rear spring u-bolts

[dartkid69]

Evening.....Is there a torque value for the u-bolt/nuts used on a 1969 Dart 340 auto? Also the nuts are they grade 5 or 8 or ? Any help would be appreciated, thanks.....Ric

 

[Dana67Dart]

Mancini racing has many

The u bolts have a flat on the U end of the bolt, and the nuts are self locking.

The torque spec will be in the Factory Service Manual. IIRC it is like 45 lbs.

Too much and/or the wrong U bolts WILL crush the axle tube.

I am assuming 8 3/4"

Dana 60 and 7 1/4 are different tech

 

[dartkid69]

Mancini racing has many


View attachment 1715855739

The u bolts have a flat on the U end of the bolt, and the nuts are self locking.

The torque spec will be in the Factory Service Manual. IIRC it is like 45 lbs.

Too much and/or the wrong U bolts WILL crush the axle tube.

I am assuming 8 3/4"

Dana 60 and 7 1/4 are different tech

Morning....Thank you for the response, yes it is an 8 3/4, I did get a new set of bolts already, wanted to make sure I use the correct torque and did not realize too much would crush the axle tube....Thanks

 

[Dana67Dart]

wanted to make sure I use the correct torque and did not realize too much would crush the axle tube....Thanks

I have a housing I bought from only seeing photos and the tube is crushed at two u bolt locations. It even says so in the FSM.

GO TO mymopar.com and download a PDF service manual. It's free

 

[Mopar Momzee]

45 ft pounds

 

[Dana67Dart]

The torque spec will be in the Factory Service Manual. IIRC it is like 45 lbs.

I hate it when I remember something out of the blue for no good reason!

Thanks for the confirmation!

 

[dartkid69]

I hate it when I remember something out of the blue for no good reason!

Thanks for the confirmation!

Thanks for the confirmation and yes Dana67Dart you were spot on, so 45 ft lbs it is.

 

[Rob R]

45 lbs no way!!... 1/2 in fine thread u bolts I would start with 75 lbs,drive the car re torq to 85lbs.Then recheck after a week and and torq to 90 lbs...
Some of those 4x4 1/2" U bolts require 125 - 150lbs

 

[Dana67Dart]

45 lbs no way!!... 1/2 in fine thread u bolts I would start with 75 lbs,drive the car re torq to 85lbs.Then recheck after a week and and torq to 90 lbs...
Some of those 4x4 1/2" U bolts require 125 - 150lbs

You WILL crush the housing tube.

That's not warn it is crushed. You can see the crush on the inside of the tube.

Remember that 8 3/4 are formed flat stock metal to make the tube NOT extruded pipe

 

[Rob R]

I guess I'm thinking 3" 150 wall round tube Dana...For me if it was my 340 A body I would start at 50lb and check it weekly for the first month with the new hardware installed...