rearend swap - Chevy Impala SS Forum
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post #1 of 16 (permalink) Old 11-16-2014, 01:25 AM Thread Starter
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Post rearend swap

Can a 95 9c1 rear end with a 3.73 gear differential fit on a 93 Buick road master with the tow package? Please help!!
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post #2 of 16 (permalink) Old 11-16-2014, 09:51 AM
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physically yes, but are disk or drum brakes? reflash the computer for the gears. possible drive train vibration? new high speed drive shaft?

its' not easy, but someone has to do it
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post #3 of 16 (permalink) Old 11-16-2014, 11:39 AM
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Yes it will work. You will have to re-calibrate your spedo, but I believe the TBI cars did this via a new gear in the tranny. No re-program necessary. 3.73:1 ratio should not cause you any troubles with vibration unless something is not correct to begin with. The disk will work fine. If you do the brake bolt mod it would make the discs more effective.

If you have the tow pack what rear do you have now? Some of the Roady Sedans (assuming we are talking about a sedan) tow pack cars came with 3.73:1 gears.

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post #4 of 16 (permalink) Old 11-16-2014, 02:22 PM
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Quote:
Originally Posted by BigBlackBeaSSt View Post
Yes it will work. You will have to re-calibrate your spedo, but I believe the TBI cars did this via a new gear in the tranny. No re-program necessary. 3.73:1 ratio should not cause you any troubles with vibration unless something is not correct to begin with. The disk will work fine. If you do the brake bolt mod it would make the discs more effective.

If you have the tow pack what rear do you have now? Some of the Roady Sedans (assuming we are talking about a sedan) tow pack cars came with 3.73:1 gears.
Correct but it well documented that the stock driveshaft will cause vibration that the 3.08s don't really show until it spins faster with the 3.73's. The 3.73 will show a problem with the DS that the 3.08 never had.

I never really noticed a problem with vibration when cruising up to 80-90 MPH until I swapped in another rear with 3.73 gear. With 3.73 I would get a small but noticeable vibration at about 65-70 MPH. Switched over to a balanced Dynotech DS and the problem was instantly fixed.

BTW - check for posts by member Goldmaster. He has done this swap in a RM before and may have some info that would be helpful.

================================================== =============


'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to do...it never ends.

Last edited by 4DoorSS; 11-16-2014 at 02:25 PM.
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post #5 of 16 (permalink) Old 11-16-2014, 06:32 PM Thread Starter
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Thank you both for that info, it is a 93 RMS and it has a hitch on the back so I'm assuming I have at least 2.92's in it now. I doubt that it had the 3.73's in it already because it doesn't pick up fast enough to have that feel to it and it currently has drum brakes on it


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post #6 of 16 (permalink) Old 11-16-2014, 06:33 PM Thread Starter
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And I will definitely look up Goldmaster's post thanks


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post #7 of 16 (permalink) Old 11-16-2014, 09:11 PM
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My impala ss and wagon both had 3.73 and stock drive shafts and neither had an issue. Luck of the draw I guess.

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post #8 of 16 (permalink) Old 11-16-2014, 09:48 PM Thread Starter
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How is the gas mileage on the 3.73's?


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post #9 of 16 (permalink) Old 11-17-2014, 06:43 AM
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How is the gas mileage on the 3.73's?


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It will go down a little, but there are obvious trade-offs as you will turn more RPM's when crusing. You are also making the car more spirited to drive and your right foot will help dictate how many MPG's you will lose.

This has been discussed quite a bit before. Just get familiar with the search function and you will find lots to read.

================================================== =============


'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to do...it never ends.
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post #10 of 16 (permalink) Old 11-17-2014, 06:51 PM Thread Starter
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Thank you I appreciate the info again


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