rear end and diff suggestions - F-Body Road Racing and Autocross Forums

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ReEntryRacer View Member Profile	Sep 16 2010, 05:42 AM Post #2
ReEntryRacer Group: Advanced Members Posts: 618 Joined: 8-December 04 From: British Columbia, Canada Member No.: 569	QUOTE (wastntim @ Sep 13 2010, 09:18 PM) considering going to a 10 bolt and a 3.90. I have been running that combo for two years, with an Auburn Racers Diff. I use a late 4th gen rear, with LS1 4th gen rear brakes, which are adequate. I have only found 3.90s from Motive Gear (made in Italy). All is fine so far!

Sidney View Member Profile	Sep 17 2010, 05:36 PM Post #3
Member Group: Advanced Members Posts: 181 Joined: 13-January 04 From: Bloomington, IL Member No.: 122	QUOTE (ReEntryRacer @ Sep 16 2010, 12:42 AM) QUOTE (wastntim @ Sep 13 2010, 09:18 PM) considering going to a 10 bolt and a 3.90. I have been running that combo for two years, with an Auburn Racers Diff. I use a late 4th gen rear, with LS1 4th gen rear brakes, which are adequate. I have only found 3.90s from Motive Gear (made in Italy). All is fine so far! Rob, You can't run the 4th gen rear in a 3rd gen in CMC. These are about 3 inches wider so be careful when picking one up used if it's already out of a car. Sidney

Posts in this topic

wastntim rear end and diff suggestions Sep 14 2010, 04:18 AM

ReEntryRacer QUOTE (wastntim @ Sep 13 2010, 09:18 PM) ... Sep 16 2010, 05:42 AM

Sidney QUOTE (ReEntryRacer @ Sep 16 2010, 12:42 ... Sep 17 2010, 05:36 PM

nape QUOTE (Sidney @ Sep 17 2010, 12:36 PM) Ro... Sep 22 2010, 01:50 AM

trackbird QUOTE 7.29.2 Both GM and Ford cars may also use a ... Sep 22 2010, 03:37 PM

nape 7.29.1 should allow the update/backdate across the... Sep 22 2010, 06:24 PM

CMC #37 I know it is allowed to have 4th gen rears now in ... Sep 22 2010, 06:47 PM

GlennCMC70 It is a legal swap. The question was asked about ... Sep 22 2010, 11:24 PM

StanIROCZ I'd do a 4th gen rear and avoid the wheel spac... Sep 23 2010, 04:21 AM

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wastntim View Member Profile	Sep 14 2010, 04:18 AM Post #1
newbie Group: Members Posts: 24 Joined: 13-September 10 Member No.: 20,845	Hey all, new here. I'm looking for any and all helpful suggestions. Over the weekend, I broke my pinion on my borg warner in my 89 firebird LT1 running CMC2. I had been running a 3.45 gear but was considering going to a 10 bolt and a 3.90. Any suggestions regarding the rear end and differential is appreciated.