Duramax Diesels Forum Truck of the Week
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Old 08-14-2019, 02:34 PM
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Default Alto G3 vs. GPZ

So I am looking for opinions on clutches for the Allison. I have run both in my transmission. But I am looking opinions from people with more experience.

What clutch pack and why? Is there a better option in your opinion? If so why?

Looking forward to what y'all have to say.
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Old 08-14-2019, 05:03 PM
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For what purpose? Are you looking at the GPZ stuff from Suncoast, or just the Raybestos GPZ drop in kits? G3s are holding up well from what I see, and can be had for a good price
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Old 08-14-2019, 06:07 PM
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I've been running g3s in my c2, c3, and c4s. Then alto carbonites in my c1s. Have yet had a issue. A lot of it depends on your power goals.
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Old 08-14-2019, 07:50 PM
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G4's are coming guys.
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Old 08-14-2019, 08:34 PM
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Quote:
Originally Posted by Mike L. View Post
G4's are coming guys.
Any teaser pics like last time? Or are they a similar design with just updated material?
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Old 08-14-2019, 10:28 PM
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Quote:
Originally Posted by PureHybrid View Post
For what purpose? Are you looking at the GPZ stuff from Suncoast, or just the Raybestos GPZ drop in kits? G3s are holding up well from what I see, and can be had for a good price
I have tried all 3 so far. I do like the G3ís as of right now personally.


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G4's are coming guys.
So the G3ís can kick rocks? Haha
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Old 08-14-2019, 10:29 PM
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Quote:
Originally Posted by Ne-max View Post
I've been running g3s in my c2, c3, and c4s. Then alto carbonites in my c1s. Have yet had a issue. A lot of it depends on your power goals.
Thatís what Iím interested in. Is there a preference for high HP vs. low HP? Towing vs. race truck?
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Old 08-15-2019, 06:22 AM
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Mike is the G4's going to help with the no throttle coasting downshift clunk on the 5spd's when using G3's?

That being said I deal with the downshift problem for the better clutches in the C3/C4's
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Old 08-15-2019, 06:46 AM
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Quote:
Originally Posted by rcr1978 View Post
Mike is the G4's going to help with the no throttle coasting downshift clunk on the 5spd's when using G3's?

That being said I deal with the downshift problem for the better clutches in the C3/C4's
The clunk should go away since we will not use the key hole design with the G4's. There will also be more clutch surface area and the kolene steel plate surface will be better.
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Old 08-15-2019, 08:37 AM
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So is it looking like G4 will be the hot ticket in a 1000hp+ trans once they are released? Would that be ideal for all clutch packs?
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Old 08-15-2019, 09:10 AM
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Yes.
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Old 08-15-2019, 09:21 AM
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Quote:
Originally Posted by Mike L. View Post
Yes.
Is there any timeframe on these? 2 months, 6 months, 2 years? Just curious as my truck is down with needing a trans overhaul. Not meaning to hyjack.
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Old 08-15-2019, 09:40 AM
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Quote:
Originally Posted by Frank_DMAX View Post
Thatís what Iím interested in. Is there a preference for high HP vs. low HP? Towing vs. race truck?
For high HP I would say the Suncoast GPZ setup is very good, did you have a failure with these? Obviously others agree that the G3 is very capable too.

I have installed the Raybestos GPZ drop in kits for tow trucks / wreckers and they are doing well. Power is slightly above factory (actually in a MD behind a DT466). I wouldn't recommend this for a hot street truck, simply because better stuff is available. Not that you can't get it to hold, but all the G3 packs can be bought for a few hundred more.
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I can't complain, but sometimes I still do
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Jesse
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Old 08-15-2019, 04:38 PM
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Quote:
Originally Posted by PureHybrid View Post
For high HP I would say the Suncoast GPZ setup is very good, did you have a failure with these? Obviously others agree that the G3 is very capable too.

I have installed the Raybestos GPZ drop in kits for tow trucks / wreckers and they are doing well. Power is slightly above factory (actually in a MD behind a DT466). I wouldn't recommend this for a hot street truck, simply because better stuff is available. Not that you can't get it to hold, but all the G3 packs can be bought for a few hundred more.
No I have not had any issues on the one I did a SC GPZ kit on. Been on the G3 train lately. But it seems polarizing.
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Old 08-15-2019, 07:21 PM
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Quote:
Originally Posted by PureHybrid View Post
For high HP I would say the Suncoast GPZ setup is very good, did you have a failure with these? Obviously others agree that the G3 is very capable too.

I have installed the Raybestos GPZ drop in kits for tow trucks / wreckers and they are doing well. Power is slightly above factory (actually in a MD behind a DT466). I wouldn't recommend this for a hot street truck, simply because better stuff is available. Not that you can't get it to hold, but all the G3 packs can be bought for a few hundred more.
The G3's will take more power than the GPZ's and live. That's a fact.
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