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  • Narrow rear??

    I am bagging and bodydropping my 98 fullsize truck. I know that a impala ss rearend is narrower than a fullsize truck rear but someone told me that a caprice rear is even narrower than a impala ss rear??? Is this true or B/S???

  • #2
    Re: Narrow rear??

    They're BS'ing you. Impala and Caprice are the same car, just trim level differences. Same width rear.

    Richard

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    • #3
      Re: Narrow rear??

      I think the impala ss had the truck bolt pattern and the impala had the camaro s-10 bolt pattern.
      2004 GMC Seirra ECSB 4X4 5.3 AUTO
      :fsc:
      Originally posted by someotherguy
      It's always easier to ask forgiveness, than ask permission!

      Richard

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      • #4
        Re: Narrow rear??

        Originally posted by fastlt1 View Post
        I think the impala ss had the truck bolt pattern and the impala had the camaro s-10 bolt pattern.
        As in axle to wheel bolt pattern? I highly doubt that it would be a 6 lug not to mention it would take a lot of cutting and welding to remove the mounts from both and weld them back onto the new rear end, since it isn't a bolt in swap.

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        • #5
          Re: Narrow rear??

          Originally posted by mudbuddy View Post
          As in axle to wheel bolt pattern? I highly doubt that it would be a 6 lug not to mention it would take a lot of cutting and welding to remove the mounts from both and weld them back onto the new rear end, since it isn't a bolt in swap.
          I figured by the pic he was bagging a OBS 5 lug 2wd truck.
          2004 GMC Seirra ECSB 4X4 5.3 AUTO
          :fsc:
          Originally posted by someotherguy
          It's always easier to ask forgiveness, than ask permission!

          Richard

          Comment


          • #6
            Re: Narrow rear??

            I had a awd astro van that was a truck 5 lug but I don't know how wide. I think a OOBS 2wd axle is a couple inches shorter then a OBS axle.
            2004 GMC Seirra ECSB 4X4 5.3 AUTO
            :fsc:
            Originally posted by someotherguy
            It's always easier to ask forgiveness, than ask permission!

            Richard

            Comment


            • #7
              Re: Narrow rear??

              if you have the tools to cut off the old brackets off a shorter axle and weld on yours you should have the tools to shorten your stock axle. i never did it but the jeep guys do it to dana 60s all the time. they even do it with steer axles. it will probably be cheaper than buying an impala ss rear and you can cut it to the exact length you want. the most expensive part will be getting your shafts cut and resplined. a machine shop can do that and i dont think its to bad
              Last edited by BlackBlazer92; 01-26-2011, 10:42 AM.
              1992 black 454 ss -2400 dollar beater dd

              1989 jeep cherokee cut 2 door-
              cage, 4.56 locked d30 d44, 4.0l aw4 np231, 36x14.5 tsl radials, xrc8 winch, custom bumpers and bodywork, off road machine

              1967 baja bug, dp1600, bus portal ends- currently in resto

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              • #8
                Re: Narrow rear??

                Originally posted by fastlt1 View Post
                I think the impala ss had the truck bolt pattern and the impala had the camaro s-10 bolt pattern.
                Nope...Caprice or Impala SS, 5x5 pattern, both of 'em. There were some B-body cars in the early/mid 80's, and also in the 60's-up that had 5x4.75, but it was fairly common to see 5x5. Example; my '71 Impala convertible had 5x5; my '65 Impala SS had 5x4.75. All the later model Caprices I've owned were 5x5 - and that's 4 or 5 of them.

                Originally posted by mudbuddy View Post
                As in axle to wheel bolt pattern? I highly doubt that it would be a 6 lug not to mention it would take a lot of cutting and welding to remove the mounts from both and weld them back onto the new rear end, since it isn't a bolt in swap.
                When fastlt1 said "truck" pattern he meant 5x5, since the original poster is talking about a '98 fullsize truck. But yes, would require spring pad and shock mount modification and relocation. The Impala SS rear is coil sprung with trailing arms, instead of leaf sprung like the truck.

                Originally posted by fastlt1 View Post
                I had a awd astro van that was a truck 5 lug but I don't know how wide. I think a OOBS 2wd axle is a couple inches shorter then a OBS axle.
                Another mixed example - some Astros were 5x4.75, some were 5x5, and of course the later ones are 6 lug. Dunno about whether squarebody axles are narrower than GMT400 but they might be; could explain why the stock backspacing on the wheels was less than the GMT400 stuff.

                Richard

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                • #9
                  Re: Narrow rear??

                  Well thanks for the help gus, yeah i kinda figured it was the same rearend. I just hope its narrow enough to run my rims, i really dont want to get them narrowed.

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                  • #10
                    Re: Narrow rear??

                    Are you guys sure the rear axle is the same between the SS and the Caprice? The SS (and police package Caprice) used rear discs, but the regular Caprice used drums. While it may be possible the different brakes bolt onto the same axle it's just as possible that they don't.
                    454cid
                    1999 K3500 RCLB

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                    • #11
                      Re: Narrow rear??

