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#1
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Rear Tire Size and Wheel BS
My newly acquired 66 Lemans has a 12 bolt rear, supposedly from a 66 Chevelle. Does anyone know the maximum BS one can use with this rear and tire size if using a 15” wheel?
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '69 LeMans Vert, 350, #47 heads: work in progress |
#2
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Better check your casting code/dates on the housing to be sure first.
The 65-67 Chevelle 12-bolts were the 1" narrower ones (54.25") vs the 68+ (55.25"). 12-Bolt Housing: Casting # 1965 Chevelle 3859140N 1966 Chevelle 3875745N 1967 Chevelle 3894939NF 1967 Chevelle-Late 3917124NF 1968-Early 69 Chevelle 3917124NF 1969 Chevelle 3959038NF 1970-72 Chevelle 3969278NF For reference, I run a 15X10 with 5.5"BS & 28X12 M/T on the back of my 66.
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1966 GTO (Red) WARPATH 455CI TriPower 4-Speed 1965 GTO (Black) TRIPOWR 464CI TriPower 4-Speed 1965 GTO (Blue) 3X24SPD 464CI TriPower 4-Speed |
#3
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Thanks- good point and will do.
do your back tires fit under fender lip?
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '69 LeMans Vert, 350, #47 heads: work in progress |
#4
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Yes, but be advised that in my case, I also have wagon rear springs, and a later 55.5" width 8.2 10 bolt rear axle in this car.
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1966 GTO (Red) WARPATH 455CI TriPower 4-Speed 1965 GTO (Black) TRIPOWR 464CI TriPower 4-Speed 1965 GTO (Blue) 3X24SPD 464CI TriPower 4-Speed |
#5
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Thanks - mine has Catalina springs all around and I’d like to lower it between what it is now and factory height. I believe the Weld wheels in rear are 15x8 with 4.5 BS.
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '69 LeMans Vert, 350, #47 heads: work in progress |
#6
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The rear has the 66 Chevelle code:
3875745N with date code H215 But it has 4 wheel disc brakes so I assume it picks up about 1/2” from the rotors.
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '69 LeMans Vert, 350, #47 heads: work in progress |
#7
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I measured the rear wheels -15x9” with 5.5 backspace, currently 275/60 MT Drag radials with the little screws into the perimeter of the wheel lip. The fronts are 15x7”” wheels with 3.5 BS. I plan to install 15x8” wheels in rear with 255/60 tires and 215/70s in the front. I hope with the smaller rear wheel and tire combo I can put in springs with lower rate to get rid of that gasser look.
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '69 LeMans Vert, 350, #47 heads: work in progress Last edited by grivera; 05-15-2024 at 10:10 PM. |
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