Thread: 98 grand prix transmission repair questions

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  1. #1 98 grand prix transmission repair questions 
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    Hey guys my buddies gtp started to buck much like me regal did. He took it to a transmission shop, the tech there said he would have to replace the epc valve solenoid and the valve body. He got a code 1811. he was estimated 1200 dollars.

    In my knowledge with these cars. when this happens you replace the tcc solenoid, the pressure control solenoid, and the epc. You don't have to even touch the valve body am I correct.

    I contacted my local transmission shop about this they told me that replacing the valves alone would not likely fix the problem and its only like a 30% chance that it will work. Does any of this sound right to you guys?
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  2. #2 Re: 98 grand prix transmission repair questions 
    Killa Bee Scottydoggs's Avatar
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    for another 500 he could get a full re build.

    mine did the bucking deal in 3 rd gear for a while, then i lost 3 rd gear. a used tranny was my fix.

    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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  3. #3 Re: 98 grand prix transmission repair questions 
    Moderator dsmuts's Avatar
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    Just replace it It's easier in the long run
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  4. #4 Re: 98 grand prix transmission repair questions 
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    well the car only has 130k on it and shifts like a champ, it was owned by his dad before he got it. the transmission still has loads of life in it. I guess what I am asking is if he was to just get at the side pan and repair the likely suspects would that fix his problem without replacing the valve body.
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  5. #5 Re: 98 grand prix transmission repair questions 
    Killa Bee Scottydoggs's Avatar
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    theres a how to for changing those sensors, the side cover has to come off the tranny. it can be done in the car, but its not one of them 100% deals.

    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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  6. #6 Re: 98 grand prix transmission repair questions 
    GT Level Member 88formula's Avatar
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    Tell your friend to just buy my transmission. I drove the car it came out of so I know it is good. 40k original miles on it, out of a 98 GTP, has new TransGo shift kit, filter, pan gasket, and high temp Aluminum paint job. Was going to use it in my 3800 Fiero I was building, but I sold the car, and motor. $500+shipping
    1997 Regal GS, L26 N/A block, 'Reptile' Ported Gen 3 Blower w/3.5 pulley, VS cam, K&N Open Cone, Speed Daddy Headers, 3" cat and res, Dual 2.5" Dynomax mufflers w/C6 Corvette tips. PLX Wideband, Custom Dyno Tuned By Jeff @ Engineered Performance. Lucerne 17's, F-Body Brakes.
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  7. #7 Re: 98 grand prix transmission repair questions 
    Donating Users GMR Badass's Avatar
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    So the trans shop quoted your friend $1200.

    For $1375 shipped to your door with new torque converter....and not to mention a warranty.
    This is a what a "full rebuild" should really look like. Typically a trans shop only repairs the problem without thoroughly going through the entire trans inspecting and replacing wear items as needed.
    New-Back to Basix
    1999 GTP 2dr - Whipple 537whp.....for now
    1998 GTP 4dr - ST2, Cartuning PT61, IC - SOLD
    1999 GTP 2dr - SIX, GenV, Headers, TEP Trans, E85 - SOLD
    1997 GTP 4dr - 3.4, 1.9's, 3" DP, P-log - SOLD
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  8. #8 Re: 98 grand prix transmission repair questions 
    Turbo is the way to go. BillBoost37's Avatar
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    EPC and pressure solenoid are the same. Most bandaid it with a shift kit.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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