4.6L (1996-2004 Modular) MustangTechnical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within. Sponsored by Cruizin Concepts
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I just got the car back with a rearend rebuild, 4.10 gears with the sf3 tuner to complement it. It's an AUTO 01 GT. It jerks very slightly when accelerating and when accelerating from a stop, it goes all the way to 3k revs in first gear before it shifts. It jerks slightly for all gears when acceleration. When decelerating, it jerks hard going only into 2nd and I feel myself lunge forward -like engine breaking.
It's bone stock AUTO, called the guys at BAMA and they're going to send me another tune but.. Should it feel like that when I shift? I thought with a tune it would shift smoothly like a stock auto.
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if you told bama you have 4.10s bama probably upped the line pressure for your trans to get it to shift harder and faster. smooth shifts are when the computer lets the tranny slip a bit before catching the next gear.. and are much slower shifts..
you'll really notice the hard "clunk shifts" when you get on it hard, and than let up to about half throttle right before it shifts..
11:1 forged motor, CMS stage 2.5 NA cams,Nitrous express plate kit(100 or 150 shot havent decided), mac lt's, BBK 78mm TB unit, 24# Injectors, Hughes performance built 4r70w W/ 3200 stall. Awaiting dyno tune...
2005 F150 supercrew 4x4. Leveled front with an Add-a-Leaf in the rear.Sitting on 33's W/ a nice system.
a ford mechanic friend once told me that autos work better when the shifts feel "harder" as you say, because by allowing the tranny to "slip" as mentioned previously, you are actually putting more wear on its components. unfortunately, the general public prefers ultra-smooth shifts over tranny life and performance, so the hard shifts you're feeling wouldn't feel "normal" to the average auto driver. therefore, no, you should actually be experiencing less wear on your engine and transmission components (provided bama tuned the shifts correctly).
__________________ 2002 Mustang GT: Sonic Blue
BBK 75mm TB, BBK Chrome LT's & O/R H-Pipe, Flowmaster Cat-Back: 233rwhp/272rwtq
JLT SRA, MGW STS, UPR 3 Hook Quadrant & Quick Click FWA, Delta Force Commando, LC-1 Wideband, 180º tstat, Pro Products Upper Plenum, Motive 4.10s, UPR Adj LCAs, MM PHB, 24# injectors, MM FLSFC
2002 Expedition XLT: Premium Sport 5.4L
1999 F-150 XLT: Ext. Cab Flareside 4.6L
Deep Wedgewood Metallic
IMCO Muffler - Dual Pipes, K&N FIPK II
It does seem odd that the trans refuses to shift below 3000rpm. There is no need to cruise thru town at 2900rpm if there are higher gears available in the trans.
That's what I thought, I thought that with town driving the 4.10 gears would get me up into overdrive sooner. But lets say i'm just going from a stop, the car will go up in revs and won't shift even if I feather it a little around 2k. When I get up to 3k it shifts. To explain the feeling, it's almost like the car started from a stop in 2nd gear. I don't feel ANY power at all from first gear unless I punch above 3k. Even at 2k in 1st gear I'm barely going 20 mph and it still won't shift.
Also when you guys say firm shift, does the whole car kind of jerk? When the gears jerk the whole car actually jerks forward a bit. I thought that with just a little throttle I should feel comparable acceleration
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