: Is an Impala SS rear a simple bolt in for a '91 Fleetwood?



Destroyer
01-03-07, 04:03 PM
Dont know if any of you guys can help but I found a '96 Impala SS rear complete with 3.73 gears and and disk brakes for sale. Can I simply take out my rear and install this one as a bolt in?. Will the disk brakes work or do I need a new master cylinder and/or whatever else?. This is for my '91 FWB.

codewize
01-03-07, 11:42 PM
I don't know about the 91 but most of that stuff works on the 93 - 96 Fleetwoods. The steering box is also an excellent swap on that. Isn't the 91 still the classic square body style? I don't think that will fly at all.

Destroyer
01-04-07, 12:17 AM
I don't know about the 91 but most of that stuff works on the 93 - 96 Fleetwoods. The steering box is also an excellent swap on that. Isn't the 91 still the classic square body style? I don't think that will fly at all.
The old classic style has the same frame as the 93-96. I'm already using Impala SS suspension and wheels. What I need to know is if everything will be bolt-on (i.e. any changes in bolt locations, etc.) and what if any modifications would have to be done to the braking system to accomodate the rear disk brakes. The whole reason I'm modifying a '91 Fleetwood is because it shares the same platform as an Impala SS and nobody else seems to be doing it. The steering box is on the list of mods cause even though I have rebuilt the front end and lowered the car with Intrax lowering springs (front) and stock Impala SS springs (rear) plus KYB shocks, the steering itself is too light.

codewize
01-04-07, 12:25 AM
Ohh sweet. I had no idea that those were the same frame. Learn something new every day. In that case I don't know the answer. :( sorry.

96Fleetwood
01-04-07, 11:31 AM
Check this thread out:

http://impalassforum.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=35;t=001648

Destroyer
01-04-07, 02:46 PM
Check this thread out:

http://impalassforum.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=35;t=001648
Well that answers that. Got the answer for the brakes I was looking for as well. Once again, thanks for the help. If it werent for you I probably wouldn't have even known all the SS stuff works on my car.:D

brougham
01-04-07, 04:43 PM
Almost everything about the 1991 and 1992s is the same as Fleetwoods except for how they look. 1990 Broughams look the same but theyre more like the 1980s ones.

BCs71
01-04-07, 05:25 PM
You probably already know this, but just an FYI the Impala SS 1994-6 only came with 3.08 posi.
The 3.73s, if in there, are aftermarket. May want to double check that that's what you're getting....

Destroyer
01-04-07, 07:20 PM
You probably already know this, but just an FYI the Impala SS 1994-6 only came with 3.08 posi.
The 3.73s, if in there, are aftermarket. May want to double check that that's what you're getting....
Yes the rear has aftermarket gears. Thanks though.

Destroyer
01-04-07, 07:45 PM
Check this thread out:

http://impalassforum.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=35;t=001648Any idea if he needed to run new brake lines for the disk brakes and if the driveshaft or u joints needed to be changed?. Thanks man.

N0DIH
01-05-07, 01:45 AM
Driveshaft should be fine. But according to Car-Part.com, the 77-92 shafts interchange, and the 93-96 interchange. Might be minor, so check, I am pretty sure lengths didn't change, as long as it is a 8.5" to 8.5" not a 7.5, those will be different.

No on brake lines. But you might need some minor tweaks. Check with NavyLifer, Bill Harper, I would be willing to bet he knows.

Destroyer
01-06-07, 11:19 AM
Thanks for the tips Nodih but I lost the auction for the rear damnit!!!. I'll be on the lookout for another SS/9C1 rear hopefully locally but I really wanted that one cause it had the 3.73 gears in it. Oh well.

N0DIH
01-06-07, 11:32 PM
Check ImpalaSSForum, they seem to pop up plenty. And never forget to check car-part.com, they ALWAYS have them there, I even see a few 93 3.73 axles on there from the uber rare V4P 1993 Fleetwood.

What was the auction win price?

codewize
01-07-07, 09:06 PM
I have a question about the steering box thing. Is the box in the Impala variable assist like the brougham?

N0DIH
01-07-07, 11:51 PM
Yes, unfortunately it is.

I highly recommend the 1992 WS6 Trans AM box as a replacement. 12.7:1 (2 turns lock to lock) constant ratio, best road feel of any box out there.

codewize
01-09-07, 01:14 AM
Well if that box is good and you don't want it I'll put it in my 93 Brougham. I think the box in that is about shot.

N0DIH
01-09-07, 02:25 AM
The box isn't variable assist, the pump is. The box is std, pretty much any GM car from 80-96, RWD that uses the 800 series box. The 600 series box should be avoided.

codewize
01-09-07, 06:13 PM
Doesn't the box have an extra (3rd) connector on it? Maybe that's only on R&P steering?

Ok well then are you using that steering box?


The box isn't variable assist, the pump is. The box is std, pretty much any GM car from 80-96, RWD that uses the 800 series box. The 600 series box should be avoided.

N0DIH
01-09-07, 07:03 PM
The connector is on the pump, not the box. The box is plain jane old school box. They way I like it!

I will get a WS6 Box one of these days, as mine leaks some, I need to anyway, it would be nice to have a quick turn box. For now, stock is all I have....

codewize
01-09-07, 08:04 PM
Ohh what the heck am I thinking. I keep thinking you have the whole car. :banghead:

Sorry I forgot you had just the rear. DOH!



The connector is on the pump, not the box. The box is plain jane old school box. They way I like it!

I will get a WS6 Box one of these days, as mine leaks some, I need to anyway, it would be nice to have a quick turn box. For now, stock is all I have....