No lube = T56 MELTDOWN! Pics...
06-21-2006, 07:50 AM
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No lube = T56 MELTDOWN! Pics... To make a long story short, long stock truck driveshaft deflected at high speeds on the dyno and a couple of high speed runs on the interstate. It wabbled the rear bushing out which pushed the seal out. End result lost all fluid and didn't know it and about 20 miles later in 6th gear running 80mph and this happend.
No lubrication = melted gears and a hell of a lot of money.
Notice how blue 3rd gear is and the end of the mainshaft just from being so close to the heat.
No lubrication = melted gears and a hell of a lot of money.
Notice how blue 3rd gear is and the end of the mainshaft just from being so close to the heat.
06-21-2006, 10:14 AM
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I've broken plenty of gears before but Thought you guys would be interested in these pics. I've never seen any get hot enough to roll the teath over and then smear them like butter 
06-21-2006, 10:41 AM
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that hapened to my dad in his Daily driver 95 gmc 1500. it rolled the teeth over smooth though our input shaft was not as melted as yours, it also destroyed the bearings and races, since it used non tapered plastic cage bearing most of the rollers where ground into particles, and ruint the 3rd and 4th gear synchros. that truck used a new venture or new process or something like that tranny and it was the hardest transmission to put together I have ever worked on. I guess you might well do new synchros and steel shift forks while you've got it apart.
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06-21-2006, 11:02 AM
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Not sure of the driveshaft length yet. It was a factory steel one that I had shortened 2-3/4" for the T56 to fit. Getting a used HD aluminum aftermarket Inland shaft for an ext. cab that I will have shortened.
I have a 95 truck 5 speed that I have had apart twice. you are right it is a bitch to assemble.
I have a 95 truck 5 speed that I have had apart twice. you are right it is a bitch to assemble.
06-21-2006, 11:27 AM
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You may want to measure your driveshaft and compare to the chart here:
http://www.markwilliams.com/driveshafttech.aspx
You may have exeeded the critical RPM of the driveshaft and caused it to bow.
This is what happened to my friend Jeff at Road America when his driveshaft bowed and let go.
Andrew
http://www.markwilliams.com/driveshafttech.aspx
You may have exeeded the critical RPM of the driveshaft and caused it to bow.
This is what happened to my friend Jeff at Road America when his driveshaft bowed and let go.
Andrew
06-21-2006, 01:06 PM
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Originally Posted by Project GatTagO
You may want to measure your driveshaft and compare to the chart here:
http://www.markwilliams.com/driveshafttech.aspx
You may have exeeded the critical RPM of the driveshaft and caused it to bow.
This is what happened to my friend Jeff at Road America when his driveshaft bowed and let go.
Andrew
http://www.markwilliams.com/driveshafttech.aspx
You may have exeeded the critical RPM of the driveshaft and caused it to bow.
This is what happened to my friend Jeff at Road America when his driveshaft bowed and let go.
Andrew
06-21-2006, 01:14 PM
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Sorry to hear that, bad *** to see a silverado with a 6speed! Seems like everyone is going turbo these days.
Going to find a rebuilt one or have this one completely rebuilt? Again, that blows.
Going to find a rebuilt one or have this one completely rebuilt? Again, that blows.
06-21-2006, 01:17 PM
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Originally Posted by WestSide
Sorry to hear that, bad *** to see a silverado with a 6speed! Seems like everyone is going turbo these days.
Going to find a rebuilt one or have this one completely rebuilt? Again, that blows.
Going to find a rebuilt one or have this one completely rebuilt? Again, that blows.
06-21-2006, 04:07 PM
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That looks awesome. Sorry for the bad news, but thanks for the awesome pics. Gears meshing and spinning that fast do create a good amount of friction/heat without lubrication.
06-21-2006, 08:47 PM
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Originally Posted by mjhoward
Thanks. Hopefully find a good used one and put my good shifting componenets in it. Thinking about a brand new Viper unit though.
Andrew
06-21-2006, 09:01 PM
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57-7/8" approx from centerline for ujoint to centerline. A Mark Williams mild steel 3.5" shaft is rated @ 5792rpm. So I guess the equivalent stock material shaft wouldn't like 6500
I may give liberty a call tomorrow. They fixed some gears off my old M22 muncie clutchless tranny several years ago. I'm sure they want more than i'm willing to spend right now. I can get a really nice LS1 tranny built or do it myself for the $1400-1700 range, Mikronite gears as well.
I may give liberty a call tomorrow. They fixed some gears off my old M22 muncie clutchless tranny several years ago. I'm sure they want more than i'm willing to spend right now. I can get a really nice LS1 tranny built or do it myself for the $1400-1700 range, Mikronite gears as well.