The Ford Barn

josh1331 · 11-20-2016, 05:19 PM

Have Mitchell old in car, letting off on gas I get sort of whirling noise, traveling, I get a little of same. Does anyone experience same ?

koates · 11-20-2016, 05:59 PM

Hi there, The Mitchell overdrives tend to get rid of their oil a little out of the breather tube. It pays to keep a close check on the oil level fairly often. Regards, Kevin.

josh1331 · 11-20-2016, 07:47 PM

Thank you, overdrive comes with tube you install and you install overflow fuel filter I think on top to take care of expansion then it leaks back down upon cooling.

Dodge · 11-21-2016, 01:23 AM

The ones I have driven have been very quiet maybe its the rear end?

flatmotor40 · 11-21-2016, 05:51 AM

Mine is quiet and I put a line from the OD to the rearend top bolt for a vent.Tied both to filter up higher that unit

whizzernick · 11-21-2016, 09:09 AM

Sponsored Links (Register now to hide all advertisements)

gears are straight cut . so except some noise

Ol' Ron · 11-21-2016, 11:18 AM

Wet to Bville with JWL back in 02 5000 miles round trip and it never made a sound. I think it's a great unit.

jake197000 · 11-21-2016, 08:08 PM

sounds like rear end noise.

mrtexas · 11-21-2016, 10:01 PM

Quote:

Originally Posted by whizzernick

gears are straight cut . so except some noise

I don't think they are.

Planojc · 11-22-2016, 10:35 AM

gears are not straight cut as mrtexas said.

josh1331 · 11-22-2016, 11:38 AM

What I have found out so far is they will overtime quiet down as they wear in , this was from Mitchell. Checked everything ..all ok. It' takes pla CEO as you let up on gas pedal , very little sound and when below 40 mph it sings a very little not loud but you can hear it after 45 you can't hear. Others have said it does have a little whirl sound. Especially at low speed. John

jagnweiner · 11-22-2016, 12:37 PM

So other than the noise, how do you like it? What car are you using it in? Hoping someday to get one myself.

rotorwrench · 11-22-2016, 01:09 PM

A rear axle with too much play on the pinion to ring gear mesh can get pretty loud when you have it under load then quiet down completely when you let off the throttle. This is usually due to worn pinion tapered bearings that no longer have the correct pre-load. This allows the pinion to go off center under load. Makes for a loud groaning sound when this happens.

Yours is the opposite since it makes a sound when you let off. The planetary in an overdrive should run pretty quiet. Many of them freewheel when you let off. It might be the overrunning clutch that is making the sound if it has one. I'm not familiar with the innards of a Mitchell.

trevo · 11-22-2016, 01:29 PM

Interesting am finishing off fitting a Mitchell will post an opinion after a road test in a couple of weeks

Talkwrench · 11-22-2016, 06:42 PM

Let us know how you go Trevo.. How did you get yours in NZ ?

trevo · 11-23-2016, 12:57 AM

Talkwrench I got mine from Mitchell Manufacturing a year or so ago waited for winter to do the job ended up sidetracked with a brake upgrade on my Boss so have another couple of weeks before it's ready drive I don't work night and day anymore ha ha!

Talkwrench · 11-23-2016, 03:23 AM

So you just got it regular post?

Automotive Stud · 11-23-2016, 09:32 AM

Mine is quiet. I run 80w140 gear oil in it though.

trevo · 11-23-2016, 01:05 PM

Talkwrench no it was picked up from there plant by Mainfreight and shipped down here. I preferred to organise my own freighting took a few weeks to get to NZ

josh1331 · 11-23-2016, 11:25 PM

The OD is on my 1941 coupe, had it put on by pro who never did one of these before so was anxious to do one. According to info given, the lever on the OD should face straight down or up however you decide you want to assemble, up or turn unit around and it will face straight down. I noticed mine faces at slight angle from straight down when OD IS ENGAGED. I SAW THIS WHEN I LOOKED UNDER CAR IN GARAGE TODAY. BUT THINKING ABOUT IT ACCORDING TO INSTRUCTIONS, YOUR SUPPOSE TO PUT OD IN NEUTRAL THEN ADJUST LINKAGE SO IT FACES DOWN.?.? I'm not too swift on this set up, I'm a DIY guy learning about flatheads and OD'S any help appreciated. John

11-20-2016, 05:19 PM	#1
josh1331 Senior Member Join Date: May 2010 Location: Charlestown,R.I. Posts: 465	Mitchell Overdrive - noise to expect Have Mitchell old in car, letting off on gas I get sort of whirling noise, traveling, I get a little of same. Does anyone experience same ?

11-20-2016, 05:59 PM	#2
koates Senior Member Join Date: May 2010 Location: Melbourne Australia. Posts: 2,079	Re: Mitchell Overdrive - noise to expect Hi there, The Mitchell overdrives tend to get rid of their oil a little out of the breather tube. It pays to keep a close check on the oil level fairly often. Regards, Kevin.

11-20-2016, 07:47 PM	#3
josh1331 Senior Member Join Date: May 2010 Location: Charlestown,R.I. Posts: 465	Re: Mitchell Overdrive - noise to expect Thank you, overdrive comes with tube you install and you install overflow fuel filter I think on top to take care of expansion then it leaks back down upon cooling.

11-21-2016, 01:23 AM	#4
Dodge Senior Member Join Date: Nov 2011 Location: Sonoma, CA. Posts: 1,497	Re: Mitchell Overdrive - noise to expect The ones I have driven have been very quiet maybe its the rear end?

