adm22
Well-known member
- Joined
- Oct 26, 2012
- Messages
- 195
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- My Car
- 1972 convertible with almost half a million miles 351c- T5 transmission for 24 MPG on the Hwy! Still has a few original parts on it- not many!
also have a 1975 Bricklin with less than 20k miles.
The rear end center section / hogs head / differential / third member (I have heard it called all these things) in my car has been leaking for sometime and has also over the years gotten "Loose" so that when the car is in the air the drive shaft turns about 1/3 of the way before it will engage. Other than having to add fluid every so often I have not noticed any problems. The mechanic who does work for me that is beyond my skill level / easy to do with tools I own, recently convinced me it was time to replace or rebuild although could not find anyone who wanted to rebuild one- so repalce was the option.
I have a 2.75 9 inch 28 spline gears. According to who one talks to I have been told these are the best ones to have, the worst ones to have or else "granny gears". I rather like since they get me reasonably good gas mileage.
Found a junk yrad about 60 miles from my house in the oppiste direction form the palce the work was being done. They had "lots" of hogs heads and I could have my pick for $75, a price that sounded reasonable. The second one I tried was both a 28 spline and a 2.75 gear ratio. It was rather dirty as it had been sitting around for an unknown period of time and the old gear lube had attracted dirt. It felt tighter than mine so I bought it.
Got it to the grage and discovered after it all got cleaned up that there were several chips in the big gear on the flat sopts ot the top of the teeth- and that looks bad. So went back to junk yard and was told these do not matter it is the flat surfae of the gear that makes contact and these appeared for the most part to be OK. Was told good check the other ones and exchaneg if I wanted. After going through them all I could not find another that was the right gear ratio and right spline count. So I took advise of junk yard guy and decied to have the one I had bought the previous day put in. Was told if it was bad could exchange for another one BUT would have to pay the guys to look at full rear ends both on and off car to find it this could cost a lot of $$$.
So took it back nad reluctantly was told they would try putting in until they found a really big size chip in the smaller worm gear. This was really bad.
So they decided to put in a new seal so the grease would not leak out in the front and at the same time removed the thin "gasket" like thing and replaced it with silicon in order to tighten it up a bit.
It has indeed gotten tighter and I do not notice the clunk that I used to get when changing from forwrds to reverse and vice versa so this is a good thing. There is however a whine coming from the rear end when I decelerate. None during acceleration or when maintaining a constant speed. This I have been told is since the gears are now tighter.
This is not a good thing but wondering how bad of a thing it is. At this point I have driven it maybe 70 miles and it has not gotten any worse and perhaps lesseneed a wee bit- or I could just be getting used to it. Is this noise something that will disappear after awhile once the gears get used to meshing in their new positions or is this something that will wind up tearing things up and wrecking the gears that are when it was taken apart in good shape, especailly when compared to the one I just got?
The guy who did the work know it is not a good thing but is not entirely convinced it is a bad thing, especailly sicne it only makes the whine when it is decelerating.
I have a 2.75 9 inch 28 spline gears. According to who one talks to I have been told these are the best ones to have, the worst ones to have or else "granny gears". I rather like since they get me reasonably good gas mileage.
Found a junk yrad about 60 miles from my house in the oppiste direction form the palce the work was being done. They had "lots" of hogs heads and I could have my pick for $75, a price that sounded reasonable. The second one I tried was both a 28 spline and a 2.75 gear ratio. It was rather dirty as it had been sitting around for an unknown period of time and the old gear lube had attracted dirt. It felt tighter than mine so I bought it.
Got it to the grage and discovered after it all got cleaned up that there were several chips in the big gear on the flat sopts ot the top of the teeth- and that looks bad. So went back to junk yard and was told these do not matter it is the flat surfae of the gear that makes contact and these appeared for the most part to be OK. Was told good check the other ones and exchaneg if I wanted. After going through them all I could not find another that was the right gear ratio and right spline count. So I took advise of junk yard guy and decied to have the one I had bought the previous day put in. Was told if it was bad could exchange for another one BUT would have to pay the guys to look at full rear ends both on and off car to find it this could cost a lot of $$$.
So took it back nad reluctantly was told they would try putting in until they found a really big size chip in the smaller worm gear. This was really bad.
So they decided to put in a new seal so the grease would not leak out in the front and at the same time removed the thin "gasket" like thing and replaced it with silicon in order to tighten it up a bit.
It has indeed gotten tighter and I do not notice the clunk that I used to get when changing from forwrds to reverse and vice versa so this is a good thing. There is however a whine coming from the rear end when I decelerate. None during acceleration or when maintaining a constant speed. This I have been told is since the gears are now tighter.
This is not a good thing but wondering how bad of a thing it is. At this point I have driven it maybe 70 miles and it has not gotten any worse and perhaps lesseneed a wee bit- or I could just be getting used to it. Is this noise something that will disappear after awhile once the gears get used to meshing in their new positions or is this something that will wind up tearing things up and wrecking the gears that are when it was taken apart in good shape, especailly when compared to the one I just got?
The guy who did the work know it is not a good thing but is not entirely convinced it is a bad thing, especailly sicne it only makes the whine when it is decelerating.