                      Yep, Impala SS/Caprice 9C1 have the JL9 disc/disc RPO; regular Caprice has JM4 disc/drum - but if you look at how the exact same wheels fill the gap (check a Caprice Classic with Impala SS wheels) I'd say the rears are the same width, within an inch or less. As tight as those rear wheelwells are, I'd say no significant difference.

                      You do bring up a valid point though, since all the late model Caprice's I've owned have been 9C1's.

                      Richard

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                      • #12
                        Re: Narrow rear??

                        One more thing, can somebody tell me what the stock gear ratio would be in a impala ss rear?

                        Comment


                        • #13
                          Re: Narrow rear??

                          You guys are actually all wrong. And yes to the Op, you were not being BS'd. There are 2 rear diff widths in the 94-96 B body disc brake cars. The Impala SS rear end is not a direct swap for a 9C1 width wise. The 9C1 axles are shorter and the housing is in fact narrower than an Impala SS.
                          GM PART # 26038684
                          GM LIST: $328.83
                          DEALER COST: $194.93
                          DESCRIPTION: SHAFT,R/A - Caprice 9C1 w/rear disc (8.5/30 narrow)

                          GM PART # 26018080
                          GM LIST: $249.19
                          DEALER COST: $147.72
                          DESCRIPTION: SHAFT,R/A - Caprice sedan, Buick Roadmaster sedan w/rear drum (8.5/30 narrow)

                          GM PART # 26043164
                          GM LIST: $353.88
                          DEALER COST: $209.78
                          DESCRIPTION: SHAFT,R/A - Impala SS - rear disc (8.5/30 wide)
                          NOTE can be used in place of 26033203 on B4U Caprice applications (26033203 discontinued)


                          The overall width between the "narrow" and the "wide" housings is approximately 1.25". So a narrow axle shaft is 30.5" and a wide is 31.125 approximately. The drum brake cars are a direct swap for the rear disc setup as well if you find a narrow rearend to steal. All 91-96 B bodies used the 5X5" bolt pattern as well. Older square bodies( 1977-1990) are 5X4.75" bolt pattern unless they are a station wagon or a 9C1 package car and then they are 5X5". Furthermore the old 77-90 Caprices had 7.5" 10 bolts if they were not a wagon or a cop car. So.... all the 5X4.75" cars have a garbage rear diff.

                          Caprice w/Disc Brakes 91-96, Cadillac RWD 91-92, Buick 91-96 Also includes 91-92 Caprice with drum brakes and some 93-96 (ie. taxi) with drum brakes (does NOT include 93-96 B4U Caprice which uses wide housing)
                          Those use the narrow rear end housing, and "narrow" axle.

                          The factory gear ratio in an LT1 powered 94-96 Impala SS or 9C1 is 3.08, or RPO GU4. The L99 ( 4.3) powered 9C1's have 3.23 gears ( RPO GU5). The LT1 powered Caprice's otherwise from 94-96 ran 2.93's. Buicks and Caddies I don't know all of for sure. The TBI powered 9C1's ran 3.42's.

                          3.42 is a nice driving ratio in an LT1 b body and is what I put in when I rebuilt my 96 9C1's rear diff a few months ago. If you want more info on this stuff you can go to the site I pulled the quotes from, being www.impalassforum.com
                          Last edited by Badass69; 01-27-2011, 08:51 AM.
                          JUST FOR CLARIFICATION

                          I hate GMT900 trucks period.

                          Comment


                          • #14
                            Re: Narrow rear??

                            Originally posted by Badass69 View Post
                            You guys are actually all wrong. And yes to the Op, you were not being BS'd. There are 2 rear diff widths in the 94-96 B body disc brake cars. The Impala SS rear end is not a direct swap for a 9C1 width wise. The 9C1 axles are shorter and the housing is in fact narrower than an Impala SS.

                            The overall width between the "narrow" and the "wide" housings is approximately 1.25".
                            Originally posted by someotherguy View Post
                            if you look at how the exact same wheels fill the gap (check a Caprice Classic with Impala SS wheels) I'd say the rears are the same width, within an inch or less. As tight as those rear wheelwells are, I'd say no significant difference.
                            So sue me for being off 0.25"

                            Richard

                            Comment


                            • #15
                              Re: Narrow rear??

                              Originally posted by someotherguy View Post
                              They're BS'ing you. Impala and Caprice are the same car, just trim level differences. Same width rear.

                              Richard
                              More what I was in reference too, and no I was not talking directly to one individual in the thread. It's not much, but GM did it for whatever reason.

                              No I am not picking on anyone either:punch:
                              Last edited by Badass69; 01-27-2011, 09:37 AM.
                              JUST FOR CLARIFICATION

                              I hate GMT900 trucks period.

                              Comment

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