HomeForumsTechnical – GeneralDrivelineVR/S Rear Sub Frame Stengthening

This topic contains 14 replies, has 5 voices, and was last updated by Profile photo of VRSenator065 VRSenator065 9 years, 7 months ago.

Viewing 15 posts - 1 through 15 (of 15 total)
  • Author
    Posts
  • #2228
    Profile photo of VRSenator065
    VRSenator065
    Participant
    • Adelaide SA
    • VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)

    • View build HERE
    Member since: February 17, 2015
    Posts: 5 777
    Supporter

    General
    The rear sub frame on a VR and VS is a well known weak spot. They are very prone to cracking even with a standard 5L. So with mine I modified and strengthened it. There are a lot of different ways to do it, but very happy with how mine turned out, so thought I would post what I did.
    I made up cardboard templates, then took it to a welder that used the templates to cut the strengthening pates. He fully welded it all, then I had it powder coated back.

    I used 6mm plate for the top of the frame where the diff mounts, and also cut in a 10mm vertical member to tie the top and bottom together. I also added doubler plates to where the suspension arms mount as they tend to flog out when pushed hard. I also triangulated it all with gussets where ever possible.

    This is how it turned out back from the powder coaters

    And this is it all assembled.

    #2253
    Profile photo of Kenthor
    Kenthor
    Participant
    Member since: March 2, 2015
    Posts: 3

    I took a different approach, when I strengthened mine we added a 40mm flat bar around the edge as a border. Figured the the issue with them cracking is when the frame flexes so made sure it couldn’t flex.

    Hoping these pics work!

    Attachments:
    You must be logged in to view attached files.
    #2260
    Profile photo of VRSenator065
    VRSenator065
    Participant
    • Adelaide SA
    • VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)

    • View build HERE
    Member since: February 17, 2015
    Posts: 5 777
    Supporter

    Cool, nice to see a different approach.

    #2268
    Profile photo of Brockfan05
    Brockfan05
    Participant
    Member since: March 7, 2015
    Posts: 39
    Supporter

    This is actually one of the areas I was curious about strengthening on both my vr and vs. Fortunately both of my irs cradles are in good shape still. Thanks for posting this up guys, very helpful. Just out of interest Gary, did you have a slot cut into the frame top and bottom for the ten mm plate that was welded in? I’m just trying to work out exactly what you’ve done there is all.

     

    • This reply was modified 9 years, 8 months ago by Profile photo of Brockfan05 Brockfan05.
    #2272
    Profile photo of VRSenator065
    VRSenator065
    Participant
    • Adelaide SA
    • VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)

    • View build HERE
    Member since: February 17, 2015
    Posts: 5 777
    Supporter

    Yea mate, I cut a lot top and bottom, dummied it up with a piece of 10mm thick timber, then replicated it in steel. The idea is is takes the torque as it loads up, works great.

    • This reply was modified 9 years, 8 months ago by Profile photo of VRSenator065 VRSenator065.
    #2278
    Profile photo of VRSenator065
    VRSenator065
    Participant
    • Adelaide SA
    • VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)

    • View build HERE
    Member since: February 17, 2015
    Posts: 5 777
    Supporter

    • This reply was modified 9 years, 8 months ago by Profile photo of VRSenator065 VRSenator065.
    #2282
    Profile photo of Kroozer
    Kroozer
    Participant
    Member since: February 19, 2015
    Posts: 336
    Supporter

    Why didn’t they make them like that out of the factory ;) hahaha

    #2286
    Profile photo of VRSenator065
    VRSenator065
    Participant
    • Adelaide SA
    • VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)

    • View build HERE
    Member since: February 17, 2015
    Posts: 5 777
    Supporter

    They probably didn’t expect us to be putting 1000rwNm through them :)

    #2344
    Profile photo of Brockfan05
    Brockfan05
    Participant
    Member since: March 7, 2015
    Posts: 39
    Supporter

    Cool, thanks Gary. Did you use a plasma cutter to get the slot that accurate? It’s so neat lol.

    #2347
    Profile photo of VRSenator065
    VRSenator065
    Participant
    • Adelaide SA
    • VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)

    • View build HERE
    Member since: February 17, 2015
    Posts: 5 777
    Supporter

    Nah mate, just very careful with a 4″ angle grinder and a 1mm cut off disc.

    #2349
    Profile photo of Kroozer
    Kroozer
    Participant
    Member since: February 19, 2015
    Posts: 336
    Supporter

    They probably didn’t expect us to be putting 1000rwNm through them :)

    Hahaha probably not hey :P

    #4426
    Profile photo of [TUFFVQ]
    [TUFFVQ]
    Participant
    Member since: March 2, 2015
    Posts: 171

    I put a 10mm plate across the top of the sub frame (like what you have done) and doublers on the trailing arm mounting bolts. Will be interested to see it’s condition after a few years on SSSL’s and a spool.

    #4429
    Profile photo of VRSenator065
    VRSenator065
    Participant
    • Adelaide SA
    • VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)

    • View build HERE
    Member since: February 17, 2015
    Posts: 5 777
    Supporter

    I can’t remember who on SC suggested the doubler plates on the trailing arm bolts, I wasn’t going to do it, but apparently they flog out. I probably went a little overboard (surprise surprise) but at least its done. What sort of power are you putting through yours?

    • This reply was modified 9 years, 7 months ago by Profile photo of VRSenator065 VRSenator065.
    #4622
    Profile photo of [TUFFVQ]
    [TUFFVQ]
    Participant
    Member since: March 2, 2015
    Posts: 171

    Nowhere near as much as you are, it’s the spool that was elongating them over time.

    #4630
    Profile photo of VRSenator065
    VRSenator065
    Participant
    • Adelaide SA
    • VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)

    • View build HERE
    Member since: February 17, 2015
    Posts: 5 777
    Supporter

    Yea right, I have a locker, not as savage as a spool but I imagine still putting it under a bit more load than a regular lsd.

Viewing 15 posts - 1 through 15 (of 15 total)

You must be logged in to reply to this topic.