anyone know or have a similar experience with a rather solid clunk in either rear end or transmission when put into reverse on a 72 727 torque flight. forward engagement is normal but i get a loud clunk when put in reverse. someone must know?
reverse clunk?
- Thread starter ltrripp11
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68383GTS
Well-Known Member
My brothers T/A Challenger did the same thing we changed out the third memeber and it was good to go.I would pull the drivshaft put it in reverse and if there is not clunk I would say its the third member.This is how we figured it out anyway... Jim
440superduster
Well-Known Member
its a normal thing its the slack in the slip yoke bening taken up
68383GTS
Well-Known Member
Does it just cluck once when you put it in gear?Or does it keep clunking as you back up?If it keeps clunking as you back up it may be the third memeber.If it is just one clunk when you put it in reverse you may need to replace the U-joints in the driveshaft... Jim
Another vote for u-joints.
70Duster440
Well-Known Member
U-joints and/or excessive backlash in the third member.
daredevil
Well-Known Member
have you had a u joint failure or done big burnouts in 1st? if so it could be a sprag about to go.
goldduster360
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If the 727 has a low/reverse band like the 904, the clunk is more than likely from the band/drum becoming glazed from hard use or from putting it in reverse cold with the engine at high idle for several seasons.
It is standard operating procedure for most overhaul shops to sand the drum down before putting on a new band. This breaks the glaze and allows a little extra oil to remain on the drum and cushion the band preventing the dreaded reverse clunk.
A lower idle setting can help soften the clunk too and prevent band glazing.
Since the low reverse band is only actuated during manual low or reverse I always avoid using it until engine is warm or at normal idle speed. My car still has a functioning choke with fast idle until warm up so I always back my car into it's parking slot to avoid using reverse when cold/high idle.
The reverse clunk is annoying but it won't hurt anything, your car is still healthy.
It is standard operating procedure for most overhaul shops to sand the drum down before putting on a new band. This breaks the glaze and allows a little extra oil to remain on the drum and cushion the band preventing the dreaded reverse clunk.
A lower idle setting can help soften the clunk too and prevent band glazing.
Since the low reverse band is only actuated during manual low or reverse I always avoid using it until engine is warm or at normal idle speed. My car still has a functioning choke with fast idle until warm up so I always back my car into it's parking slot to avoid using reverse when cold/high idle.
The reverse clunk is annoying but it won't hurt anything, your car is still healthy.
70Swinger510
Bay Area Swinger
:cheers:
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