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  • BW1372/BW4472 Information

    The following information I've gathered over the years from transfer cases I've either had, worked on, or just seen in my travels. It basically answers the question "what transfer case can I use to replace my broken one?"

    The short answers are;
    Syclone owners can use cases from 1990-1995 Astro/Safari and the case from the 1991 Bravada
    Typhoon owners can use cases from 1993-1995 Bravada/AWD Blazer. I have not confirmed if the 1992 Bravada case is the same, but I believe it should be.

    The only part an owner my need to swap over would be the front output flange for the propshaft. Syclones and Typhoons both use the same size flange, which GM lists as 4.5" (it actually measures 4.25"). GM also lists the flange on the Bravada case as 5". Another twist is that if you look up a replacement transfer case at salvage yard, they list the flange sizes as being 3.5" or 4.5", but just so everyone is clear, as long as the output shaft is the correct number of splines for your application, it should be a safe purchase because the flange can be swapped, in fact the "guts" of all of these cases are interchanable.
    GM Number
    BW No.
    Group
    Years
    Models
    Trans Flange
    Out. Flange
    Out. Spline
    Tail Housing
    Length
    Front Case
    Rear Case
    15648651
    4472-01
    100
    '90-'95
    Astro, Safari
    4.13"
    4.5"
    27
    13-72-066-901
    5"
    13-72-039-901
    13-72-065-901
    15989331-DA
    100
    '90-'95
    Astro, Safari
    4.13"
    4.5"
    27
    5"
    13-72-039-901
    13-72-065-901
    15672918
    4472-04
    100
    '90-'95 ('91)
    Astro, Safari, Brav. (Sy)
    4.13"
    4.5"
    27
    13-72-066-901
    5"
    13-72-039-901
    13-72-065-901
    15963557
    4472-09
    100
    '90-'92, '94-'95
    Astro, Safari
    4.13"
    4.5"
    27
    13-72-066-902
    5"
    13-72-039-901
    13-72-065-901
    13-72-066-902-C
    5"
    15959501
    4472-??
    '93
    Astro, Safari
    4.5"
    13-72-039-901
    13-72-065-901
    15685141
    4472-06
    102
    '93-'94 ('92-'93)
    Blazer/Bravada (Ty)
    4.13"
    5" (4.5")
    32
    44-72-066-901-B
    6.9375"
    13-72-039-901
    13-72-065-901
    15960128
    102
    '95
    Blazer/Bravada
    4.13"
    5"
    32
    44-72-066-901-B
    6.9375"
    13-72-039-901
    13-72-065-901
    15703287
    103
    '96-'97
    Blazer/Jimmy/Bravada
    4.90"
    32
    44-72-039-903
    13-72-065-901
    15703287-DB
    103
    '96-'97
    Blazer/Jimmy/Bravada
    4.90"
    32
    44-72-039-903
    13-72-065-901
    15026806
    4472-13
    103
    '96-'97
    Blazer/Jimmy/Bravada
    4.90"
    5"
    32
    44-72-039-903
    13-72-065-901
    15026806-NX
    103
    '96-'97
    Blazer/Jimmy/Bravada
    4.90"
    5"
    32
    44-72-039-903
    13-72-065-901
    15998931
    4472-11
    101
    '96-'98
    Astro, Safari, Bravada
    4.90"
    27
    13-72-066-902
    44-72-039-903
    13-72-065-901
    13-72-066-902-C
    15998991
    101
    '96-'98
    Astro, Safari, Bravada
    4.90"
    27
    44-72-039-903
    13-72-065-901
    Morgan - ISTR Executive Director

    93 Typhoon #0180 || 93 Typhoon #1579 || 92 Typhoon #1068 || 52 Cadillac Series 62 Coupe
    85 Volvo 745 Turbo Diesel || 06 GMC Sierra 3500 4x4 CCLB SRW LBZ SLT || 07 CGMC Sierra 2500HD 4x4 CCSB LBZ SLT

    WTB : 93 Typhoon #1682

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  • #2
    Morgan - ISTR Executive Director

    93 Typhoon #0180 || 93 Typhoon #1579 || 92 Typhoon #1068 || 52 Cadillac Series 62 Coupe
    85 Volvo 745 Turbo Diesel || 06 GMC Sierra 3500 4x4 CCLB SRW LBZ SLT || 07 CGMC Sierra 2500HD 4x4 CCSB LBZ SLT

    WTB : 93 Typhoon #1682

    Facebook | Instagram | Twitter | YouTube

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