D80 vs GM14 bolt

[stuckey_272002]

there were 2 old studebakers that pulled in the ostpa smfwd class they both ran 14 bolt rear axles. im not saying it will work in a ss but in a 2.6 truck there is no reason it will not work.

 

[Cummins Driver]

It sure seems to me like the 3rd pinion bearing would make all the difference in the gears holding up in an axle. Seems like it would eliminate almost all flex.

Eric

 

[brushpuller]

It sure seems to me like the 3rd pinion bearing would make all the difference in the gears holding up in an axle. Seems like it would eliminate almost all flex.

Eric

It don't!!! The housing flexes (where the axle tubes are spot welded in) when under high HP and a truck that HOOKS!
IMO comparing a 14 bolt to a d-80 is like comparing a d-80 to a 1/2 ton rearend!
With that said, a 14 bolt mite hold on crappy tracks! But around here with a lot of clay and good biting tracks it just didn't hold up! Iv broke MANY ring and pinion's tryn to get the 14 bolt to hold.

 

[Sonic_Superduty]

there were 2 old studebakers that pulled in the ostpa smfwd class they both ran 14 bolt rear axles. im not saying it will work in a ss but in a 2.6 truck there is no reason it will not work.

im with you 100% on this! I just happen to know of 3 smfwd trucks that run them with out any problem, 14 bolt with planetaries scs axels and yes cut tires. and when they are putting out around 18-2200hp reguardless of the torque which I would probaly guess it to be around 13-1500 ftlbs. I think it will hold up just fine in my little 2.6er.......but we are just goofy ohioans that dont know a thing!!:bang

 

[zstroken]

Planetaries? I think that will take a load off of the ring and pinion wouldn't it?

 

[Tad]

Planetaries take all the stress away. Art Arfons ran a Dana 60 rear in his Turbine tractor with plane tarries and never broke.

The 14 bolt is ok but in our area they break in gas trucks so the torque of a diesel will snap one faster but then again the high n/a hp gas trucks are breaking 80's with all the aftermarket parts in them too.

 

[brushpuller]

Planetaries will make a hero out of a toyota axle! :woohoo::hehe:

 

[bh10]

some 88-00 1 ton chevy's both single and duallies used the dana 80 and almost all 73-87 3/4 ton and 73-89 1 tons both single and duallie used the 14 bolt ff some duallies used the dana 70 but i dont think it was very many. the dodge is the best source to find a dana 80

I think you have that backwards most chevy dually's and box trucks came with a d70 or 14bolt, the d80 is extremely rare.

It don't!!! The housing flexes (where the axle tubes are spot welded in) when under high HP and a truck that HOOKS!
IMO comparing a 14 bolt to a d-80 is like comparing a d-80 to a 1/2 ton rearend!
With that said, a 14 bolt mite hold on crappy tracks! But around here with a lot of clay and good biting tracks it just didn't hold up! Iv broke MANY ring and pinion's tryn to get the 14 bolt to hold.

Thats the weakest point of the 14bolt is the axle tubes, they do like to twist under extreme loads, you NEED to weld the to the housing for any pulling, IMO. Also another issue with is a good option are axle trusses innergrated (sp?) w/ the diff cover, these two mods will make the 14bolt live much longer.

Id like to know how you were breaking ring and pinions? Did you set the gears up, what diff did you start with a open or gov lock? I just find it hard to believe you where breaking r&p, easy on a 14bolt, those are the last things on those that should go.

Planetaries? I think that will take a load off of the ring and pinion wouldn't it?

Like you wouldnt believe, like said they'll make just about any axle look good in the strength department. Id even say through a 9" w/ some high 2.xx gears a 40 spline shafts with some planetaries, and they hold up better than a built d80, youll bend the axle housing before breaking internal parts.

 

[stillsmokin]

This is what I ended stuffing under my 92 to get rid of the 70U. It's the 14 bolts predecessor. It was a better fit to the early truck width wise.

After a few runs it's holding fine, long term well see. If it don't work out I have it's bigger brother in reserve, looks similar, 12.25" ring gear.

No center section to spin out, 1/2" formed steel housing, 3 pinion bearings, load deflection bolt on the backside of the ring gear, larger pinion shaft than an 80 or 14 bolt. I elected to use this due to the crush sleeve in the 14 bolt.

It has a mini spool from a 14 bolt and 14 bolt 30 spline axle shafts. I upgraded to modern tapered roller bearings and 5/8 wheel studs. Total cost $500. I couldn't get 4.56's for the 80.

 

[RyanB]

I have seen a bunch of these but don't know its name???? Whats the shaft size and spline count?

Ryan

 

[stillsmokin]

The axle is a GM 7200#, more commonly called an HO72 or GM/Eaton

Mine is a Hybrid, 1.5" 30 spline axles (not the same as 30 spline dana). The pinion is 2".

