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#1
05-27-2019, 09:58 AM
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Gear pattern
What should I change?
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1969 LeMans..Liberty Blue 2001 WS6..Sunset Orange 1973 Pro Street Firebird..Lucerne Blue |
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#2
05-27-2019, 12:51 PM
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You might want to post a pic or two more of your drive side. But the one you did post looks good to me.
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 71' GTO -original 400/4-speed/3.23 posi 13.95 @ 102.1 on street tires @ 4055lbs. ‘63 LeMans- ‘69 400 w/ original transaxle. 2.69 gears. |
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#3
05-27-2019, 12:53 PM
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Looks inconsistent to me. Are you putting some resistance on the ring gear while turning the pinion? Some teeth look good, but some look a little deep on the pinion. Hard to tell. Also, what is the backlash at this point?
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'65 Tempest 467 3650# 11.30@120.31 |
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#4
05-27-2019, 01:39 PM
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Looks good from where I'm sitting (drive side) on the two teeth at the top of the pic. The others look like they weren't loaded hard enough during the test. We look closely at having a "comet" shape and "tail" uniform and coming to a point. It's also same distance from the outside edge of the tooth for the entire distance.
You may get it to spread out a tad more but it's centered toward the toe like it should be.......Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#5
05-27-2019, 01:51 PM
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Unfortunately I don't have any more pictures. I thought I had everything good but after putting rear back in the car I have a whine on deceleration at around 50-55. Backlash was at .008. I used a crush sleeve eliminator kit and had the pinion pre load at 20 inch #. Now I'm thinking the pre load may be to tight.All bearings are new and rear is a 7.5
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1969 LeMans..Liberty Blue 2001 WS6..Sunset Orange 1973 Pro Street Firebird..Lucerne Blue |
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#6
05-27-2019, 02:07 PM
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It's unlikely the whine is caused by the preload. It's coast pattern related more than likely.
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'65 Tempest 467 3650# 11.30@120.31 |
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#7
05-27-2019, 03:20 PM
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What brand gears
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2008KRE Q16 Winner 2014 atco raceway doorslammer winner 86 grand am tube car 8.95 @152 455 eheads solid flat tappet cam Hoffman Racing building and racing Pontiacs for 35 years |
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#8
05-27-2019, 07:23 PM
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Quote:
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1969 LeMans..Liberty Blue 2001 WS6..Sunset Orange 1973 Pro Street Firebird..Lucerne Blue |
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#9
05-28-2019, 12:30 PM
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Usually there quiet
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2008KRE Q16 Winner 2014 atco raceway doorslammer winner 86 grand am tube car 8.95 @152 455 eheads solid flat tappet cam Hoffman Racing building and racing Pontiacs for 35 years |
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#10
05-28-2019, 12:32 PM
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If car has polyurethane bushings in rear suspension you can get some noise from rear seen it many times
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2008KRE Q16 Winner 2014 atco raceway doorslammer winner 86 grand am tube car 8.95 @152 455 eheads solid flat tappet cam Hoffman Racing building and racing Pontiacs for 35 years |
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