Nasty sound when rolling in reverse

[DIESELGREEN]

Ok, already did the searching and was only able to come up with things like issues with the parking brake... So here's the question. Have a 70 deuce with multifuel, and suddenly is making a nasty grind/clunk sound, seems like from the tranny, when reversing or even rolling backwards in neutral. All forward gears are perfect, high or low range. Even does it rolling back with the t-case in neutral. I have a pretty steep incline in my driveway, and if rolling back slow enough it will actually STOP the truck on the hill. Any Ideas of where I should start?

 

[ODdave]

Check your pinion bearings

 

[one eye]

mine does that on occasion when goin backwards

 

[tigger]

Sprag!!!!!!!!!!!!!!!

 

[DIESELGREEN]

Hmm, I just greased the driveline and checked for play at all the yokes, all seems well. I only have this issue in reverse...

 

[one eye]

i was thinkin my parking brake got alittle grease on it and was binding up when the grease got dusty and dryed out. i will drive it til it breaks then i will know what it is

 

[doghead]

So, you did confirm all three parking brake springs are there, and the parking brake is adjusted and working properly?

 

[ODdave]

Sprag!!!!!!!!!!!!!!!

Forgot about them guys !

 

[one eye]

Mine dont do it all the time just once in a while

 

[DIESELGREEN]

So, you did confirm all three parking brake springs are there, and the parking brake is adjusted and working properly?

Yeah bud, all 3 are there and the drum is not loose. I even backed the cable tension all the way off to make sure nothing was binding up, still same issue. It really sounds like it might be coming from the transmission. Today it was worse than ever. I thought I was gonna shell it out just rolling back. BTW, loved the wig at the GA rally--

 

[DIESELGREEN]

Mine dont do it all the time just once in a while

Mine is intermittent also, but today was awful.

 

[ODdave]

sooo you do have a sprage case though?

 

[oldshep]

My truck is an air shift, no parking brake, and pinion bearings are new. When the truck is going backwards(only inreverse, with clutch engaged or disengaged) the trans makes what i would describe as a "nashing" of teeth sound. Its not as bad when the t case is in low range though. When you push in the clutch and are still rolling backwards the sound is terrible. Its never gotten worse though.

 

[DIESELGREEN]

sooo you do have a sprage case though?

No, it's got a Rockwell-Standard transfer case.

 

[ODdave]

No, it's got a Rockwell-Standard transfer case.

There both rockwells, Yours has the lever on the dash to engage the front axle right?

 

[DIESELGREEN]

There both rockwells, Yours has the lever on the dash to engage the front axle right?

Yes, the air-shift control switch is on the dash

 

[DIESELGREEN]

Yes, the air-shift control switch is on the dash

Is there a particular reason you ask what t-case I have? Is one more prone to the Issue I have been describing?

 

[ODdave]

Yes, If you had the sprauge style there might have been a chance it was broken. If you have the switch on the dash you dont have a sprauge to worry about. Eliminates one thing that could be causing it.

 

[DIESELGREEN]

Yes, If you had the sprauge style there might have been a chance it was broken. If you have the switch on the dash you dont have a sprauge to worry about. Eliminates one thing that could be causing it.

I went out to double check also,there is one cable return spring and a release spring for the parking brake shoes, I'm not sure where a third one would even go...I'm trying to eliminate the park brake, I'm pretty sure I have. I loosened the cable and looked at it, clears both sides of the drum ok seems like. I swear itt sounds like the trans, makes the same sound whether t-case is in neutral, hi/lo reverse, clutch engaged or disengaged.

 

[plym49]

Loose intermediate shaft bolts?