Author Topic: Original 1971 JW 15" Rally II Wheels hitting Rear disk Caliper Mod  (Read 117 times)

chief poncho

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Wouldn't you know it.  I am almost positive I fit checked my wheels at one time in the past.  But last night I reinstalled my rear end and installed my wheels and tires  my wheels are contacting the caliper.  I think what I may have done, since I have a newer 15x7 rally II wheel is that I fit checked that wheel over the caliper and not one of my original 1971 JW's.  The JW rally wheels have the 14" center with a 15" rim, so they taper at the insert of the wheel.  The newer style Rally Wheel fits with plenty of clearance.  So, now I need to find a newer rally wheel or look at other options if I wan to keep my JW rims.

The clearance issue is very slight, and a wheel spacer might temporarily correct the problem, but is most likely not a long term solution.  Anyone ever grind a caliper for clearance?  That's most likely not something I will do, but if just a few millimeters gets me the clearance I need, it's not out of the question.  The other option is to see if I can offset the caliper installation slightly.

Maybe I should just sell the original JW wheels since they bring big dollars these days and buy a set of 17" aluminum rally wheels.
1971 Lucerne Blue Trans Am (455HO, Automatic) - currently my project car.
Previously Owned TA's/Musclecars: 2002 Pewter WS6/M6 Trans Am, 1968 Dodge Superbee 383/4speed,  1975 TA 455/4speed, 1989 Mustang LX 5.0/5speed, 1980 TA Indy Pace Car, 1977 TA 400/Auto, 1989 GTA 350TPI, 1990 GTA 350TPI, 1986 IROC 305TPI, 1989 Mustang LX 5.0/Auto, 1993 Mitsu 3000GT VR4 (and probably a few I've forgotten about)

LeighP

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Re: Original 1971 JW 15" Rally II Wheels hitting Rear disk Caliper Mod
« Reply #1 on: October 09, 2017, 06:29:57 PM »
I had an issue with some alloy replacement front calipers that were "supposed' to be able to fit where GM ones fitted.....but no, they touched. I ground a small amount off the casting (plenty of pointless meat where the problem was) and added a 3/16" spacer....fixed the issue without any problems.....this was for later 15" Rally IIs
Regards,
Leigh

Sydney, Australia
1969 Pontiac Firebird 400 coupe (project)

Former Firebirds -
1971 Pontiac Firebird 455
1977 Pontiac Trans Am
1976 Pontiac Trans Am
1967 Pontiac Firebird 400 convertible
1967 Pontiac Firebird 400 coupe


chief poncho

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Re: Original 1971 JW 15" Rally II Wheels hitting Rear disk Caliper Mod
« Reply #2 on: October 09, 2017, 10:17:32 PM »
Just checked the code on the wheel.  They are KR's not JW's.  Hmmmm....always thought they were JW's.  Anyway, I tried a 5/16 spacer and it still hits just barely, plus I would need longer studs.  I could try grinding the caliper, but I have a later 15 x 7 on the other side and it fits fine.  I might just pick up another 15" rally and try it.  The plan was a set of 17" aluminums anyway and have the stock rallys when I wanted a more stock look.
1971 Lucerne Blue Trans Am (455HO, Automatic) - currently my project car.
Previously Owned TA's/Musclecars: 2002 Pewter WS6/M6 Trans Am, 1968 Dodge Superbee 383/4speed,  1975 TA 455/4speed, 1989 Mustang LX 5.0/5speed, 1980 TA Indy Pace Car, 1977 TA 400/Auto, 1989 GTA 350TPI, 1990 GTA 350TPI, 1986 IROC 305TPI, 1989 Mustang LX 5.0/Auto, 1993 Mitsu 3000GT VR4 (and probably a few I've forgotten about)

Re: Original 1971 JW 15" Rally II Wheels hitting Rear disk Caliper Mod
« Reply #2 on: October 09, 2017, 10:17:32 PM »
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