super10brss
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I have a 1989 Chevy 1500 that I am getting ready to LS swap in the next few months, and seen some stuff about 6 lug conversions. I have a 10 bolt disc brake 3:42 now that I like, but it is a open diff rear axle. I know a LS will eAt one tire all up! The front is "easy" I guess (cut and dry would be a better term) swap spindles and order new rotors (because my truck is 1989 I have the light duty brakes) Got It!
The rear end is where I am STUCK! Like I said I have a 3:42 disc brake rear (swapped out to the 3:42 from 2:08's couple years ago with the disc brake conversion, Impala ss based setup from several years back) Why can't I use a 99-2006 GMT800 rear that already has disc brakes and "maybe" a G80. Seems the 99-06 lots of them had G80's. I have SEARCHED and searched the ol interweb's and found:
The GMT 400 style 14 bolt 9.5 from 88-98 6 lug is. (same as 1/2 ton 10 bolt?))
67.5 WMS-WMS
That's 33.250 in. for the shafts + 1" pin
Rear is 68 1/2 WMS to WMS on GMT800 trucks.
Some guys say to find a semi float 14 bolt from a 2wd 2500 to get the right width for my half ton (those are getting harder to find in a local salvage yard and non disc brake). If my numbers are correct the GMT800 being 1.5 inches wider wouldn't be much of a issue since the stagger would be ok.
Then 6 lug conversion: some guys say bolt a 99-06 6 lug wheel up and roll, some say they have to use spacers? I'm not trying to reinvent the wheel here! I know guys on this forum have been there and done this, just looking for some cliff notes! Thanks guys
The 1" thick 5 lug rotors on 88-91 are for regular cab C1500's that are not equipped with heavy duty brakes. If they were extended cab they'd come with 1.25". From 92-up all C1500's got the 1.25" rotors regardless of regular/extended cab.
Now on to the 2500 6-lug (7200lb GVWR) trucks; regardless of year, if it's a 2500 6-lug it's got the 1.25" rotors. Those trucks came with HD brakes either way because of the rest of the equipment package to achieve the 7200lb GVWR. Look 'em up... RPO C5Z = 7200lb GVWR which is what a 6-lug 2500 is by design.
SO...if you're converting an 88-91 REGULAR cab C1500 that did not come with HD brakes (and typically they did not), to use 2500 6-lug rotors, you gotta change spindles too.
Richard
The rear end is where I am STUCK! Like I said I have a 3:42 disc brake rear (swapped out to the 3:42 from 2:08's couple years ago with the disc brake conversion, Impala ss based setup from several years back) Why can't I use a 99-2006 GMT800 rear that already has disc brakes and "maybe" a G80. Seems the 99-06 lots of them had G80's. I have SEARCHED and searched the ol interweb's and found:
The GMT 400 style 14 bolt 9.5 from 88-98 6 lug is. (same as 1/2 ton 10 bolt?))
67.5 WMS-WMS
That's 33.250 in. for the shafts + 1" pin
Rear is 68 1/2 WMS to WMS on GMT800 trucks.
Some guys say to find a semi float 14 bolt from a 2wd 2500 to get the right width for my half ton (those are getting harder to find in a local salvage yard and non disc brake). If my numbers are correct the GMT800 being 1.5 inches wider wouldn't be much of a issue since the stagger would be ok.
Then 6 lug conversion: some guys say bolt a 99-06 6 lug wheel up and roll, some say they have to use spacers? I'm not trying to reinvent the wheel here! I know guys on this forum have been there and done this, just looking for some cliff notes! Thanks guys