Rear Lower Control Arm Commonality? - Chevy Impala SS Forum
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post #1 of 21 (permalink) Old 08-14-2017, 07:24 AM Thread Starter
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Rear Lower Control Arm Commonality?

Working on this 94 Fleetwood again and it needs rear lower control arm bushings; due to circumstances, I can't leave the vehicle disabled while I swap the bushings out - I can only do an immediate arm swap. I've already got new bushings and one 'spare' arm off a junked Fleetwood, but can't seem to find another dead Caddy's arm locally. My question is: do the rear lower control arms (correctly) interchange between all the B/D bodies of this era? Thanks.

Working on a 1994 Cadillac Fleetwood Brougham...
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post #2 of 21 (permalink) Old 08-14-2017, 07:29 AM
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Yes. All last gen B/D- are the same. I must admit not hearing many bushing failures - especially on a model such as a FWB.

\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear). Finally, wait for it... LT-4 knock module!
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, yes again... LT-4 knock module!
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post #3 of 21 (permalink) Old 08-14-2017, 07:43 AM Thread Starter
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Yes. All last gen B/D- are the same. I must admit not hearing many bushing failures - especially on a model such as a FWB.
The bushings haven't yet completely failed. However, they're clearly worn and long past their prime - seeing cracks in the bushings, etc., and they don't seem to be controlling the rear axle quite like they should any more. 23 years and 208K in the Texas sun, heat and ozone have not done the rubber parts on this car any good.

Working on a 1994 Cadillac Fleetwood Brougham...
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post #4 of 21 (permalink) Old 08-14-2017, 08:05 AM
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While you are under there, check the uppers as well. They are a little more difficult to swap out as a unbolt/bolt-up, because the axle bushing is attached to the axle not the arm. The uppers keep the axle centered.

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post #5 of 21 (permalink) Old 08-14-2017, 08:17 AM Thread Starter
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While you are under there, check the uppers as well. They are a little more difficult to swap out as a unbolt/bolt-up, because the axle bushing is attached to the axle not the arm. The uppers keep the axle centered.
During an earlier work session where we were able to get the car on a lift, we checked the uppers on the axle end and they looked to be in reasonable condition, unlike the lowers.

We've been thinking about trying to locate a V4P rear axle to get the limited slip and better gear ratio. Depending on what I find when it stops raining and I get a chance to get that rear wheel off to see what I've got going on with this loose rear brake backing plate, we may move that up the to-do list. We'll definitely be installing the upper bushings prior to installation should that occur.

Working on a 1994 Cadillac Fleetwood Brougham...
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post #6 of 21 (permalink) Old 08-14-2017, 09:04 AM
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Did ALL V4P get G80 Limited Slip? And therefore ABS Delete? Or were there different permutations? I know the 3.42 gears are attractive, but not if relinquishing ABS. For me anyway.

I installed a PowerTrax No-Slip in my FWB and quite pleased with greatly diminished 'throttle relaxer'.

\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear). Finally, wait for it... LT-4 knock module!
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, yes again... LT-4 knock module!
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post #7 of 21 (permalink) Old 08-14-2017, 09:38 AM Thread Starter
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Did ALL V4P get G80 Limited Slip? And therefore ABS Delete? Or were there different permutations? I know the 3.42 gears are attractive, but not if relinquishing ABS. For me anyway.

I installed a PowerTrax No-Slip in my FWB and quite pleased with greatly diminished 'throttle relaxer'.
I've no idea since there seems to be little information on the subject. I've not been able to find a V4P in the local scrapyards to check the theory and I've seen documentation either way. If we can find one in the junkyards, even if it doesn't have limited slip from the factory it isn't like it can't be added prior to axle installation (as you note) and it'd be far cheaper to set up with the axle on a bench at a shop than it would be in the car.

Working on a 1994 Cadillac Fleetwood Brougham...

Last edited by CB700S; 08-14-2017 at 09:41 AM.
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post #8 of 21 (permalink) Old 08-14-2017, 12:21 PM
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Did ALL V4P get G80 Limited Slip? And therefore ABS Delete? Or were there different permutations? I know 3.42 are attractive, but not if relinquishing ABS. For me anyway.
1stly, only Fleetwoods that did not come with any ABS were [possibly B9Q-Hearse, depending on other options ordered or deleted], V4U-Limo, & B05-Armour, all of which came with RPO J55. [RPO J55 did not come with ABS].

2ndly, I've no clue how many V4P also got G80.
Regardless, G80 in and of itself never required or otherwise caused to lose, delete or relinquish ABS on V4P, 9C1, WX3, WX8, B4U, or V92.

That is to say, ALL Fleetwoods, including Fleetwoods V4P, have 4Channel ABS, regardless of whether or not they also have G80 - except for Fleetwoods B9Q, V4U, &or B05.
[Nearly all RoadMasters, Caprices, and Impalas have 3Channel ABS, except for some limo & hearse conversions.]

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post #9 of 21 (permalink) Old 08-14-2017, 01:59 PM Thread Starter
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1stly, only Fleetwoods that did not come with any ABS were [possibly B9Q-Hearse, depending on other options ordered or deleted], V4U-Limo, & B05-Armour, all of which came with RPO J55. [RPO J55 did not come with ABS].

2ndly, I've no clue how many V4P also got G80.
Regardless, G80 in and of itself never required or otherwise caused to lose, delete or relinquish ABS on V4P, 9C1, WX3, WX8, B4U, or V92.

That is to say, ALL Fleetwoods, including Fleetwoods V4P, have 4Channel ABS, regardless of whether or not they also have G80 - except for Fleetwoods B9Q, V4U, &or B05.
[Nearly all RoadMasters, Caprices, and Impalas have 3Channel ABS, except for some limo & hearse conversions.]
Yeah, there's a factory Fleetwood limo being parted out at a local junkyard. IIRC, it looked like a different axle under the back, think it was a 12 bolt? Either way, the lack of ABS wheel speed sensors was conspicuous.

Working on a 1994 Cadillac Fleetwood Brougham...
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post #10 of 21 (permalink) Old 08-14-2017, 04:26 PM
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I've no idea since there seems to be little information on the subject. I've not been able to find a V4P in the local scrapyards to check the theory and I've seen documentation either way. If we can find one in the junkyards, even if it doesn't have limited slip from the factory it isn't like it can't be added prior to axle installation (as you note) and it'd be far cheaper to set up with the axle on a bench at a shop than it would be in the car.
What prompted my question in the first place was your prior post thinking you'd find a V4P rear somewhere with LS. Marky- provided a good rundown. He confirmed what I was pretty sure constitutes a tow package rear. It's just a better ratio in a normal 11" drum narrow rear with the Bosch 4-channel ABS.

Basically, LS and Cady's ABS / TC just don't go together. You give them up to get posi, or, slip in one of numerous designs of locker. I chose the 'usually off' No-Slip. There's options for 'usually on' too.

\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear). Finally, wait for it... LT-4 knock module!
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, yes again... LT-4 knock module!
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