Low whining sound from undercarriage

[Paul Workman]

The 90s have straight cut gears in the ZF which produces some gear whine, especially in 1st and 2nd, I find (in my 90 as well). AND, it comes when the clutch is out and goes away when the clutch pedal is engaged. But, if you noise is the opposite, then throw out bearing comes to mind - except seems unlikely with so few miles.

There are many members in your area that might be able to drop by your location and assess the sound with a learned ear. Aside from that, have you changed the transmission fluid yet? Changing the trans and differential fluid - may or may not improve the sound (if coming from the trans), but then you can check that off the list and you'll know that isn't the issue.

Perhaps Mark Horner or one of several other local Texicans can give it a listen. And, given that gear whine is the nature of the beast in the 90 to mid 92s, if that is all it is, the fix is turning up the radio or installing headers w/o cats! (kidding ya!)

[Hib Halverson]

Originally Posted by Paul Workman

The 90s have straight cut gears in the ZF which produces some gear whine, especially in 1st and 2nd, I find (in my 90 as well).

(snip)


There are no "straight cut" gears in any version of the ZF S6-40.

Gears in the early 6-40s have a slightly smaller helix angle and that's why the early transmissions are a little more noisy and have a little higher input torque rating.

[Paul Workman]

Originally Posted by Hib Halverson

(snip)


There are no "straight cut" gears in any version of the ZF S6-40.

Gears in the early 6-40s have a slightly smaller helix angle and that's why the early transmissions are a little more noisy and have a little higher input torque rating.

A picayune distinction, to be sure, Hib.

[Hib Halverson]

Originally Posted by Paul Workman

A picayune distinction, to be sure, Hib.

Granted, you've got me beat on the vocabulary front. I had to look up the meaning of "picayune".

Nevertheless, Paul, if you knew a bit more about manual transmissions you'd not say that.

I'd like to suggest that when you're making statements about subjects on which you lack accurate information, maybe you should think twice about commenting.

[Paul Workman]

Originally Posted by Hib Halverson

Granted, you've got me beat on the vocabulary front. I had to look up the meaning of "picayune".

Nevertheless, Paul, if you knew a bit more about manual transmissions you'd not say that.

I'd like to suggest that when you're making statements about subjects on which you lack accurate information, maybe you should think twice about commenting.

Oh... THIS certainly went off the rails! It isn't going the way I intended! I meant no disrespect, Hib. OK, I'll admit in jest I was just "pokin' the bear" a little, but thought you'd "get that" - that I was really giving you a sort of a "left-handed" compliment.

(edit): Everyone...should think twice before saying stupid, derogatory, and unfounded chit on an open forum. Especially the two of us.

Sorry for the misunderstanding, Hib. (Shoulda taken my meds first.)

[Hib Halverson]

Originally Posted by Paul Workman

Oh... THIS certainly went off the rails! It isn't going the way I intended! I meant no disrespect, Hib. OK, I'll admit in jest I was just "pokin' the bear" a little, but thought you'd "get that" - that I was really giving you a sort of a "left-handed" compliment.

(edit): Everyone...should think twice before saying stupid, derogatory, and unfounded chit on an open forum. Especially the two of us.

Sorry for the misunderstanding, Hib. (Shoulda taken my meds first.)

Ok. I did misunderstand the context. Sometimes, that happens when we can't see or hear each other, but I'm still smarting from having to go to my dictionary to look up "picayune".

[Dynomite]

Originally Posted by Hib Halverson

(snip)

There are no "straight cut" gears in any version of the ZF S6-40.

Gears in the early 6-40s have a slightly smaller helix angle and that's why the early transmissions are a little more noisy and have a little higher input torque rating.

I find that information very interesting....thanks Hib