Just kind of curious,can you get a Allision tranny with the 6.0L? I thought you could only get it with the Duramax.Just thought I would ask.

 

I almost purchased a 2500HD-crew cab LT/4x4/8.1-Allison. I thought you could only get the Allison in the HD trucks no matter what motor? You can get a ZF 6 speed...

I do know only 4.10:1's come with the 6.0 and you can get 3.73:1 or 4.10:1 with the 8.1 or Duramax.

The more I think about it, the more I wish I would have gotten an HD. Looks cooler and much stronger parts. 10.5" rear end, 9.5" IFS (I think), 4L80E or Allion trans. But most importantly... a bigger motor! 6.0 or 8.1 or Duramax. But the gas milage isn't too good on those huge trucks, I think that is what stopped me.

 

Allison is only available with the Max and 8.1. Mileage sint that bad, YET! With 35's and 6" of lift I get about 12.5 City and 14.0 highway.

Question on the Yank converter. Since it has higher stall will that make my tranny heat up quicker while towing?

I am wanting the extra *** for towing purposes. That is why i am looking for a low end grunt cam.

 

It may make it run a slight bit hotter but nothing a $45 trans cooler won't cure, either way a huge trans cooler when towing is always cheap insurance. Besides you will be able to get up a get into the power much, much faster. http://www.converter.cc/trucks_and_suvs.htm I'd suppose you want the 2600HD converter. The STR is pretty low on it so I'd give them a call for a custom higher STR. That is the Static Torque Ratio if I remember the acronym correctly. That will multiply input torque many more times than stock, it would feel like you gained a good amount of torque.

Part of your problem is you went from 4.10:1's with like 31" tires to a 6" lift and 35" tires. Every 1" you go up in tire height drops a .1 from your axle ratio. So now you roughly have a 3.70:1 axle ratio with a really tall 2.4:1 first gear in your trans. Those giant tires are also jacking with your gas milage too due to the increased weight.

I would consider a gear swap to 4.56:1s for front and rear to go back to stock performance also, but that does get costly.

Cam wise maybe a 212/218 114lsa cam advanced 2-4* may be what you are looking for. Hell I think you can get a cam with advance built in and then manually advance it when degreeing it. Best bet to call those guy at Absolute Speed I mentioned and tell them you need a stump puller or whatever you call what you are looking for. lol *** loads of torque and heads to match.

When you advance a cam it brings the powerband down and when it is retarded it brings the powerband up.

 

Thanks for all your help so far.

 

Sure no problem at all. Maybe someone else will chime in with some input. But now you have quite a few ideas on where to start.

 

Far as the big trucks sucking gas, I get 10.7 MPG average since new. But still I only fill up with premium gas once a week and pay $40 bucks opposed to my last truck a 01 S10 that used $25 a week. That $35 dollars extra a week to have a truck thats twice as fast, gets twice the attention, and makes me proud to own and show off, the $35 bucks extra a week feels awfully cheap.