Thread: Yet another hard shift question, lol

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  1. #1 Yet another hard shift question, lol 
    SE Level Member blackthunder's Avatar
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    A while ago my 04 grand prix GT started to hard shift in the city and it was hot out. Now I didn't have my reader with me (I do now) so I couldn't check to see if it threw a code or not.

    now it hasn't happened again since and its been almost a month. A few things that I notice are the following.

    - When downshifting from 3-->2-->1 (D to 3 is fine) it shifts hard, like bangs into gear. not so bad when I slow down so the RPM's dont go above 1500.
    - When downshifting while passing it hard shifts sometimes. kinda rare in this case but happens a little bit.

    From doing countless research on this forum, my guess would have to be the EPC solenoid or rather the Pressure Control Solenoid. Same thing. Or i install a shift kit.

    now i understand that the shift kit is the cheaper way to go but im not sure if I want a shift kit in a bone stock GP, lol.

    any insight would be greatly appreciated.

    Thanks
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  2. #2 Re: Yet another hard shift question, lol 
    Turbo is the way to go. BillBoost37's Avatar
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    The shift kit limits the movement of the shift accumulators. By doing this it makes the shift happen within the specified amount of time that the pcm expects. Without it the shift is slow and this causes the pcm to set a fault and use maximum line pressure for all shifts. Aka code 1811.

    EPC or shift kit are the typical fixes.
    I drink..so consider that when reading my posts.

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  3. #3 Re: Yet another hard shift question, lol 
    SE Level Member blackthunder's Avatar
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    if it was your car? what would you do?

    financially speaking, I could get the intense shift kit and have money to buy other parts it needs. (i think my passenger axle is starting to go.lol) and other maintenance stuff like plugs and wires etc. also i think my intake gasket is starting to go (white smoke when engine is cold and under high RPM's)
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  4. #4 Re: Yet another hard shift question, lol 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    I'd get a transgo shift kit, instead of the intense one.

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  5. #5 Re: Yet another hard shift question, lol 
    SE Level Member blackthunder's Avatar
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    reasons? I ask only because I've read that most ppl suggest intense's shift kit

    Quote Originally Posted by Fivefingerdeathpunch View Post
    I'd get a transgo shift kit, instead of the intense one.
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  6. #6 Re: Yet another hard shift question, lol 
    Turbo is the way to go. REDCRAPGP's Avatar
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    If you want to break your neck at every shift get the intense. If you realize it's a Grand Prix and not a drag car and just want slightly harder shifts go with the trans go....plus it's half the price.
    Squirrels are my engine. I need a Ford Regal
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  7. #7 Re: Yet another hard shift question, lol 
    SE Level Member Crispykit's Avatar
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    I too went with the Transgo 4T65-E Shift Kit. I also added Lubegard Red 60902 which is an ATF Supplement. The transmission has 218,000 kms on it shifts perfect every time (the problem I was having was not as severe but still there). I'm really happy with it.
    Crispykit 2001 GP GT
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  8. #8 Re: Yet another hard shift question, lol 
    SE Level Member blackthunder's Avatar
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    thanks for the input guys! but still unsure of the issue when I manually downshift from 3-2 and 2-1 it slams into gear, is that still an ECS issue?
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  9. #9 Re: Yet another hard shift question, lol 
    Killa Bee Scottydoggs's Avatar
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    of course its slamming into gear when you manually down shift, your not supposed to do that. its a FWD car.

    if you must slam it in to 1 st, give it gas as you do it, by goosing the gas the engines rpm's go up the gear catches at that higher rpm smoother, then let the gas go when you feel it catch.

    you really asking for problems down shifting it into 2 or 1. its not needed.

    if you want to stop faster get F body brakes on the front of your car, its worth every last dime, and slamming on the brakes wont hurt the tranny.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  10. #10 Re: Yet another hard shift question, lol 
    SE Level Member blackthunder's Avatar
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    im not slamming it by downshifting, i could be at around 20km/h and when i downshift it slams. it shouldn't slam, at least i dont think it should lol. any other car ive driven never did that.
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  11. #11 Re: Yet another hard shift question, lol 
    Killa Bee Scottydoggs's Avatar
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    ever drive fwd before? they all slam when you drop a gear. the engine and tranny are trying to roll over in the engine bay when you down shift.

    and once again there is no reason to be down shifting. stuffs gonna break.

