#21  
Old 11-11-2024, 03:36 PM
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geeteeohguy geeteeohguy is offline
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Waiting for Ol' Pinionhead to give the final say on these. Yeah or nay?

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  #22  
Old 11-11-2024, 09:03 PM
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71 Goatman 71 Goatman is offline
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Installed one set of used gears in a 68 Firebird for a friend. Horrible gear whine after all that work. Learned my lesson. But once, cry once…..Spend the money get a new set of gears and don’t look back. Certain parts are just fine used, for me a ring and pinion is not one of them.

Just installed a fresh set of 3.73’s in my 71 GTO, went in well and no gear whine whatsoever, Richmond gears.

Just my .02

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Hot Rods & Horsepower.......A diease for which there is no cure.

71 GTO, 463, SD 295 d-port heads, 10.75:1, RPM intake, 502hp/560tq @ the crank, 200r4, 10" Continental convertor, Bullet 234/244 cam, Cliff's Q-Jet, 3:42's w/Eaton True Trac, 5 Power Tours. New performance numbers coming
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Old 11-12-2024, 04:07 PM
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SD421 SD421 is offline
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Could it be residue from the parts being on a shelf inside a bldg in the dirty desert air?
I got these from Frank’s Pontiac Parts. Located in Twenty Nine Palms

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1966 GTO

1966 421-9.3-1 comp-Race Tec 23cc Pistons
1966 Tri-Power
1967 670 Heads
Pontiac "Highlift" TriPower Cam by SpeedPro
DUR 214 Int 224 Exh @.050 - 107 ICL
LIFT .445" Int .465" Exh
Tri-Y-Headers by Tribal Tubes w/ Goerlich Mufflers
1966 Muncie Wide Ratio 4-Speed
1968-72 Chevy 12 Bolt Rear End w/ 3.73 rear gears
  #24  
Old 11-13-2024, 09:08 AM
PontiacHO PontiacHO is offline
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Agree with others concerning rough gear surface. If that’s a Chevy style 12 bolt .030 to .035 pinion shim is where I’d start. Backlash at .008. You’ll probably only achieve a decent pattern on one side with used gears.

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Old 11-13-2024, 09:40 AM
Formulas Formulas is offline
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OMG clean it up see what you have, spray it with WD40 wipe tooth faces aggressively with a rag / tooth brush to remove loose particles then spray it all down with carb cleaner

No amount of pictures on the internet with people guessing on condition error'ing on the side of caution are going to be able to tell what you will be able to see with your own eyes once cleaned

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