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Rear End Jacking Question
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Rear End Jacking Question

    Created by: emcguy
Orig. Posting Date User Name Edit Date Msg No.
May-12-2008 05:28AM Dan Moffet   839417
May-11-2008 02:50PM emcguy   839328
May-10-2008 07:31PM Hunter2   839219
May-10-2008 04:03PM Cheleker   839191
May-10-2008 01:48PM kerr   839164
May-10-2008 11:50AM emcguy   839154

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 Posted: May-12-2008 05:28AM
Dan Moffet
Total Posts: 2446
Last Post: 12-01-08
Member Since: 08-14-02

 
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I have a steel angle bolted to the rear cross-rail of my car's rear subframe. This piece of angle is from an old bed-frame, so is stronger than mild steel (especially when I tried to drill it). At one point, I needed a vertical surface to bolt a central exhaust hanger to, so bolted a long piece with the vertical flange up inside the subframe. The angle is long enough to dupicate Cheleker's 2x4 but is secured to the subframe so it is very sturdy and stable.

 

"Hang on a minute lads....I've got a great idea."

 Posted: May-11-2008 02:50PM
emcguy
Total Posts: 86
Last Post: 12-03-08
Member Since: 10-13-06

 
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OK - here is a follow-up report.  First, I want to thank everyone for the helpful suggestions and comments.  I built a jig as per Norm's instructions, and did considerable trimming to clear the exhaust and valence pan edges.  When starting the lift, it took me a few tries to be sure that I had the block positioned properly.  As I began jacking, I saw firsthand how unstable this setup was, just as Norm had cautioned.  The stack of 2x4's definitely has a tendency to roll, and even though I had chocked the front wheels with 2x4's, they worked loose and there was considerable movement.  I was also worried about pinching the exhaust and valence pan, as the clearances were rather tight.  (This is one of those things that you understand much better when you see it happen firsthand.)

Although I'm sure that practice would help, I really don't think that this method is as clean and foolproof as the Dooder block is on the front.  For me personally, the convenience of lifting both sides of the rear at once is just not worth the risk of a serious accident.   I will be going back to jacking one side at a time, using of the main beams.

Thanks Again - I consider myself fortunate to have learned a valuable lesson in safety without actually suffering the consequences!

1981 Mini, 998cc , Stage 1, 12G295 Modified Head

 Posted: May-10-2008 07:31PM
Hunter2
Total Posts: 2070
Last Post: 12-03-08
Member Since: 11-02-06

 
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Careful is the order of the day.  After losing a lift off the rear subbie crossmember (Minis fall faster than jacks) I went back to the tried and true lifts off the main webs of the rear subframe.

Mini friends!  Mini rides!

Restored/modified Mini 1000 with 1380cc power unit, 2.95:1 FD, adj. suspension, S discs/drums, 10x5 Minilites, 165x70 A008s, custom trim and matching custom trailer.

Minilite3.jpg

 Posted: May-10-2008 04:03PM
Cheleker
Total Posts: 7743
Last Post: 12-03-08
Member Since: 12-03-02

 
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If you have a proper side exit exhaust, just use a single 2x4 about two feet long and jack under the rear cross member. The rear member is more than strong enough as long as you spread the load out well. It will collapse easily, if you don't.

 Posted: May-10-2008 01:48PM
kerr
Total Posts: 
Last Post: 12-03-08
Member Since: 03-13-00

 
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yup

just nail a stack of 3 2x4s together, and then notch out where the exhaust is. Add a 2x4x4 square to each end for applying your lift right at the rear, outboard corners of the rear subframe (very solid right there, where the rear bushings are fastened).

After a bit of cutting to fit, bob's your uncle. You may have to notch a bit to avoid hanging up on the rear valence panel.

Just keep this in mind: it is NOT real stable in the fore/aft direction, jacking something up with a tall block like this (about 6 1/2" tall, overall), on top of your floor jack lifting point. Be sure to have the front wheels securely blocked before jacking this setup very high off the ground.

Oh, and if your floor jack is too tall to fit this under, try removing the swivel piece from your jack for an extra inch or so.

Jack safely, and use jack stands before getting underneath.

Norm

 Posted: May-10-2008 11:50AM
emcguy
Total Posts: 86
Last Post: 12-03-08
Member Since: 10-13-06

 
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I just got one of the famous (dooderopolis) jack blocks for the front subframe and couldn't be more pleased with it.  I was wondering if anybody has worked out a similar scheme for jacking the rear in one lift?  The biggest obstruction in my case is my muffler.  The rear lip of the subframe (just in front of the rear bumper) would seem like a good location for a similar block, but I am not sure if that part of the frame is strong enough to carry the load.  Has anybody done this?

Thanks!

1981 Mini, 998cc , Stage 1, 12G295 Modified Head

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