 

[zstroken]

This is what I ended stuffing under my 92 to get rid of the 70U. It's the 14 bolts predecessor. It was a better fit to the early truck width wise.

After a few runs it's holding fine, long term well see. If it don't work out I have it's bigger brother in reserve, looks similar, 12.25" ring gear.

No center section to spin out, 1/2" formed steel housing, 3 pinion bearings, load deflection bolt on the backside of the ring gear, larger pinion shaft than an 80 or 14 bolt. I elected to use this due to the crush sleeve in the 14 bolt.

It has a mini spool from a 14 bolt and 14 bolt 30 spline axle shafts. I upgraded to modern tapered roller bearings and 5/8 wheel studs. Total cost $500. I couldn't get 4.56's for the 80.

Gear selection can be an issue with these, but if that is what I am think, I have heard that the pinon/ring gear is a very good setup. The tubes look kind of disappointing though.

 

[bh10]

The axle is a GM 7200#, more commonly called an HO72 or GM/Eaton

Mine is a Hybrid, 1.5" 30 spline axles (not the same as 30 spline dana). The pinion is 2".

Yep, but stock they come w/ 17 spline axle shafts and either 4.57 or 4.10 (maybe its 4.09) gears, with are stout but the 14bolt axles and locker are a better upgrade. The Eaton is one slick setup. :rockwoot:

 

[SmokeShow]

What did those HO72 come in? Assuming something greater than a 1-ton application?

 

[stuckey_272002]

67-71 1 ton chevy and gmc. for sure maby others.

 

[brushpuller]

What did those HO72 come in? Assuming something greater than a 1-ton application?

You can find them easiest in 3/4 and 1 ton late 60's to 72 chevy trucks,vans,box trucks... They quit making them in 1972. I used this rear end for years, and they are VERY STRONG!!!! The gears most comin in thies is 4:10, 4:88, 5:13 and some 3:73's. Also you can score a factory detroit locked in some! With an axle shaft upgrarde this axle is as strong as a d-80 but at a 1/3 the cost!

 

[malibu795]

You can find them easiest in 3/4 and 1 ton late 60's to 72 chevy trucks,vans,box trucks... They quit making them in 1972. I used this rear end for years, and they are VERY STRONG!!!! The gears most comin in thies is 4:10, 4:88, 5:13 and some 3:73's. Also you can score a factory detroit locked in some! With an axle shaft upgrarde this axle is as strong as a d-80 but at a 1/3 the cost!

got one in the back of my 59 apache 3800 panel van... with 5.13 gears

 

[Sledpuller]

Planetaries? I think that will take a load off of the ring and pinion wouldn't it?

Planetaries take all the stress away. Art Arfons ran a Dana 60 rear in his Turbine tractor with plane tarries and never broke.

The 14 bolt is ok but in our area they break in gas trucks so the torque of a diesel will snap one faster but then again the high n/a hp gas trucks are breaking 80's with all the aftermarket parts in them too.

Planetaries will make a hero out of a toyota axle! :woohoo::hehe:

Like you wouldnt believe, like said they'll make just about any axle look good in the strength department. Id even say through a 9" w/ some high 2.xx gears a 40 spline shafts with some planetaries, and they hold up better than a built d80, youll bend the axle housing before breaking internal parts.

So,............ I guess these guys dont know nuthin neither?Silly NON-Ohions......:kick::kick:
:clap:LOL

 

[PTPULLINCHASSIS]

This is what I ended stuffing under my 92 to get rid of the 70U. It's the 14 bolts predecessor. It was a better fit to the early truck width wise.

After a few runs it's holding fine, long term well see. If it don't work out I have it's bigger brother in reserve, looks similar, 12.25" ring gear.

No center section to spin out, 1/2" formed steel housing, 3 pinion bearings, load deflection bolt on the backside of the ring gear, larger pinion shaft than an 80 or 14 bolt. I elected to use this due to the crush sleeve in the 14 bolt.

It has a mini spool from a 14 bolt and 14 bolt 30 spline axle shafts. I upgraded to modern tapered roller bearings and 5/8 wheel studs. Total cost $500. I couldn't get 4.56's for the 80.

4.63'S are common and would work fine.

 

[KTA-Cummins]

I have never seen a 14bff 10.5 break unless someone had the axles bound w/ 44 or biggers tires they are tuff

But the d80 is stronger and those 37spline axles are nothing anymore when you can get 1 3/4 diameter 41 spline shafts

The bearing mounts on a dana 80 carrier are only 2.25", don't you think boring that out to accept a 1.75" axle is making it kind of thin, at least on a cast carrier like the dana or a detroit? I know in the past pulling we have sheared the ring gear side mount off of both dana and detroit carriers there with stock dimensions. I would think boring it out would just make the problem worse and that is using stock 1.62" 37 spline axles, the carrier failed first.