coil spring rear axle swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

292farmer · 10-13-2010, 07:49 PM

was thinking of putting a GM CORP14bolt axle in rear of my truck which is coil spring, has anyone does this? the reason im asking is how do i mount the panard bar?
also is their a special mount plate between trailing arm and axle? i don't see one. i posted a pic so if anyone sees anything that may complicate the swap.
thanks in advance!

Burb · 10-13-2010, 08:00 PM

well yes I have ... and added some other options as well.

You can use a stock style panhard bar bracket that ext off the rear tube ... you will just need to have some welding done on the axle tubes, as you may still be able to see in the pics , the bad cut piece, and the other mounts to the factory location on the frame. I had to cut mine to add a new pre-bent CPP panhard bar because of my Super Mag-Hytech diff cover. But I have to tell ya I really like this full floater on this truck.

Sorry I don't have any pics prior to the latest change.

292farmer · 10-13-2010, 08:03 PM

sweet that was fast! that's exactly what i needed to see! i was thinking of creating a new mount by welding in some 3/8" steel my dad has or should i go thicker? also did u need axle tube mounts for the trailing arms? it looks like in your pic just a flat piece of steel between axle tube and arm

Burb · 10-14-2010, 01:27 PM

No I picked up some tube saddles online some where and had them put on with the panhard bar bracket, and that was made from 4 pieces of flat steel we had layin around, and forming the bolt point for the bushing

And if you make one, make sure you measure the distance away from the tube that will be needed to clear your diff cover through both up and down travels.

How far are you going with the rear end just a outright swap or upgrading at the same time, gears, brakes, etc. ?

292farmer · 10-15-2010, 02:28 PM

pretty much just an outright swap, ive got 5.13's right now and the 14 bolt is 4.10. bet i can get better speed and mpg outa the 4.10s

and i have to do new rear brakes anyways so figured while at it i might as well swap to a higher geared axle while at it plus this GM14 has a locker.

Burb · 10-15-2010, 03:44 PM

Good stuff ... well good luck in the swap.

oldblue1968chevy · 10-15-2010, 05:24 PM

DANG! How man rpms ya turn on the interstates!!!!!!!! lol You could pull my houes down, literally!

292farmer · 10-15-2010, 07:29 PM

about 2700rpm@50mph and 3200+rpms@60 i really never go above 50 as i don't like stressing my wallet(mpgs) and the motor 292I6 aren't really hi rpm motors ive hauled over 2800lbs in the bed and towed about 6000lbs(bobcat tractor w/trailer) while carrying 1500lbs of cinder blocks, i got a weight receipt somewhere i got pulled over by a statie cop think i was with trailer about 11700lbs 11734 exact i believe its how the trucks gotten its name "the beast". i almost don't want to do the axle swap cause i love the truck as is but....i need some highway ability

lb

292farmer · 12-31-2010, 10:46 AM

alrighty i know it been a while ive been busy with 2 jobs getting a new house for our new arrival

but finally got the 14 bolt off my uncle for free! i may buy a panhard bar, but might make one so my question is, which is better a longer or shorter panhard bar? i'd imagine a longer one would provide better leverage and smoother action, but maybe shorter is best? i'll be moving the mounts in either case to ensure proper rear end location no matter bar length. also is that a fully floating axle? im used to the big hubs sticking out its out of a 87 1 ton so i'd imagine its full floater.
thanks guys

LostMy65 · 01-19-2011, 11:25 PM

How's this project going?

into69z · 01-20-2011, 12:49 AM

Quote:

Originally Posted by 292farmer

alrighty i know it been a while ive been busy with 2 jobs getting a new house for our new arrival

but finally got the 14 bolt off my uncle for free! i may buy a panhard bar, but might make one so my question is, which is better a longer or shorter panhard bar? i'd imagine a longer one would provide better leverage and smoother action, but maybe shorter is best? i'll be moving the mounts in either case to ensure proper rear end location no matter bar length. also is that a fully floating axle? im used to the big hubs sticking out its out of a 87 1 ton so i'd imagine its full floater.
thanks guys

