Rearend Widths - Chevy Impala SS Forum
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post #1 of 42 (permalink) Old 02-06-2010, 07:31 PM Thread Starter
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Rearend Widths

Im not sure is this belongs here, in wheels and tires, exterior, or suspension. Can we get a list of what rearends are what widths? I know it used to be on here but I searched some and I think its gone. I'd like to know widths for drum, Civie Disc (did those exist?), 9C1, Impala, Fleetwood, and Wagon rearends. TIA!

-Matt Brady

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post #2 of 42 (permalink) Old 02-06-2010, 08:00 PM
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Chevy
91-92 sedan
1566mm - narrow (all)

93-96 sedan
1566mm - narrow (9C1 - disc & drum & some other drum applications)
1598mm - wide (Impala SS - disc & B4U - drum)

Buick 91-96 & Fleetwood 93-96 sedans
1566mm - narrow (all)
NOTE: Fleetwood housing is unique to the application - 4-channel ABS provisions

91-96 wagon, all
1642.5mm

All 93-96 7.625" (ring gear) housings are 1598mm wide (Chevy sedan only)

Sedan housings, in both widths, have the same lower control arm bracket location/spread distance, and will fit any other sedan frame. Wagons have a wider spread distance (approx. 2") between lower control arm brackets on housing, and corresponding wider frame lower control arm mounts.

8.5" axle shaft information - sedans only

Bill Harper
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Last edited by Navy Lifer; 07-18-2010 at 10:09 PM.
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post #3 of 42 (permalink) Old 02-06-2010, 08:14 PM
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Quote:
Originally Posted by matthimself456 View Post
Civie Disc (did those exist?)
Yes, in the WX3, but I think you meant the non-9C1, non-SS B-bodies, in which case, no. In fact of all the 91-96 B/D-bodies, only the 94-96 SS and 9C1 got rear discs.

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Last edited by Kevin Moore; 02-06-2010 at 08:16 PM.
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post #4 of 42 (permalink) Old 02-06-2010, 08:48 PM Thread Starter
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Thanks! I was mostly curious but now its here and easily search-able again.

-Matt Brady

1996 RMW: under a perpetual knife
Other Cars: also under said knife
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post #5 of 42 (permalink) Old 07-08-2010, 08:03 PM
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My 95 B4U in fact has the wider axles in it. I measured them when I switched it to discs from HD drums years ago. Turns out Im on the hunt for some myself. finally putting my gears in and found the axles just starting to wear.

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post #6 of 42 (permalink) Old 07-09-2010, 09:02 AM
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The B4U does. You will need the longer ones. I bought Mosers for mine last year. Still have my stock ones just incase.

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post #7 of 42 (permalink) Old 07-18-2010, 01:12 AM
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just wondering? What was the reason for the Narrow rear end in the 9C1's

1994 Bermuda Blue 9C1

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post #8 of 42 (permalink) Old 07-18-2010, 01:41 AM
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Quote:
Originally Posted by rtigues View Post
just wondering? What was the reason for the Narrow rear end in the 9C1's
To allow for the use of snow chains.

Jim B.

'95 9c1, pcmperformance.com 93 tune, Dynomax Ultraflo catback, K & N box filter, LT4 KM, 160 stat, 3.08 Posi.
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post #9 of 42 (permalink) Old 07-18-2010, 07:24 AM
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I've made the same statement a number of times--lost to the data crash--but more to the point, prior to the 1993 body change, all 91-92 sedan housings were the narrow (1566mm) variety, which was originally dictated by the shape of the rear wheel opening.

I'm not aware of any "official" statement from within GM regarding the housing width "spec" or choice based on intended use of the vehicle, but, when the difference in width first surfaced as a Forum topic back in the first or second year of the Forum, when the learning curve was pretty steep and there was a constant barrage of questions about many of the vehicle design basics of the B-body, I said then that the only reasonable explanation was that, as an emergency service vehicle, the expectations would include the ability to fit snow chains without any concern about body clearance.

If it's anything other than that, something even more fundamental, I don't think we'll be hearing from GM about it. If it IS in writing--such as buried in the GM 9C1 specs, or in the MSP (Michigan State Police) patrol vehicle evaluation program historical files, it would be nice to find out and be able to validate the assumption.

Bill Harper
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post #10 of 42 (permalink) Old 07-18-2010, 12:13 PM
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is there a way to put the fleetwood abs/ traction control system on a impala ss?

Dan Diani
1995 SS BBB T56 4.10s
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