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reckerrp98

New Member

• Mar 1, 2015

• #1

Yes, yes, yes, I have searched hi and low for a diagnosis---or even similar symptoms for my LT77 "issue"! Please help fellas!

- Upon shifting to 3rd gear last week, I heard a "funny" noise

- As I began to slow/coast into my parking spot, a loud CLICK/KNOCK was heard from my gearbox area...

- When I left work, the gearbox was now WHINING and the CLICK/KNOCK persists ONLY when in gear, and when coasting/overrun.

I installed a new front propshaft yesterday---no change. Under power---no clicking.....whilst coasting: clicking. It's loud---every gear and speed combination and it's synced to the speed of the propshafts.

Any ideas? I'm leaning towards worn output shaft splines....but why would i still hear the whine? And why the knocking only when coasting in gear? THANK YOU!

 

jamesmartin

Well-Known Member

• Mar 1, 2015

• #2

the gears in t/box and gear box have helical teeth , when you apply power gears want to push to one end of box (which if bearings are good and set correctly they cant move ) when you lift off and coast power is reversed so gears have a push to the other end of box( if theres play in bearings they will move ,a chipped tooth can also present in the same way noise wise , main shaft and input shaft wear doesnt produce any whine just a clunk when changing gear or lifting off quick, check condition of oil in both boxes, check front diff flange for play or try with front prop off in diff lock, you can remove t/box sump plate and check for any endfloat in gears ,without more info its hard to narrow it down

 

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reckerrp98

New Member

• Mar 1, 2015

• #3

Makes sense---any ideas on where to start for bearing play? Hopefully keeping the gearbox in situ.....

 

jamesmartin

Well-Known Member

• Mar 1, 2015

• #4

front diff , check oils for contamination

 

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reckerrp98

New Member

• Mar 7, 2015

• #5

Renewed transfer case and gearbox oil---no change....

BUT--took it up to speed and guess what....no noise/whine/clunk in 4th gear! That helps me isolate a ton! Looking at layshaft gear/bearing??

 

jamesmartin

Well-Known Member

• Mar 7, 2015

• #6

yes as theres no torque running through lay shaft when in 4th, was there not any sign of metal in the oil ie filings or a sheen

 

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reckerrp98

New Member

• Mar 7, 2015

• #7

Transfer case oil was a bit emulsified---but nothing beyond the norm on the chip plug

 

jamesmartin

Well-Known Member

• Mar 7, 2015

• #8

gear box i meant

 

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reckerrp98

New Member

• Mar 8, 2015

• #9

gearbox was clean too