I put the same rearend in my truck. it has a 3:23 gear ratio. I used ccp mounts and adjustable panhard bar-they have a kit for around $125 I think

292farmer · 01-20-2011, 11:31 AM

unfortunately weather below 0 and an accident that has left me with a 12hr blackout has really slowed me down. the good part is the wife hates the dodge ive been driving and really misses my GMC she keeps asking when its gonna be done

. im just kinda taking it easy now ive got a cat scan tues hopefully that eases my mind.

10-13-2010, 07:49 PM	#1
292farmer Registered User Join Date: Nov 2009 Location: stoddard nh Posts: 693	coil spring rear axle swap was thinking of putting a GM CORP14bolt axle in rear of my truck which is coil spring, has anyone does this? the reason im asking is how do i mount the panard bar? also is their a special mount plate between trailing arm and axle? i don't see one. i posted a pic so if anyone sees anything that may complicate the swap. thanks in advance! Attached Images __________________ 1972 gmc c25 292/sm465 dana 60 w/5.13s 1973 vw super beetle 1600cc/4spd(baja bug) 1974 chevy c60 351v6/np-540+2 speed eaton rear 2005 chevy cobalt 2.2l

10-13-2010, 08:00 PM	#2
Burb Coordinator of Synchronicity Join Date: Dec 2005 Location: West of Houston, TX Posts: 437	Re: coil spring rear axle swap well yes I have ... and added some other options as well. You can use a stock style panhard bar bracket that ext off the rear tube ... you will just need to have some welding done on the axle tubes, as you may still be able to see in the pics , the bad cut piece, and the other mounts to the factory location on the frame. I had to cut mine to add a new pre-bent CPP panhard bar because of my Super Mag-Hytech diff cover. But I have to tell ya I really like this full floater on this truck. Sorry I don't have any pics prior to the latest change. Attached Images __________________ Rick 1971 Suburban ... W.I.P. *Build Thread* Customization is ones personal touch-- not what other people think it should be Last edited by Burb; 10-13-2010 at 08:06 PM.

10-13-2010, 08:03 PM	#3
292farmer Registered User Join Date: Nov 2009 Location: stoddard nh Posts: 693	Re: coil spring rear axle swap sweet that was fast! that's exactly what i needed to see! i was thinking of creating a new mount by welding in some 3/8" steel my dad has or should i go thicker? also did u need axle tube mounts for the trailing arms? it looks like in your pic just a flat piece of steel between axle tube and arm __________________ 1972 gmc c25 292/sm465 dana 60 w/5.13s 1973 vw super beetle 1600cc/4spd(baja bug) 1974 chevy c60 351v6/np-540+2 speed eaton rear 2005 chevy cobalt 2.2l Last edited by 292farmer; 10-13-2010 at 08:05 PM.

10-14-2010, 01:27 PM	#4
Burb Coordinator of Synchronicity Join Date: Dec 2005 Location: West of Houston, TX Posts: 437	Re: coil spring rear axle swap No I picked up some tube saddles online some where and had them put on with the panhard bar bracket, and that was made from 4 pieces of flat steel we had layin around, and forming the bolt point for the bushing And if you make one, make sure you measure the distance away from the tube that will be needed to clear your diff cover through both up and down travels. How far are you going with the rear end just a outright swap or upgrading at the same time, gears, brakes, etc. ? __________________ Rick 1971 Suburban ... W.I.P. *Build Thread* Customization is ones personal touch-- not what other people think it should be Last edited by Burb; 10-14-2010 at 02:32 PM.