    20 km/h is what 12 mph in america? yeah, its gonna bang into gear at that speed.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  12. #12 Re: Yet another hard shift question, lol 
    GTP Level Member 231FUN's Avatar
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    Why the down shifting? It's an auotomatic.
    Only time you really might need to downshift is to grab a lower gear to pass.
    For driving around the city in London leave it in 3rd
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  13. #13 Re: Yet another hard shift question, lol 
    GTX Level Member dbextreme's Avatar
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    With a shift kit, you will still get banging when downshifting (possibly worse). You working the tranny by manually shifting like you are and using your trans as your brakes instead of the pedal on the floor your trans temps will sky rocket. I have a TransGo shift kit in my trans and I downshift pulling a mountain because I am tired if it going back and forth into gears. I'd rather keep it in a lower gear so just cruise up. But with this said, if I downshift with my foot off the gas at a higher speed, it bangs.

    I don't think a shift kit will help you. Drive your car normal and see if it stops... I don't hear any complaining of hard up shifts just manual downshifts, unless I misread something..
    1999 GPGT - L26, Ported Top Swap, XP Cam, 3.2 MPS, 42.5#, N*, LQ4, SD Headers, Double Roller, TEP Race Trans w/Stand alone Cooler, Precision Industries 3000RPM Stall, 75 Shot Nitrous Express Proton Kit w/Purge, 3" Dual Borla Pro XS, Corsa Dual 3.5 Tips, 5% Tint
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  14. #14 Re: Yet another hard shift question, lol 
    SE Level Member blackthunder's Avatar
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    i think you guys misunderstood me, lol. I don't always manually downshift. almost never. I did it just to test it out after having the hard shifts thinking "i wonder if it would hard shift if I manually downshift" that sorta thing,lol.
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  15. #15 Re: Yet another hard shift question, lol 
    GTX Level Member dbextreme's Avatar
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    So as you apply the break and the car shifts down as you slow down, it klunks/slams?

    How does it upshift?
    1999 GPGT - L26, Ported Top Swap, XP Cam, 3.2 MPS, 42.5#, N*, LQ4, SD Headers, Double Roller, TEP Race Trans w/Stand alone Cooler, Precision Industries 3000RPM Stall, 75 Shot Nitrous Express Proton Kit w/Purge, 3" Dual Borla Pro XS, Corsa Dual 3.5 Tips, 5% Tint
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  16. #16 Re: Yet another hard shift question, lol 
    Killa Bee Scottydoggs's Avatar
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    in that case, that banging into gear when down shifting is 100% normal.

    shift kit should clear up the hard up shifting. trans cooler cant hurt, and when you do the shift kit you'll be also doing the filter and 8 quarts of new fluid. maybe add 1 quart of trans stop slip as well, it cant hurt.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  17. #17 Re: Yet another hard shift question, lol 
    GTX Level Member dbextreme's Avatar
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    I've never been in an automatic that slammed into gears downshifting when I slowed to a stop... Sometimes if I am paying attention I can hear RPM change but that's it.

    It sounds like his car is maxing downshift pressures (if that makes sense).
    1999 GPGT - L26, Ported Top Swap, XP Cam, 3.2 MPS, 42.5#, N*, LQ4, SD Headers, Double Roller, TEP Race Trans w/Stand alone Cooler, Precision Industries 3000RPM Stall, 75 Shot Nitrous Express Proton Kit w/Purge, 3" Dual Borla Pro XS, Corsa Dual 3.5 Tips, 5% Tint
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  18. #18 Re: Yet another hard shift question, lol 
    Killa Bee Scottydoggs's Avatar
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    you got lost in the thread, he had a few harsh up shifts, then manually down shifted 2 then 1 and of course it banged into both gears.

    he said he was just testing if it shifted ok manually, and got worried cause it slammed into gear when manually down shifting, like it will.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  19. #19 Re: Yet another hard shift question, lol 
    Donating Users Bronco Boy's Avatar
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    Just put the TransGo kit in. I would rate it as a stage 1 kit.

    I have two years on mine and all is well. I downshift a lot. Mostly 4 to 3 and sometimes 3 to 2; it shifts normal. Now going 2 to 1 even at very slow speeds is uber clunky, so I stay clear of doing that.
    Chris B
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  20. #20 Re: Yet another hard shift question, lol 
    Turbo is the way to go. BillBoost37's Avatar
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    If it were mine. I'd shift kit it. That takes me about an hour with the trans service in total. EPC is going to require the cradle to be lowered, the entire drivetrain then gets lowered and you are working with the trans at an angle not originally intended etc. It's not much fun to swap the EPC.
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