Please explain a shift kit.
Thread Starter
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Mountain Pass
Joined: Jul 2019
Posts: 144
Likes: 2
Please explain a shift kit.
I just had a shift kit installed, now when it's down shifting from 2nt to 1st there's a slight hard shift. My trans. rebuild shop said that's what happens when you install a shift kit, you will now feel it shifting. If this is true then why add a shift kit when rebuilding a trans. Besides this problem the trans runs great.
01 f150 4.2 auto
01 f150 4.2 auto
Lead Driver
Joined: Sep 2002
Posts: 9,549
Likes: 2,034
From: North Texas
I put SKs in everything, not just to have better shift quality but to increase fluid flow all over internally...or dumping gross PWM converter lockup. OEMs have missed many things accidentally or they had to for shift quality for the masses...aka soft and flaccid. Old Mercedes shift firm from the factory, just how the 722s shift.
It should not clunk on a downshift. You may notice it, but it should not be aggressive at all. I always have mine setup on the most mild settings available. One can increase fluid volume to balance shift quality as needed, removing or reswapping hard parts is never fun.
I have a Superior Towpower kit in my Screw's 4R70W and billet OD servo. Shifts nice, quick, clean.
Ask what kit was installed or if they did the common J-Mod. As I know Superior and Transgo are only companies that make full kits.
It should not clunk on a downshift. You may notice it, but it should not be aggressive at all. I always have mine setup on the most mild settings available. One can increase fluid volume to balance shift quality as needed, removing or reswapping hard parts is never fun.
I have a Superior Towpower kit in my Screw's 4R70W and billet OD servo. Shifts nice, quick, clean.
Ask what kit was installed or if they did the common J-Mod. As I know Superior and Transgo are only companies that make full kits.
Hotshot
Joined: Jul 2020
Posts: 10,529
Likes: 2,657
From: Near Salt Lake City
Shift kits make the trans shift firm, or crisp i
Stage 1 kits are nice on components
Stage 2 you start to get a hard shift
Stage 3 shift kits are down right gnarly hard shifts
All are designed to not "***** foot around" with the shift
They want it "now" with "no delay" as to save the clutches from wear
It is the prolonged shifts that destroy transmissions as far as towing or racing is concerned
Stage 1 kits are nice on components
Stage 2 you start to get a hard shift
Stage 3 shift kits are down right gnarly hard shifts
All are designed to not "***** foot around" with the shift
They want it "now" with "no delay" as to save the clutches from wear
It is the prolonged shifts that destroy transmissions as far as towing or racing is concerned
Hotshot
Joined: Jul 2020
Posts: 10,529
Likes: 2,657
From: Near Salt Lake City
Maybe
Not sure
Precision transmission
Watch a few videos of his
He knows alot about shift kits and all the particulars
There are about 75 shift kits out there
Tons of mods, leaving springs and ***** out etc.
Without knowing exactly which shift kit the rebuilder used, it's hard to say exactly what your trans should be doing
They gave you some sort of warranty, right?
Not sure
Precision transmission
Watch a few videos of his
He knows alot about shift kits and all the particulars
There are about 75 shift kits out there
Tons of mods, leaving springs and ***** out etc.
Without knowing exactly which shift kit the rebuilder used, it's hard to say exactly what your trans should be doing
They gave you some sort of warranty, right?
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Fleet Mechanic
Joined: Jun 2023
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From: WA
Seems like the basic question is whether or not the hard downshift will hurt anything. Probably not, so if it's not annoying maybe you should just live with it. Good luck.
Or take it back and tell the guy it shifts hard. Maybe there's a simple fix.
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Frmr Ford Trans Engr
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From: SE Florida
A lot of rebuilders always install their favorite shift kits. They believe that it will help with the longevity of the transmission. Maybe they are right...
Thread Starter
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Mountain Pass
Joined: Jul 2019
Posts: 144
Likes: 2
Used a Jr. shift kit.
Still under warranty. Shop owner said they used a JR. shift kit. He said with the new springs it will cause this to happen at lower gears. He said it should take about 20,000 miles before that slight jerking feeling to go away.
Cross-Country
Joined: Aug 2024
Posts: 89
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From: Northern VA
19,900 mile warranty?
Lead Driver
Joined: Sep 2002
Posts: 9,549
Likes: 2,034
From: North Texas
Probably this kit
https://transgo.com/product-details/sk-aode/
2-1 clunk/harsh is odd as just releasing int clutch on the 70W, if it actually that specific downshift. Have you tried manually downshifting from say 5mph? Or going wide open from second to first after that shift to force the downshift?
Without another party riding in it, cannot say if odd or not.
https://transgo.com/product-details/sk-aode/
2-1 clunk/harsh is odd as just releasing int clutch on the 70W, if it actually that specific downshift. Have you tried manually downshifting from say 5mph? Or going wide open from second to first after that shift to force the downshift?
Without another party riding in it, cannot say if odd or not.