Transmission noise - Video

[grdprx]

I have a noise on my 727 that started late this past summer.  Sounds like its building pressure, sort of a high pitched sound.  I tried taking a video and you and kind of hear it... 

I have a 68 Charger, 440 mildly built.  Nothing done to the transmission, except that I replaced the rear band.  I used the Mopar 727 transmission handbook to do that job.  Was proud of myself that the tranny drives at all!

I'm about to drop the transmission this weekend to exchange the input shaft.  I just happened to find a 1965 727 on Craigslist with the 19 spline input shaft.... And the torque converter I ordered from Dynamic certainly doesn't fit.       So, I got a donor tranny to swap input shafts.  Winter project! 

Figured I'd check with the engine/tranny gurus about this noise.



http://youtu.be/0oak3ALea9E

[chargd72]

Are you sure it's not the rear end?  Pinion could just be a little off so it hums while under load.

[grdprx]

I am sure, it definitely comes from right under the trans hump.

[John_Kunkel]

A whining noise in 1st gear that goes away in 2nd is probably gear noise from the planetaries...not uncommon, especially with no insulation on the floor.

I'm perplexed by your planned input shaft change, you're going to put a 19-spline input in your '68 trans?

[grdprx]

I picked up the trans off CL, was told it was from a 68 Newport.   I've run it for a couple years, it's got no "power.". So I ordered a new converter from Dynamic, I think it's like a 2800 stall. Went to slide it on last spring, wouldn't go. That is when I discovered it was a 19 spline trans from the Newport. So, I am going to swap in a 24 spline now so I can use this pretty dynamic converter I bought.

Regarding the noise, I don't recall this last year or the beginning of this past spring or the year before. You dont think it's abnormal?

[John_Kunkel]

My hearing isn't great and the sound on the video isn't the best but it doesn't sound abnormal to me.

If the trans is actually a '66 (only year of lever-shift and 19-spline input), the angle of helix on the planetary gears makes for noisier operation than the '67 and later...in '67 they changed the angle of helix to quiet the gears down. In the pic below the '67 and later is on the right.

[grdprx]

Thanks very much John. I'll hope it's all in my head. =)

I tried making the video a couple times, my next thought was to just set the phone on the trans tunnel, but then you'd be looking up my nose!

I'm thinking I may do a pictorial on the input shaft swap.   I've only seen the write up on Mopar Muscle mag's site.

[moparstuart]

yup sounds like a normal 727 whiring noise i have always heard in them