they remove the old metal dash and green interior for the tan/beige one. nobody change the cab on my truck I'm sure of it...they extended the cab a few inches in 85-86 at the sime time of the dark blue/gray interior. Quote Link to comment https://www.bigmacktrucks.com/topic/1631-am-i-old-or-new/#findComment-8017 Share on other sites More sharing options...
David Posted October 25, 2006 Share Posted October 25, 2006 I have 9 R model cabs from 1978 to 1989. 3 with gray interior, 6 with brown. All 9 have long handles and the deeper cab. I've never seen a brown interior in a short cab. Quote Link to comment https://www.bigmacktrucks.com/topic/1631-am-i-old-or-new/#findComment-8024 Share on other sites More sharing options...
mackahaulic Posted October 29, 2006 Share Posted October 29, 2006 By any chance is the truck you talking about with the flat back a "U" model? Quote Link to comment https://www.bigmacktrucks.com/topic/1631-am-i-old-or-new/#findComment-8079 Share on other sites More sharing options...
fullfuel01 Posted October 29, 2006 Share Posted October 29, 2006 nop, DMM. also own a 74 Dm with the flat back. bought new in 74... Quote Link to comment https://www.bigmacktrucks.com/topic/1631-am-i-old-or-new/#findComment-8081 Share on other sites More sharing options...
mackahaulic Posted October 31, 2006 Share Posted October 31, 2006 I'm not sure if the DM's went to the hump back right away, but the U models had the flat back cab... Quote Link to comment https://www.bigmacktrucks.com/topic/1631-am-i-old-or-new/#findComment-8105 Share on other sites More sharing options...
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