luminator94 Posted November 30, 2004 Report Share Posted November 30, 2004 Well, I just bought the 93 Bonneville, it has 88k. It shifts great until it goes into OD. Once it hits OD there's a "surge" that can be felt through the steering wheel. And if you press lightly on the accelerator while in OD, the tranny will kinda of surge on and off. Anybody have any ideas? Fluid looks great, but i think I'm gonna change the filter anyways. Aaron Quote Link to comment Share on other sites More sharing options...
terryk2003 Posted November 30, 2004 Report Share Posted November 30, 2004 sounds like possibly a problem with the lock up torque converter... :? ..but, i'm not sure... ...maybe try flush & filter first...see if it helps... Quote Link to comment Share on other sites More sharing options...
Regal_GS_1989 Posted November 30, 2004 Report Share Posted November 30, 2004 What Kinda Tranny fluid?? My Friends Dad has a tranny shop, and a guy brought in a 93 LeSabre for that same problem. Everthing was pointing to a bad Torque converter. T'ill they changed it and there was no difference. Turns out the guy was using synthetic fluid. Which he had put in in 2001. Because the car came with regular fluid, the synthetic hadn't had time to penetrate all the metal. So, they put in the regular stuff and, BAM, Perfect, no surging or anything. Quote Link to comment Share on other sites More sharing options...
luminator94 Posted December 1, 2004 Author Report Share Posted December 1, 2004 Well, after referring to the owners manual, I was wrong on the tranny itself. :oops: The tranny is a 440-T4. So does this mean that the tranny is vacuum controlled or is it still electronic? As far as fluid type, I have no idea. I plan on doing a complete flush with a new filter and gasket. Also I noticed that the gasket on the pan does leak. So, I'm wondering if the previous owner let it go low a few times and now the damage has been done? Arg.... Aaron Quote Link to comment Share on other sites More sharing options...
cutlassdude96 Posted December 1, 2004 Report Share Posted December 1, 2004 a 93 Bonneville would have the 4T60E, 440t4 is what it was called in the 80's Quote Link to comment Share on other sites More sharing options...
luminator94 Posted December 1, 2004 Author Report Share Posted December 1, 2004 a 93 Bonneville would have the 4T60E, 440t4 is what it was called in the 80's I'm just quoting what it says directly in the 93 Bonneville Owners Manual. It reads 440T4, nothing about 4T60E. Quote Link to comment Share on other sites More sharing options...
GP1138 Posted December 1, 2004 Report Share Posted December 1, 2004 a 93 Bonneville would have the 4T60E, 440t4 is what it was called in the 80's I'm just quoting what it says directly in the 93 Bonneville Owners Manual. It reads 440T4, nothing about 4T60E. I don't think the 4T60E was used until '94. The 4T60 (no E) is the same tranny as the 440T4, just new name after '90 (?) . Quote Link to comment Share on other sites More sharing options...
cutlassdude96 Posted December 2, 2004 Report Share Posted December 2, 2004 the Olds, Buick H/C-bodies used the 4T60-E starting in 91 or 92 Quote Link to comment Share on other sites More sharing options...
93CutlassSupreme Posted December 2, 2004 Report Share Posted December 2, 2004 i'd try a tuneup before starting with the trans my car shook badly in OD and TCC lockup in 3rd under acceleration new plugs, wires, and O2 sensor ended the problem. Quote Link to comment Share on other sites More sharing options...
DaveFromColorado Posted December 2, 2004 Report Share Posted December 2, 2004 .. actually, using "synthetic" fluid in a DEX-III/Merv-V trans won't work, because the "synthetic" fluid is too "slippery" due to the fact the friction modification is thru the roof. I'd recomend changin' the fluid with type F fluid (as I always recomend) and work from there. the OD clutches may be burned up and the steels between the clutches may be warped (causing the surging you are feeling) or it could be that the OD circut is slightly plugged not allowing the full ammount of pressure to get to the apply circut for that clutch itself, either way, a fluid change should* help it. --Dave. Quote Link to comment Share on other sites More sharing options...
Regal_GS_1989 Posted December 2, 2004 Report Share Posted December 2, 2004 .. actually, using "synthetic" fluid in a DEX-III/Merv-V trans won't work, because the "synthetic" fluid is too "slippery" due to the fact the friction modification is thru the roof. I'd recomend changin' the fluid with type F fluid (as I always recomend) and work from there. the OD clutches may be burned up and the steels between the clutches may be warped (causing the surging you are feeling) or it could be that the OD circut is slightly plugged not allowing the full ammount of pressure to get to the apply circut for that clutch itself, either way, a fluid change should* help it. --Dave. Yea, I know that. But apparently if you switch to synthetic fluid when the car is brand New, You should be able to pull it off, just because nothing has been broken in yet, And the Dex hasn't had ime to soak into everything. That's not me saying that, That's a 20+ year tranny expert Quote Link to comment Share on other sites More sharing options...
95 3-4 Posted December 2, 2004 Report Share Posted December 2, 2004 I use Mercon-5 in all Ford od auto's. I almost thought it was Ford specific. I would never put it in a GM car that called for Dexron3 Quote Link to comment Share on other sites More sharing options...
DaveFromColorado Posted December 3, 2004 Report Share Posted December 3, 2004 the information I got was from one of my teachers, who'd been rebuilding trani's for 20 years prior to teaching how to rebuild trani's which he's been doin' for the past 15. The fluid "soaking in" to the parts isn't really a factor, the only thing to worry about is whether or not it has friction modifiers. The Synthetic fluids of today have more modifiers then standard Dex-III/Merc-V - the only difference in the actual fluid itself (none of the additives) is that the synthetic fluid has smaller molicules, meaning it's more dense, and will offer better lubrication, but in a factory application, you shouldn't need to worry about adding synthetic fluid as the manufacturers have already made provisions to handle standard fluids. Also, people are finding that using the more dense synthetic fluid has been causing problems the fluid pumps on the transmissions - but that's just what a few people have started to find. Dex-III/Merc-V are basically the same fluid, one has more foam inhibitors (I forget which) but they are "interchangable" and most manufacturers will group them together as they will both do the exact same job. Type-F fluid has fewer modifiers in it, meaning it won't allow it to slip as much - and this will cause clutches to hold tighter, offering better transmission response, and transmission life, it also effects the clutching surfaces in the torque converter, giving a more positive lockup there too. --Dave. Quote Link to comment Share on other sites More sharing options...
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