Cadillac Commercial Chassis - Chevy Impala SS Forum
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post #1 of 60 (permalink) Old 12-27-2016, 06:42 PM Thread Starter
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Question Cadillac Commercial Chassis

Hello, I hope you all are enjoying your Holiday Season.

I have stumbled across a 1996 Cadillac Commercial Chassis...a very long funeral flower car. It has the 2-3/4" rear brake shoes, braking system for 7001-8000# gvw. I am wanting to pull the front LCA's, spindles, and rear end and transplant into my B4U Caprice.

What are the pro's and con's? Looking for the improved braking power, 5/8" front lower ball joints, and the 3:42 posi rear. I believe there the benefit of adding an extra 1.5" to the rear track too.

VIN = 1gefh90p3tr711722...can anyone decode?

Thoughts, please.

Greg

Greg

\'96 DGGM B4U, 147k - PMCAIS, Impala grille, wheels, and tail lights, SEO p/s cooler, slotted rotors, Hawk pads, Scott Mueller body bushing mounts, Bilstiens
\'95 Caprice Classic Wagon, MGR, 218k - PMCAIS, TB Bypass, SEO ps cooler, SEO hoses, WX3 wheels (in the summer) - Rest In Pieces 6/13/12 1630
\'83 Caprice Classic Wagon, 117k Rest in Pieces 10/23/05 1306
\'75 Caprice Classic Convt, 61K The original LT4 (400 SBC)
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post #2 of 60 (permalink) Old 12-27-2016, 10:17 PM
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Front end aint a bad idea. But didnt all 96 cars have.the bigger balljoints? Not bein an idiot but wouldnt the wider track be a negative to the handling? And also arent the Dbody frame axle mounts farther apart than the Bbody axle? Could you just transplant all rear braking to ur axle or find SS rear? Unless of course u prefer drums.

Also... got a pic of said caddy? Thats like an el camino aint it? Id rock that thing if its driveable... itd be like a 'classy' mullet

96 BBB 9c1. Rebuilt out of lets just say north of 30 cars.
94 MGR L99. Met a bridge.
92 White L03. Ran to death.
94 OSP 9C1. Lawn ornament.
91 Silver L03. Whales on ice is sad.
94 Black 9c1 clone. Sacrificed.
92 DCM to flat black L03 RMW. Blowed up... twice.
96 Black Woody RMW. Cannibalized.
92 Grey RMS L05. New daily driver.
"i built it one piece at a time, and it didn't cost me a dime!" Johnny Cash

Last edited by Shilaeli Hugger; 12-27-2016 at 10:20 PM.
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post #3 of 60 (permalink) Old 12-28-2016, 08:07 AM
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I believe the FW rear axle mounts are the same as the B body. The rear track should be about the same as a B4U, because the FW has fender skirts, and is limited in axle width. Some people have successfully installed a sedan rear in a wagon, so even if the mounts are a little off, it will still work, unless you are road racing. The wider the track, the better the handling in general. If the rear track is noticeably wider than the front, the car can have a tendency to oversteer in road racing conditions. You should measure the rear, and compare it directly to your original one. Guessing, assuming, or thinking something usually gets you in trouble.


The FW rear may not be equipped for antilock brakes, so check it before installation.


The only B bodies that had the larger BJs were the late police versions.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #4 of 60 (permalink) Old 12-28-2016, 11:54 AM Thread Starter
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Thanks guys...+1 on the 5/8 ball joints on the 9C1's, but the commercial chassis got them too...it also has a huge front rotor, a good 3/8" thicker than a standard B body. That is the Cadillac J55 brakes, I think. I guess the wider rear track would come from the 3/4" wider rear brakes. I guess I could just pull the drums and brake hardware. It will push the wheel out another 3/4" each side...only concern would be rear wheel bearing loading/center. Guess I could run it until I blow-out a bearing

The rear is a 14-bolt with a 9" ring gear..out to be bullet-proof.

