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Growler Transimision


BobDeSoto

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I have a 1951 DeSoto - 25" block - fluid drive.

 

There is a noise from the rear - a growl or a loud buzz

More on deceleration - less on acceleration

Fluids are good.

Any thoughts?

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Noise from the rear?

While it's hard to diagnose from afar, the change in note acceleration vs deceleration indicates a ring & pinion issue.

The first thing to do is drop the driveshaft and check the pinion nut. If it's loose the pinion will shift back and forth causing the noise.

A pinion bearing can be the cause of the noise (or the result of a loose pinion nut) as well.

A wheel bearing does not change note on acceleration/deceleration, they just make a grinding noise that increases with speed.

The difference being the pitch of the noise (pinion) vs the loudness (wheel bearing).

Hope this helps.

Mopar rear ends have an excellent design (for their time) so you might find a good used one.

I would replace the center section (sometimes called a pumpkin) rather than the whole rear end.

Go to NAPA for the pinion seal as the later seals are much easier to replace and do it on the bench.

A nice afternoon job.

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I jacked up my rear end. Blocked front tires Put car in gear and ran the drive train. I got under there with an automotive stethoscope and prodded around. I was listening to outer wheel bearings, pinion bearing noise, etc. This tool can be effective.

 

 

Screen Shot 2020-06-09 at 11.29.04 AM.png

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That's Keith's grandson.

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Not quite. LOL.

I'll give you a hint. I got my drivers license at 16. At that time the average price for a gallon of gas was 0.87 US.

The top selling cars in the US that year, there was not 1 Mopar on the list!

 

Ford Escort $6,895
Ford Taurus $11,808
Honda Accord $10,925
Chevrolet Cavalier $7,395
Chevrolet Celebrity $11,010
Hyundai $5,395
Oldsombile Ciera $11,420
Nissan Sentra $6,449
Ford Tempo $9,056
Chevrolet Corsica / Berreta $9,955
Pontiac Grand AM $10,269
Toyota Camry $11,248
Chevrolet Caprice $12,510
Honda Civic $6,195
Ford Mustang $9,209

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