![]() |
Register or Log In To remove these advertisements. |
|
|
![]() |
|
Thread Tools | Display Modes |
![]() |
#1 |
Registered User
Join Date: Sep 2005
Location: Smith Mountain Lake Virginia
Posts: 1,537
|
Are these normal machining marks?????
Popped open the diff last night - lo and behold - the gears are NOT what the axle codes indicated (3.73)....
the ring reads "3817778 11:4 GM 10-71 2" .... Are the marks that look like teeth groves (to the right of the ring gear) normal? I wonder if it was prior damage that lead to the gears being changed....?? It's all nice and clean in there, no shavings, no rubbing, no binding, was very quiet when driven, no vibrations or anything noticable. Also, compared to what I thought were 3.73s - what's this going to do to my mileage, take off, top end, etc.... I am working on a 454 right now to put in.... eventually, go to posi when I locate one. Thanks for any input.
__________________
"A cat will almost always blink when hit between the eyes with a ball peen hammer" (you don't always have to state the obvious) Wear your PPE! You can eat with false teeth but you can't see with a false eye. 1959 Studebaker Silverhawk 350/400 1972 C10 L6 3OTT 2005 F350 - Built - whew! |
![]() |
![]() |
![]() |
#2 |
Registered User
Join Date: May 2005
Location: PA
Posts: 2,696
|
Re: Are these normal machining marks?????
That's far from normal. My guess is that the Pinion gear made those marks some time ago.
|
![]() |
![]() |
![]() |
#3 |
Registered User
Join Date: May 2005
Location: PA
Posts: 2,696
|
Re: Are these normal machining marks?????
Also, confirm all those numbers, I don't see anything that looks like a ring and pinion count number.
43:14 = 3.08 41:11 = 3.73 (and it looks like that's what you have, but hard to tell from the numbers I see in the pictures.)... |
![]() |
![]() |
![]() |
#4 |
Senior Member
![]() Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
|
Re: Are these normal machining marks?????
I agree, pinion got loose or pinion bearings went out at some point and chewed the carrier, shouldn't hurt anything, but the carrier may be weaker now because of metal loss. Should be ok until you get your posi. If you can't read the tooth count on the ring gear you can manually count them to get the ratio, I'm betting it is a 3.73 - 11 and 41.
__________________
1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 |
![]() |
![]() |
![]() |
#5 |
Registered User
Join Date: Sep 2005
Location: Smith Mountain Lake Virginia
Posts: 1,537
|
Re: Are these normal machining marks?????
I went back and looked - also did a little photo zooming - it appears that the numbers are actually "11 : 41" - the last "1" is very faint and only the top of it is stamped very deep - I have learned again - so it IS 3.73... THANKS A TON guys!
__________________
"A cat will almost always blink when hit between the eyes with a ball peen hammer" (you don't always have to state the obvious) Wear your PPE! You can eat with false teeth but you can't see with a false eye. 1959 Studebaker Silverhawk 350/400 1972 C10 L6 3OTT 2005 F350 - Built - whew! |
![]() |
![]() |
![]() |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|