10-15-2010, 02:28 PM	#5
292farmer Registered User Join Date: Nov 2009 Location: stoddard nh Posts: 693	Re: coil spring rear axle swap pretty much just an outright swap, ive got 5.13's right now and the 14 bolt is 4.10. bet i can get better speed and mpg outa the 4.10s and i have to do new rear brakes anyways so figured while at it i might as well swap to a higher geared axle while at it plus this GM14 has a locker. __________________ 1972 gmc c25 292/sm465 dana 60 w/5.13s 1973 vw super beetle 1600cc/4spd(baja bug) 1974 chevy c60 351v6/np-540+2 speed eaton rear 2005 chevy cobalt 2.2l

10-15-2010, 03:44 PM	#6
Burb Coordinator of Synchronicity Join Date: Dec 2005 Location: West of Houston, TX Posts: 437	Re: coil spring rear axle swap Good stuff ... well good luck in the swap. __________________ Rick 1971 Suburban ... W.I.P. *Build Thread* Customization is ones personal touch-- not what other people think it should be

10-15-2010, 05:24 PM	#7
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: coil spring rear axle swap DANG! How man rpms ya turn on the interstates!!!!!!!! lol You could pull my houes down, literally! __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

10-15-2010, 07:29 PM	#8
292farmer Registered User Join Date: Nov 2009 Location: stoddard nh Posts: 693	Re: coil spring rear axle swap about 2700rpm@50mph and 3200+rpms@60 i really never go above 50 as i don't like stressing my wallet(mpgs) and the motor 292I6 aren't really hi rpm motors ive hauled over 2800lbs in the bed and towed about 6000lbs(bobcat tractor w/trailer) while carrying 1500lbs of cinder blocks, i got a weight receipt somewhere i got pulled over by a statie cop think i was with trailer about 11700lbs 11734 exact i believe its how the trucks gotten its name "the beast". i almost don't want to do the axle swap cause i love the truck as is but....i need some highway abilitylb __________________ 1972 gmc c25 292/sm465 dana 60 w/5.13s 1973 vw super beetle 1600cc/4spd(baja bug) 1974 chevy c60 351v6/np-540+2 speed eaton rear 2005 chevy cobalt 2.2l Last edited by 292farmer; 10-15-2010 at 07:32 PM.

12-31-2010, 10:46 AM	#9
292farmer Registered User Join Date: Nov 2009 Location: stoddard nh Posts: 693	Re: coil spring rear axle swap alrighty i know it been a while ive been busy with 2 jobs getting a new house for our new arrival but finally got the 14 bolt off my uncle for free! i may buy a panhard bar, but might make one so my question is, which is better a longer or shorter panhard bar? i'd imagine a longer one would provide better leverage and smoother action, but maybe shorter is best? i'll be moving the mounts in either case to ensure proper rear end location no matter bar length. also is that a fully floating axle? im used to the big hubs sticking out its out of a 87 1 ton so i'd imagine its full floater. thanks guys Attached Images __________________ 1972 gmc c25 292/sm465 dana 60 w/5.13s 1973 vw super beetle 1600cc/4spd(baja bug) 1974 chevy c60 351v6/np-540+2 speed eaton rear 2005 chevy cobalt 2.2l Last edited by 292farmer; 12-31-2010 at 10:48 AM.

01-19-2011, 11:25 PM	#10
LostMy65 But Found Her 25yrs Later! Join Date: Oct 2010 Location: Oregon City, Oregon Posts: 10,530	Re: coil spring rear axle swap How's this project going? __________________ I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035

01-20-2011, 11:31 AM	#12
292farmer Registered User Join Date: Nov 2009 Location: stoddard nh Posts: 693	Re: coil spring rear axle swap unfortunately weather below 0 and an accident that has left me with a 12hr blackout has really slowed me down. the good part is the wife hates the dodge ive been driving and really misses my GMC she keeps asking when its gonna be done. im just kinda taking it easy now ive got a cat scan tues hopefully that eases my mind. __________________ 1972 gmc c25 292/sm465 dana 60 w/5.13s 1973 vw super beetle 1600cc/4spd(baja bug) 1974 chevy c60 351v6/np-540+2 speed eaton rear 2005 chevy cobalt 2.2l



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