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  #373  
Old 05-13-2016, 12:44 PM
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Re: For those who drive a Hemi 5.7

https://en.m.wikipedia.org/wiki/ZF_8HP_transmission Has a nice table specifying which vehicles use the various transmissions. Note that for the 8HP45 units used in other vehicles, it says a SEPERATE 845RE is used by Chrysler, so the V6 transmission is unique to Chrysler applications helping to explain the numerous issues vs. the 45's use on the other vehicles listed in the table.

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  #374  
Old 05-14-2016, 01:18 AM
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For those who drive a Hemi 5.7

845RE is for the V6 non diesel the V8 5.7, V8 6.4 and V6 3.0 get the 8HP70.

Diff torque rating 450 vs 700 Newton

Only the 845RE is built in US (Indiana)


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  #375  
Old 05-14-2016, 03:26 AM
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The 8HP70 for the GC is actually built in the US in South Carolina. The big difference mentioned above is that chrysler builds the 845RE under ZF license in Indiana. The 8HP70 is made at an actual ZF plant in South Carolina. The early MY 2014 GCs recieved their 8HP70s from the German ZF plant but sometime in the 2013-2014 time period it changed and the 8HP70s began coming from south carolina.
So the MY2014+ GCs have either a
ZF built in Germany 8HP70
ZF built in USA 8HP70
Chrysler built in USA 845RE

Thats one benifit about having an early MY2014 GC v8/diesel we got the ZF German built 8HP70
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  #376  
Old 05-14-2016, 02:22 PM
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Re: For those who drive a Hemi 5.7

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Originally Posted by silvermax04 View Post
Everything else is not "the same" on the drivetrain between the two. The 5.7 has got larger diameter rear axles with different gear ratios, 16 quart radiator vs 10.4 quart, larger higher capacity fan and of course larger 8hp70 trans. It's also got larger diameter front rotors and I'm sure there are other things I'm forgetting not a huge amount of weight in any one of those alone but added together there is a little bit there, how much exactly who knows. v8 is probably less than 200 lbs heavier and that's actually a lot less than what I thought it was going to be before I started looking up numbers. The 5.7 is also a pretty cheap option I know it's increased some but when I bought my 2014 it was $2699 option after discounting it was like a $2300 option when considering a 55k vehicle that's pretty minimal to move from a v6 to a v8 engine combine that with cheap gas and not much of a decision in my book. But I get some people could careless about power and engines so why spend an extra dime on an engine just stay with the base. For people that do care the v8/8spd is a great combo.
The only thing different is the rear differential ring gear diameter on 4x4 models. Everything else is the same. Even the coolant capacity is only 1/2 qt difference. Basically what the difference the engine holds. You can look at the jeep supplied specs.
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  #377  
Old 07-01-2016, 06:37 PM
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Re: For those who drive a Hemi 5.7

The only reason I bought the 3.6L Pentastar was because the 5.7L is no longer available to order in Aus. I'm happy with the power of the 3.6L and the engine note when I put my boot into it.
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  #378  
Old 07-01-2016, 06:54 PM
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Re: For those who drive a Hemi 5.7

Not to derail the thread, but speaking of HEMI's, Jay Leno just wrecked in a real nice one.

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  #379  
Old 07-14-2016, 10:29 AM
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Re: For those who drive a Hemi 5.7

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Originally Posted by lansbury View Post
Wife said why the HEMI and I said for once I am making the fun choice not the sedate sensible money saving one.

This.... I chose the V8 based purely on the fun factor.

My last vehicle was a V6 Mustang and really loved the beauty of her lines, but I always had that feeling that something was missing during our two year courtship. I actually knew exactly what was missing, coming from a history of owning V8s, I was disappointed with the sound of the car. Sure, it got great fuel mileage, but where's the noise, you know??? The exhaust will be my first major upgrade I do to the Jeep, and possibly the only thing I change. Frivolous... maybe. Fun... DEFINITELY!
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  #380  
Old 07-15-2016, 11:11 AM
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Re: For those who drive a Hemi 5.7

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Originally Posted by silvermax04 View Post
It will losen up a little but dont expect huge mileage gains. Mileage is going to be all over the map depending on who is driving and your situation, i get about 18 mixed on the v8. If you search around on here the general real world mixed mileage difference between the 6 and the 8 is not that much for the 2014-15s. The 16s promise to be a little better at increasing the gap some. I personnelly never considered the 6 i wanted something that moved around a little better for the heavy weight of this vehicle. I didnt care about mileage not that theres much to care about with the low cost of fuel these days. The up front cost of the v8 is really the biggest consideration is the extra $3200 or what ever it is worth the extra cost worth it to someone. I have been driving a 2014 v8 with the 8spd for three years now and it really is a great combination, its very effortless smooth acceleration. I would not describe it as fast but its great to drive and handles the weight of the vehicle well.

I am coming from a TBSS (LS2 with a built 4L70E) into the Hemi 5.7 with 8spd. I am very impressed so far with the power and performance. I don't think anyone ever buys a v8 for MPGs, at least I don't. Heck I plan on doing some more stuff to wake it up a bit.

Really liking what I am starting with. Don't know if I could go back to a v6. I may be ruined.
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  #381  
Old 07-18-2016, 10:27 AM
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Re: For those who drive a Hemi 5.7

I am looking to move from a 2012 5.3L Chevy Avalanche to a new GC and will be towing either a clam shell snowmobile trailer or a smaller TT in the north east. Would the Hemi give similar towing experience as the Avalanche? I started looking at the V6 diesel but don't like seeing the issues with it.
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  #382  
Old 07-18-2016, 11:22 AM
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Re: For those who drive a Hemi 5.7

I would have to say that having the hemi,you won't have any issues towing that clamshell.
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  #383  
Old 07-18-2016, 11:42 AM
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Re: For those who drive a Hemi 5.7

Quote:
Originally Posted by jmak View Post
I am looking to move from a 2012 5.3L Chevy Avalanche to a new GC and will be towing either a clam shell snowmobile trailer or a smaller TT in the north east. Would the Hemi give similar towing experience as the Avalanche? I started looking at the V6 diesel but don't like seeing the issues with it.

I use my 5.7 to tow jet skis and have zero issues. I've never had an Avalanche, but prior to my Jeeps I had the Sport Trac with the 4.6 V8 and honestly the difference is night and day.


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  #384  
Old 07-18-2016, 11:59 AM
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Re: For those who drive a Hemi 5.7

Quote:
Originally Posted by jmak View Post
I am looking to move from a 2012 5.3L Chevy Avalanche to a new GC and will be towing either a clam shell snowmobile trailer or a smaller TT in the north east. Would the Hemi give similar towing experience as the Avalanche? I started looking at the V6 diesel but don't like seeing the issues with it.
Power wise it should be the same, but th GC has a lot shorter wheelbase which you will notice in crosswinds. That is why a lot of guys use hitch stabilizers
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