5 Star Confused
Fleet Mechanic
Joined: Dec 2016
Posts: 1,810
Likes: 539
From: Florida
Yes, Yukon is cutting 4.56 and 4.88's. My 4.88's are ordered and about to go in. There is no carrier break for the rear end, the front requires the thick cut gears.
For those wanting to go deeper than 4.30, hypertech makes an inline module(sold by 5 star) that goes behind the cluster. This will adjust for the gears greater than 4.30 and tires taller than 35". That's the limits of the SCT tuner. I will add the 5 star SCT tuner, which can be ran with the hypertech module after my power train warranty expires.
For those wanting to go deeper than 4.30, hypertech makes an inline module(sold by 5 star) that goes behind the cluster. This will adjust for the gears greater than 4.30 and tires taller than 35". That's the limits of the SCT tuner. I will add the 5 star SCT tuner, which can be ran with the hypertech module after my power train warranty expires.
But speaking of... When talking towing, I see all the time where folks go bigger gears, but also bigger tires, which in and of itself is fine. To each his own. But my point is that folks always talk of doing gears and bigger tires thinking they're improving performance, when they're actually only maintaining the same performance but with bigger tires.
Folks who truly want to improve towing go with lower gears and keep the same tires.
Postmaster
Joined: Aug 2015
Posts: 3,146
Likes: 32
From: Maryville, TN
Originally Posted by kry226
What do gears affect that needs the Hypertech? I don't think any modern truck's speed is influenced by gears, correct? Of course tires do.
But speaking of... When talking towing, I see all the time where folks go bigger gears, but also bigger tires, which in and of itself is fine. To each his own. But my point is that folks always talk of doing gears and bigger tires thinking they're improving performance, when they're actually only maintaining the same performance but with bigger tires.
Folks who truly want to improve towing go with lower gears and keep the same tires.
But speaking of... When talking towing, I see all the time where folks go bigger gears, but also bigger tires, which in and of itself is fine. To each his own. But my point is that folks always talk of doing gears and bigger tires thinking they're improving performance, when they're actually only maintaining the same performance but with bigger tires.
Folks who truly want to improve towing go with lower gears and keep the same tires.
If a person throws 4.30s in a truck with 37's, then your correct, your not really gaining any towing performance. Your rpms may be the same, and you will increase some torque to the tires, but the torque is offset by the extra rotating weight of the tires. BUT, I have a 3.73 truck, going to 4.88's with 37's which gives me essentially the same final gearing as a truck with 4.30's and 31.5" tires. No, it want be quite as quick as a 4.30/31.5" truck, but the towing experience will be better than a 3.73 truck.
Your probably function over form, which is fine, but I'm form over function without losing function. This is why I spent an extra $520 on tires to get e rated. I also bought a 3.5" lift versus 6" so I could fit in the car wash and keep my center of gravity down when towing. I bought wheels with the correct hub bore. I should also be able to tow a 5th wheel if ever needed. So yes, you can go bigger tires and improve on towing.
Way
Hotshot
Joined: Mar 2017
Posts: 10,156
Likes: 1,369
From: Chaz
Yes, Yukon is cutting 4.56 and 4.88's. My 4.88's are ordered and about to go in. There is no carrier break for the rear end, the front requires the thick cut gears.
For those wanting to go deeper than 4.30, hypertech makes an inline module(sold by 5 star) that goes behind the cluster. This will adjust for the gears greater than 4.30 and tires taller than 35". That's the limits of the SCT tuner. I will add the 5 star SCT tuner, which can be ran with the hypertech module after my power train warranty expires.
For those wanting to go deeper than 4.30, hypertech makes an inline module(sold by 5 star) that goes behind the cluster. This will adjust for the gears greater than 4.30 and tires taller than 35". That's the limits of the SCT tuner. I will add the 5 star SCT tuner, which can be ran with the hypertech module after my power train warranty expires.
I mean set it with the 34 inch 20's and 3.31 gears? Or vice versa...
Postmaster
Joined: Aug 2015
Posts: 3,146
Likes: 32
From: Maryville, TN
Your speedo would be off, tire size is all that effects speedo, it's just a reading off the tone ring. It COULD correct shift points, idk, but why cheap out on a new truck? The set up to fool mine would be 31.5" tires and 4.30's.
Hotshot
Joined: Mar 2017
Posts: 10,156
Likes: 1,369
From: Chaz
I just kinda remember in the last gen dodge trucks if you had 4.10 gears and put on larger tires the dealer could change your gear setting in the computer to 3.73 and it would fix you up.
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