11-21-2016, 05:51 AM	#5
flatmotor40 Senior Member Join Date: May 2010 Location: Georgia Posts: 611	Re: Mitchell Overdrive - noise to expect Mine is quiet and I put a line from the OD to the rearend top bolt for a vent.Tied both to filter up higher that unit

11-21-2016, 09:09 AM	#6
whizzernick Senior Member Join Date: Jul 2013 Location: Hayward Ca Posts: 635	Re: Mitchell Overdrive - noise to expect Sponsored Links (Register now to hide all advertisements) gears are straight cut . so except some noise

11-21-2016, 11:18 AM	#7
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: Mitchell Overdrive - noise to expect Wet to Bville with JWL back in 02 5000 miles round trip and it never made a sound. I think it's a great unit.

11-21-2016, 08:08 PM	#8
jake197000 Senior Member Join Date: Sep 2010 Posts: 350	Re: Mitchell Overdrive - noise to expect sounds like rear end noise.

11-22-2016, 10:35 AM	#10
Planojc Senior Member Join Date: May 2010 Location: Plano, Texas Posts: 844	Re: Mitchell Overdrive - noise to expect gears are not straight cut as mrtexas said.

11-22-2016, 11:38 AM	#11
josh1331 Senior Member Join Date: May 2010 Location: Charlestown,R.I. Posts: 465	Re: Mitchell Overdrive - noise to expect What I have found out so far is they will overtime quiet down as they wear in , this was from Mitchell. Checked everything ..all ok. It' takes pla CEO as you let up on gas pedal , very little sound and when below 40 mph it sings a very little not loud but you can hear it after 45 you can't hear. Others have said it does have a little whirl sound. Especially at low speed. John

11-22-2016, 12:37 PM	#12
jagnweiner Senior Member Join Date: Sep 2016 Location: Geneseo, IL Posts: 290	Re: Mitchell Overdrive - noise to expect So other than the noise, how do you like it? What car are you using it in? Hoping someday to get one myself. __________________ Regards, Scott '47 Mercury Convertible '25 Dodge Bros. Touring Car '63 MG Midget

11-22-2016, 01:09 PM	#13
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,431	Re: Mitchell Overdrive - noise to expect A rear axle with too much play on the pinion to ring gear mesh can get pretty loud when you have it under load then quiet down completely when you let off the throttle. This is usually due to worn pinion tapered bearings that no longer have the correct pre-load. This allows the pinion to go off center under load. Makes for a loud groaning sound when this happens. Yours is the opposite since it makes a sound when you let off. The planetary in an overdrive should run pretty quiet. Many of them freewheel when you let off. It might be the overrunning clutch that is making the sound if it has one. I'm not familiar with the innards of a Mitchell.

11-22-2016, 01:29 PM	#14
trevo Senior Member Join Date: Dec 2011 Location: Napier NZ Posts: 299	Re: Mitchell Overdrive - noise to expect Interesting am finishing off fitting a Mitchell will post an opinion after a road test in a couple of weeks

11-22-2016, 06:42 PM	#15
Talkwrench Senior Member Join Date: Aug 2012 Location: Perth, Western Australia Posts: 2,687	Re: Mitchell Overdrive - noise to expect Let us know how you go Trevo.. How did you get yours in NZ ? __________________ *"Came too close to dying to stop living now!"*

11-23-2016, 12:57 AM	#16
trevo Senior Member Join Date: Dec 2011 Location: Napier NZ Posts: 299	Re: Mitchell Overdrive - noise to expect Talkwrench I got mine from Mitchell Manufacturing a year or so ago waited for winter to do the job ended up sidetracked with a brake upgrade on my Boss so have another couple of weeks before it's ready drive I don't work night and day anymore ha ha!

11-23-2016, 03:23 AM	#17
Talkwrench Senior Member Join Date: Aug 2012 Location: Perth, Western Australia Posts: 2,687	Re: Mitchell Overdrive - noise to expect So you just got it regular post? __________________ *"Came too close to dying to stop living now!"*

11-23-2016, 09:32 AM	#18
Automotive Stud Senior Member Join Date: May 2010 Location: New Jersey Posts: 832	Re: Mitchell Overdrive - noise to expect Mine is quiet. I run 80w140 gear oil in it though.

11-23-2016, 01:05 PM	#19
trevo Senior Member Join Date: Dec 2011 Location: Napier NZ Posts: 299	Re: Mitchell Overdrive - noise to expect Talkwrench no it was picked up from there plant by Mainfreight and shipped down here. I preferred to organise my own freighting took a few weeks to get to NZ

11-23-2016, 11:25 PM	#20
josh1331 Senior Member Join Date: May 2010 Location: Charlestown,R.I. Posts: 465	Re: Mitchell Overdrive - noise to expect The OD is on my 1941 coupe, had it put on by pro who never did one of these before so was anxious to do one. According to info given, the lever on the OD should face straight down or up however you decide you want to assemble, up or turn unit around and it will face straight down. I noticed mine faces at slight angle from straight down when OD IS ENGAGED. I SAW THIS WHEN I LOOKED UNDER CAR IN GARAGE TODAY. BUT THINKING ABOUT IT ACCORDING TO INSTRUCTIONS, YOUR SUPPOSE TO PUT OD IN NEUTRAL THEN ADJUST LINKAGE SO IT FACES DOWN.?.? I'm not too swift on this set up, I'm a DIY guy learning about flatheads and OD'S any help appreciated. John