BobDeSoto Posted June 9, 2020 Report Posted June 9, 2020 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? Quote
BobDeSoto Posted June 9, 2020 Author Report Posted June 9, 2020 Never thought of that - thanks. Quote
Loren Posted June 9, 2020 Report Posted June 9, 2020 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. Quote
BobDeSoto Posted June 9, 2020 Author Report Posted June 9, 2020 Thanks, Bearing noise would probably change with the brakes or turning left or right. Quote
keithb7 Posted June 9, 2020 Report Posted June 9, 2020 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. Quote
Sam Buchanan Posted June 9, 2020 Report Posted June 9, 2020 You have a great photographer.....I thought you were older than that........... ? 1 Quote
keithb7 Posted June 9, 2020 Report Posted June 9, 2020 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 Quote
MackTheFinger Posted June 9, 2020 Report Posted June 9, 2020 You're still a youngun Mr. B!! https://www.youtube.com/watch?v=BGrfhsxxmdE 1 Quote
BobDeSoto Posted June 9, 2020 Author Report Posted June 9, 2020 If you don't have a stethoscope you can use a length of heater hose and cup your hand over you ear. Quote
busycoupe Posted June 12, 2020 Report Posted June 12, 2020 Yup, you're way younger than I. The only car on that list that was around when I got a license is Ford Mustang. And yes, I'm sure that many on this forum are older than that! Quote
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