rockjeep73

I sheared the bolts and straps off the dana 70 yoke twice and I busted all the spider gears in the carrier, all while sled pulling. My brother has sheared two pinion gears sled pulling. If your gonna be pulling then go with the 80.

haloman

A buddy broke the r/p in his D70 in his 01' while doing a small burnout at only around 300hp.

allisfarmer

switch it to an d80 and you can rest at ease cause unless your really beating on a d80 they pretty tough i broke a d70 pinion pulling and i wasn't even bouncing or anything ive heard of them braking just screwing around on the street

Redliner

My customer blew spiders out of his "just driving down the road" trans also blew at same time. All but one blew out. Broke the ring gear in 2.

GLHS

I broke it in my 1st gen but, it's a manual tranny............autos are a bit easier on them.
I think Jimmy Smiths truck still runs a 70.
Are all Dana 80's 35 spline?
What's it take to convert to 37 spline axles?
What are the spline count for Dana 70's?
Are they different for some years?

Stamey

Broke the left axle my D70 in my 99 sled pulling, but I had a spare. Wheel hop. Still had to pull the LS apart to drive out the broken stub that was in it. Added ladder bars. After it was all back together I went sled pulling again and EXPLODED the spider gears in the LS. Got a complete kit to rebuild the LS from Randy's (everything but the case). Since then I have a little wine around 40mph, and up. Figure the pinion bearing got some trash in it. LS still tight as a drum though.
I will upgrade to an AAM at some point, just bypassing the D80 altogether because I hear the AAM is stronger.

Chris

rockjeep73

I believe all dodge dana 80's are 35 spline, and the 37 spline ones came in some fords. You can convert it to 37 spline with the shafts and carrier. Might even be able to just swap the spider gears over, or get a 37 spline locker of some sort. 2nd gen dana 70's are 32 spline, the earlier 1st gen ones are 35 spline, not sure what year they switched though.

rockjeep73

I have heard the opposite, plus there is much more aftermarket and gear selection for the 80

JD730

Friend of mine broke teeth off the pinion on his 92. He asked me what to do, I told him to go find another rear. For what he spent in parts (over $1100 for new ring and pinion, bearings and a new LS carrier, still has 32 spline axles) he could have bought a good dana 80 with a LS in it.


35 spline in a 1st gen? I've never been into anything earlier than a 92 and they all had 32 spline axles. I have 2 89's, a 90 and a 91, but I don't have the ambition to pull axles out and count them right now, too cold out.

GLHS

That's exactly what it cost me!

rockjeep73

the dana 71 in my 89 is 35 spline

kipo

I broke my d D80 with just the Superchips and exhaust one night. Decided I was going to climb a small wet hill in 2wd, slid back and hit the pavement while spinning about 18k. I don't think it should have broke but all the spider gears shattered. Put a junk yard unit in and all is fine....................so far??

pulltilbroke

the 70 in my 90 was 35 spline
I thought the 80 was either 37 0r 40 spline??????

jakeydiesel

does the 70 unit in '01 only have 2 spider gears whereas the the 80 has four? im on my third 80 rearend, spider gears have exploded in both previous units...

rockjeep73

the 80 is either 35 or 37 spline