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Thread: Best streetable 4K springs? Reply to Thread
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  Topic Review (Newest First)
01-15-2020 02:06 PM
dauntless89
Quote:
Originally Posted by gear_grinder View Post
reasons?
They run alright as a 3k but the base geometry results in a really imbalanced spring pack when ran as a 4k. There's a very touchy spot from 1500-1700 rpm where the pump almost self-throttles until RPMs are out of that range. Greatly frustrating with a manual and while towing. It's easier to deal with in an auto, especially with a stock or higher stall converter. This sensitivity can be improved by machining the bases and correcting the preload in the pack. In my case (160 pump), even after running them on a lathe I still had to adjust them on the loose side to keep off-idle throttle response what I would call "good." For me, they were never more than a 3500-rpm kit when set up for a daily driver.

This is seriously old news though. This debacle of mine occurred back in 2014 when I installed the PacBrake springs. When I came here and complained about it, I was met with a "yeah, everyone knows that."

In fairness, PacBrake may have changed the base design in the last few years (I don't know and don't care), but if not, they are the absolute worst option on the market.
01-15-2020 01:09 PM
Drothgeb Mine runs well with the pac brakes, but I’ve got a pretty loose tc. I can see them being too touchy with a manual. They’ll let me rev to 4500 too.
01-15-2020 12:43 PM
gear_grinder
Quote:
Originally Posted by dauntless89 View Post
PacBrake springs are terrible.
reasons?
01-15-2020 11:44 AM
Nascar Not all 4000gsk's are the same, as some have pointed out. 24hrsparkey your brand is obviously too touchy. What your describing is similar to 90% of the 5k ones. The GSK Antonm's is running is smooth, as I've run the same brand 4000gsk with 5sp & 6sp duel disk and it's a non issue, even at lower than ideal rpm ( speaking of under 1500 rpm which one should not really be driving with any load on engine ).
01-14-2020 02:26 PM
24hrsparkey
Quote:
Originally Posted by Antonm View Post
I'm curious what you mean by this too. I have 4k springs with a 5 speed running a single clutch and the truck drives great. The governor springs actually made it easier to drive because 4th gear (in an NV4500 anyway) is now useful when merging onto the interstate, whereas before the truck would just nose over at 2200rpm causing a short shift into 5th and dropping off the turbo.

What does "get ignorant" mean?? And does having a dual disk clutch somehow affect this ignorance?

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Edit: Sorry, I was typing the above reply at the same time your were and your answer got posted before mine. My truck doesn't exhibit the issues you're talking about. And it should spring wrap easier than a stock truck considering it's lifted with blocks in the back.
If you have the time and inclination , you could try adjusting the springs a click or two looser to see if that helps with the touchy throttle.
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Thank you , yeah with the duel disk engagement being a bit abrupt / solid combined with the 4k springs , probably worn out rear springs it can buck pretty good at times .
Yes you are probl correct , some messing with the springs is in order
01-14-2020 01:23 PM
Antonm
Quote:
Originally Posted by 24hrsparkey View Post
I can tell you 4k springs with a 5speed duel disk ,, can get ignorant .
I'm curious what you mean by this too. I have 4k springs with a 5 speed running a single clutch and the truck drives great. The governor springs actually made it easier to drive because 4th gear (in an NV4500 anyway) is now useful when merging onto the interstate, whereas before the truck would just nose over at 2200rpm causing a short shift into 5th and dropping off the turbo.

What does "get ignorant" mean?? And does having a dual disk clutch somehow affect this ignorance?

.
.
Edit: Sorry, I was typing the above reply at the same time your were and your answer got posted before mine. My truck doesn't exhibit the issues you're talking about. And it should spring wrap easier than a stock truck considering it's lifted with blocks in the back.
If you have the time and inclination , you could try adjusting the springs a click or two looser to see if that helps with the touchy throttle.
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.
01-14-2020 01:17 PM
24hrsparkey
Quote:
Originally Posted by myother4x4isaCJ7 View Post
Why is that? Touchy throttle? You could try playing with the preload on the springs to see if you can tune it out. But mine is auto so won’t have those issues.
True you will not in an auto.

In a manual the " solidness " of the driveline ( no slippy converter to dampen anything ) combined with the 4k springs touchy throttle , bumpy ride and rear spring wrap/un wrap can give the truck a " bucking boot scoot'n boogey " at times even driving normally ( im olden ) . Nothing one can do , but cease what you are doing and start over .
Just life with 4k springs , other mods and a manual. Not a huge deal .
01-14-2020 12:07 PM
myother4x4isaCJ7
Quote:
Originally Posted by 24hrsparkey View Post
I can tell you 4k springs with a 5speed duel disk ,, can get ignorant .
Why is that? Touchy throttle? You could try playing with the preload on the springs to see if you can tune it out. But mine is auto so won’t have those issues.
01-14-2020 09:29 AM
24hrsparkey I can tell you 4k springs with a 5speed duel disk ,, can get ignorant .
01-13-2020 05:01 PM
dauntless89 PacBrake springs are terrible.
01-13-2020 04:23 PM
Antonm I've only ever installed one set of governor springs, but they went off without a hitch. They installed fine, no weird or weak idle, they just work like they're suppose to. I suppose I just got lucky, but I got mine from a Canadian seller on amazon by the name of DieselTuff.
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01-12-2020 12:26 AM
myother4x4isaCJ7 Sweet thanks ill probably use Seth farrel or pdd budget builder depending on who’s cheaper.
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