Hello,
My goal is a super street-able ride that can be driven daily if need be, with the ability to go out to the track or autocross once or twice a year. Right now my plan for the rear end is to upgrade the current Detroit Locker/3.73/Leaf/Drum/14" wheels to a TrueTrac/3.55/RMS 4-link/Disc Brakes/17x8 or 9" wheels.
I've already installed an Alterktion with 13" Wilwood SL6 brakes up front. However, I bought the rear-end ~15 years ago from a classified ad. I know it's an 8.75" with a 489 case but that's about it. After researching a bit I'm now realizing that there are many variants/sizes of this rear-end and I'm not 100% sure which one I have or if it matters if I want to install an RMS 4-link with 12" Wilwood disc brakes.
Specifically I am concerned that I might need to have the rear-end narrowed in order for the bigger wheels to fit properly, or if I can just compensate with some additional backspacing. When I installed the rear-end (~15 yrs ago) I noticed it was a bit wider than the stock 7.25", although it fit my existing leaf springs and stock wheels at the time. I suspect the rear end is not from an a-body and is wider than an a-body 8.75".
My understanding is that I'll also need to get my axles machined (or order new Moser axles) for the Wilwood brake kit to fit so I want to learn as much as possible before proceeding or ordering any parts.
Should I find out exactly which rear-end variant I have and have it narrowed or can I just compensate with wheel backspacing?? If I don't shorten the rear-end will it lead to any other issues or challenges later?
I would certainly appreciate any guidance if someone is familiar with this setup.
Thanks!!
My goal is a super street-able ride that can be driven daily if need be, with the ability to go out to the track or autocross once or twice a year. Right now my plan for the rear end is to upgrade the current Detroit Locker/3.73/Leaf/Drum/14" wheels to a TrueTrac/3.55/RMS 4-link/Disc Brakes/17x8 or 9" wheels.
I've already installed an Alterktion with 13" Wilwood SL6 brakes up front. However, I bought the rear-end ~15 years ago from a classified ad. I know it's an 8.75" with a 489 case but that's about it. After researching a bit I'm now realizing that there are many variants/sizes of this rear-end and I'm not 100% sure which one I have or if it matters if I want to install an RMS 4-link with 12" Wilwood disc brakes.
Specifically I am concerned that I might need to have the rear-end narrowed in order for the bigger wheels to fit properly, or if I can just compensate with some additional backspacing. When I installed the rear-end (~15 yrs ago) I noticed it was a bit wider than the stock 7.25", although it fit my existing leaf springs and stock wheels at the time. I suspect the rear end is not from an a-body and is wider than an a-body 8.75".
My understanding is that I'll also need to get my axles machined (or order new Moser axles) for the Wilwood brake kit to fit so I want to learn as much as possible before proceeding or ordering any parts.
Should I find out exactly which rear-end variant I have and have it narrowed or can I just compensate with wheel backspacing?? If I don't shorten the rear-end will it lead to any other issues or challenges later?
I would certainly appreciate any guidance if someone is familiar with this setup.
Thanks!!