Axle Swap on Volvo D12

I had a 05 d12d and had no power how would you run hills with that motor? It's dependable but weak.

 

Mine was a 13 speed .76 overdrive. With 3.55 rears. 465 hp felt like 465 on a flat level ground but on a hill felt like 200.. never left me on the road had 1.7 million miles on it. Was still going when it got totaled. Easy to work on not too bad on parts cost and overall a good truck. 5.7 to 6.5 30-50k gross if I was light and flat driving. 5.2 -5.5 heavy 70-80k gross it had meritor axles can't remember exactly what kind. Rpm was 1650@ 70mph in top gear truck weighed 19500 full of fuel 2x150 tanks

 

I'm thinking you might have to change the whole axle assembly. I don't know if its possible to convert 40s to super 40s.

If that's the case, I bet you'd be paying at least $5k for ones out of a wreck. Then add in everything else like wheel seals, bearings, brakes, cams etc plus labour. I bet it comes out close to $15k assuming both diffs don't require a rebuild on top of that.

 

I'd have no idea what 40s or super 40s are but if you're going go through the trouble of swapping out rears go find a cut off of a Newer same model. I've seen cutoffs for around 2500-3500 with disc brakes complete assembly and at that point it's bolt and unbolt as long as drive line is the same

 

I think a super 40 is a 40k lb rated rear but with the guts from a 46k. Lighter housing but HD gears and bearings. I honestly don't know if a standard 40k rear will accept a 46k carrier.

 

In that case cutoffs would probably be best as a lots of tandems and available.