Challenger - Diff upgrade - Moparchat

DavidA · #1 07-26-2005, 03:58 PM

Currently have a stock '489' casing 3.23, openend diff in my Challenger. Have been quoted $750 for 'Posi' replacement (Installed). Includes an Auburn unit. Haven't decided on whether to go with 3.55 or 3.91 gears.

I know very little about all this. Does the price sound reasonable ? Anything I should be wary of ?

Also will be driving a little bit of the highway. Is 3.91 gears too extreme ? Running a fresh 383 in the car, with a 2800 TCI stall converter.

pishta · #2 07-26-2005, 05:40 PM

Figure your highway RPM's and dont let them go below 2800 or youll be slipping the whole way. I have about a 27 tall tire and 3.91's and Im at 3500 at 65MPH

ehostler · #3 07-26-2005, 07:10 PM

Contact Randy's. I'm sure that they can get you setup with a great rear, for close to the same cost.

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