69 rear lifts when in reverse??

maloneduke · Posted: Tue Nov 25, 2014 2:49 pm Post subject: 69 rear lifts when in reverse??

i have a 69 sedan now with a swingaxle rear end... when i back up in reverse the rear end raises about two inches, then when i drive forward it goes back to normal... any ideas???

Stuart Maingot · Posted: Tue Nov 25, 2014 3:04 pm Post subject:

Rear Brake shoes may be engaging.

maloneduke · Posted: Tue Nov 25, 2014 3:11 pm Post subject:

ok, plan to rebuild the brake system in january so ill know then if that works... thanks...

maloneduke · Posted: Tue Nov 25, 2014 3:12 pm Post subject:

although when in reverse i feel no resistance, ???

Stuart Maingot · Posted: Tue Nov 25, 2014 3:23 pm Post subject:

Any resistance to the wheels turning will result in the swingaxle squatting in foward motion and jacking in reverse motion. You can check this by engaging the handbrake. If u determine brakes are not the problem it may be wheel bearings of a internal differential problem maybe. I am no expert past the side covers on swingaxles. Sure u will get some more ideas from others.

[email protected] · Posted: Tue Nov 25, 2014 3:42 pm Post subject:

Your rear toe is wrong; have the rear aligned.
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modok · Posted: Tue Nov 25, 2014 5:48 pm Post subject:

Yeah, probably toed out too much. Some is normal, but 2 inches sounds like too much!!

Rex lucy · Posted: Tue Nov 25, 2014 9:22 pm Post subject:

wow, check to make sure all the bolts are in trans front mount.

Bruce · Posted: Tue Nov 25, 2014 9:48 pm Post subject:

Aussiebug · Posted: Tue Nov 25, 2014 11:03 pm Post subject:

And the correct rear alignment is....

0.5 degrees or about 2mm at the rim toe OUT. You use the elongated holes in the spring plates to set this.

Save the toe IN for the front wheels (4mm for cross ply tyres and 2mm for radial tyres.)

Just an aside here - the orange Bentley (1970-79) has a mistake here, it recommends 1 degree (+20' -40') for strut front suspensions and 30 degrees (+or- 15') for the torsion bar front suspension - oops![/b]
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bnam · Posted: Wed Nov 26, 2014 1:39 am Post subject:

It's hard for me to believe that a couple of degrees of wrong toe (one way or another) could cause a 2" lift in reverse. Let us know what the cause was.

Stuart Maingot · Posted: Wed Nov 26, 2014 6:52 am Post subject:

At first glance it seems hard to believe but after reading some info on this the wrong toe setting, even a few degrees, increases the rolling resistance of the wheel and jacks the suspension in reverse in this case. Live and learn.

Q-Dog · Posted: Wed Nov 26, 2014 6:57 am Post subject:

If you want to test this, back the car on loose gravel and see if the rear still lifts up.
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[email protected] · Posted: Wed Nov 26, 2014 11:37 am Post subject:

if the rear is toed out, when you back it up each rear tire wants to walk toward the center of the car, jacking the rear up high.

It also means the car is wearing out tires at a rapid clip, and you are losing several MPG leaving rubber on the road as you drive with tire scrub.
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maloneduke · Posted: Wed Nov 26, 2014 12:19 pm Post subject:

thanks guys, ill have it checked... i need to have the torsion bars readjusted so looks like ill be doing everything at once, also myn tires are wearing fine, and mpg is great... soooo who knows... hopefully it doesnt hurt me till jan when i can take it to someone...

68IHscout · Posted: Wed Nov 26, 2014 1:19 pm Post subject:

Its probably not relevant but is it a autostick?

maloneduke · Posted: Wed Nov 26, 2014 1:46 pm Post subject:

NO STANDARD, ITS A WEIRD ONE, ITS A CROSS BETWEEN A 68,69, AND 70... I GUESS ONLY SOLD IN A FEW COUNTRIES... MY SPEEDO IS IN KILO'S. SO I GOT ALL KINDS OF STUFF I GOTTA FIGURE OUT... LIKE WHY THE HALF MOON VENTS BEHIND MY QUARTER WINDOWS ARE PUNCHED BUT NOT CUT THRU. NO VENT. 69'S ARE SMOOTH AND 70'S ARE WITH THE VENT CUT OUT WITH THE PLASTIC INSTALLED. I HAVENT FOUND A PICTURE OR ANYTHING TO SOLVE....

GArBa · Posted: Wed Nov 26, 2014 1:55 pm Post subject:

sounds just like a euro-spec standard (base) model. they didn't come with IRS or flow-through ventilation.
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maloneduke · Posted: Wed Nov 26, 2014 2:19 pm Post subject:

ok, so that makes sense now... any suggestions on which wiring diagram i should use? its got components for 69, but the fuse box is from a 70... and nothing seems to match up with either so i know its been messed with quite a bit...

Aussiebug · Posted: Wed Nov 26, 2014 5:51 pm Post subject:


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