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Old 07-14-2017, 08:10 PM   #1
SannerRacing
 
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4L80 1/4 rear end gearing

Got the new trans installed now I'm concerned with my gearing. 3:89s with 28inch tires. Will I run out in 3rd before the finish line? There maybe more info than I'm giving to determine that so let me know. Thanks ahead of time. Oh red line/rev limiter hits at 7200.
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Old 07-14-2017, 09:46 PM   #2
jrhagen
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I'm no where near running out 3rd with 3.73 gears at 7000.
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Old 07-14-2017, 10:11 PM   #3
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Is 3rd 1:1 on that trans?

If so 3rd should top out ~154MPH.
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Old 07-15-2017, 09:19 AM   #4
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Quote:
Originally Posted by CamaroFred View Post
Is 3rd 1:1 on that trans?

If so 3rd should top out ~154MPH.
Yes and thanks looks like I'm good to go. This little mod got out of hand on the budget lol. Glad my gears are good.
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Old 07-15-2017, 12:24 PM   #5
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4L80 3.91 gears trapping at 137 in 3rd with a lot of gear to go.
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Best @ 586/525 =10.41 @ 133
AS OF 12/13/14>633 RWHP =10.22@135
AS OF 1/31/15 @ 633 RWHP=10.16@135
AS OF 1/29/16 @ 633 RWHP=10.10@136
TOPED 700 PASSES AFTER F.I. AND STILL ON THE ORIGIANAL STOCK AXLE & DIFF
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