Unfortunately, the entire car is not available...it is at a pick and pull near me. The front clip and lf LCA, spindle, and brake hardware are already gone.
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post #5 of 60 (permalink) Old 12-28-2016, 03:28 PM
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I would measure the rear brakes before doing any swapping of the brakes to your original axle. Your axles may not be long enough. If you are going to use the rear brakes swap the whole rear.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #6 of 60 (permalink) Old 12-28-2016, 06:55 PM
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Just note that the front hubs are huge. I can't fit my wheel caps for any of my wheels properly. Also on the 9.5 inch 14 bolt rear the backing plates are much different than the 8.5 inch 10 bolt so no way to just swap brakes. The rear will fit just fine but will need a new drive shaft as the way it fastens to the rear is different. Also I believe the rear gear is 3.63 or 3.66 in the 14 bolt.


Neil P.
1996 Federal hearse. CAI, Delphi 3.5 MAF, Aluminum elbow, airfoil, coolant bypass mod, 36lbs injectors, LE 223/231 110 LSA cam, Trickflow pushrods, Comp Cams rocker studs, Lunati 1.6 roller rockers,double spring kit and lifters, F-body heads, Cometic MLS .027 head gasket, Hooker headers, Cloyes timing chain, PowerBond balancer, EGR, air pump and AC delete. Solomon tune. CPT Pro-Race trans, 9.5 inch 3200 stall converter, 9.5 inch 14 bolt rear, 4.10 gear and TruTrac helix gear diff
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post #7 of 60 (permalink) Old 12-28-2016, 09:43 PM
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You can check the SPID for the gear ratio. 3.73 is GT4.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #8 of 60 (permalink) Old 12-28-2016, 10:46 PM
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Unfortunately I have no RPO codes as they are normally under the trunk lids in the Fleetwoods. And hearses have no trunk lids. The commercial chassis are called chassis incompletes and are only complete from the front doors forwards. Then the coach builder builds everything from there back as well as the roof with most of it being some kinda fiberglass/plastic type stuff. Some hearses have steel rear end doors. Mine is the fiberglass/plastic stuff. the rear side doors are steel though.


Neil P.
1996 Federal hearse. CAI, Delphi 3.5 MAF, Aluminum elbow, airfoil, coolant bypass mod, 36lbs injectors, LE 223/231 110 LSA cam, Trickflow pushrods, Comp Cams rocker studs, Lunati 1.6 roller rockers,double spring kit and lifters, F-body heads, Cometic MLS .027 head gasket, Hooker headers, Cloyes timing chain, PowerBond balancer, EGR, air pump and AC delete. Solomon tune. CPT Pro-Race trans, 9.5 inch 3200 stall converter, 9.5 inch 14 bolt rear, 4.10 gear and TruTrac helix gear diff
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post #9 of 60 (permalink) Old 12-29-2016, 06:33 AM
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Then get out the marker, and put a mark on the top of the wheel/axle, and count the turns of the pinion shaft to make one revolution of the axle. 3.73 is about 3 3/4 turns. 3.66 is 3 an 2/3 turns, etc. You do not have to open it up to find out what gears it has.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #10 of 60 (permalink) Old 12-29-2016, 11:01 AM
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Quote:
Originally Posted by Fred Kiehl View Post
Then get out the marker, and put a mark on the top of the wheel/axle, and count the turns of the pinion shaft to make one revolution of the axle. 3.73 is about 3 3/4 turns. 3.66 is 3 an 2/3 turns, etc. You do not have to open it up to find out what gears it has.

Won't help the previous owner stuck 4.10's in it with a TruTrac diff.


Neil P.
1996 Federal hearse. CAI, Delphi 3.5 MAF, Aluminum elbow, airfoil, coolant bypass mod, 36lbs injectors, LE 223/231 110 LSA cam, Trickflow pushrods, Comp Cams rocker studs, Lunati 1.6 roller rockers,double spring kit and lifters, F-body heads, Cometic MLS .027 head gasket, Hooker headers, Cloyes timing chain, PowerBond balancer, EGR, air pump and AC delete. Solomon tune. CPT Pro-Race trans, 9.5 inch 3200 stall converter, 9.5 inch 14 bolt rear, 4.10 gear and TruTrac helix gear diff
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