Monteman1971 Posted December 9, 2007 Share Posted December 9, 2007 I have a 454 with a turbo 400. Under normal driving conditions the trans shift properly but at WOT it won't shift from 1st to 2nd without letting off the gas and then stomping it again? I changed the vacuum module but after reading about it, it only effects the trans under normal driving and does not play a part at WOT because there is no vacuum at that time........ Any help would be appreciated..... Thanks, Steve Quote Link to comment Share on other sites More sharing options...
bobsmc Posted December 9, 2007 Share Posted December 9, 2007 not sure but i think the down shift is controled by a switch on the pedal in the car. it may be out of adjustment. Quote Link to comment Share on other sites More sharing options...
1972mc Posted December 9, 2007 Share Posted December 9, 2007 Got no answer to your question, but---I see you've got your latest photo. Love the new hood. I saw the pics of the hood during prime/paint. Carl Quote Link to comment Share on other sites More sharing options...
monte70car Posted December 9, 2007 Share Posted December 9, 2007 the 400 uses a elec kit down stwich that is mounted on the gas padel. the wires might have come unhook either on the trans or on the stwich. u can still get the stwich here is what it looks like part code is ATE-2101 price is $26.95 from www.ss396.com Quote Link to comment Share on other sites More sharing options...
Mike 57 Posted December 9, 2007 Share Posted December 9, 2007 Sounds like an issue with the governor. I played around a lot trying to get the perfect shift points and with some combos of springs and weights it would shift exactly like that. I would have to let off fo it to shift. If it was the switch the tranny would not downshift. Quote Link to comment Share on other sites More sharing options...
Monteman1971 Posted December 10, 2007 Author Share Posted December 10, 2007 The down shift switch is working because under normal driving conditions, if I step down it does down shift. My problem is up shifting from 1st to 2nd....it doesn't want to. Mike, of all things, transmissions are a mystery to me...it's that magical thing under the car that changes gears.....lol. Now I do have skills but is messing with the "governor" something that I can attempt on my own or is it something I should leave to a pro? And if so, does the transmission have to come out? I would hope not being that it sounds like you had to make more than one attempt to get yours where you wanted it.... Carl, I just posted some new pictures in the "General" forum that show the hood better. Thanks, Steve Quote Link to comment Share on other sites More sharing options...
Mike 57 Posted December 10, 2007 Share Posted December 10, 2007 Steve, the tranny does not have to come out to service the governor. It is under the little square cover with the round top on the side of the tranny. If you can get one out of another th400 you can swap it and see if it fixes your problem. 20 min to change. Quote Link to comment Share on other sites More sharing options...
Monteman1971 Posted December 10, 2007 Author Share Posted December 10, 2007 Thanks Mike...I'm going to check my service manual and give that a wack.....Other than getting another one out of a different unit...because I don't have one....lol....Do you think I can get the parts from my local transmission shop... Steve Quote Link to comment Share on other sites More sharing options...
Grease Posted December 11, 2007 Share Posted December 11, 2007 Steve have you changed the rear axle / ratio ? If so the govenor may not be sending the shift signal. As Mike57 says sounds like the govenor . If you have a local tranny shop that will work with you thats a good choice . I find my local shops dont like to talk . Good Luck . Quote Link to comment Share on other sites More sharing options...
Guest Phils72 Posted December 12, 2007 Share Posted December 12, 2007 Hey guys I am somewhat new to the club, but maybe I can shed a little light on tranny troubles. I build automatics for a living, and build HP trannys for local racers. The problem sounds like you have to little govenor pressure. This is a common problem on TH 350 & 400's. Even if it has been built, most rebuilders do not check the govenor bore in the case. Most of the time they need to be sleeved in order to have the right specs from case bore to govenor. One thing to check, is to take the 4 bolts out that holds the govenor plate on. you will loss a little fluild not much, but have something to catch it. After pulling the plate, remove the govenor. Check for deep lines on the govoner shaft. If you can feel the lines with your finger nail, good chance it's worn. If you have a transmission parts house near call and get a new gov. This may help closen the specs enough to fix the problem. If not it needs to be sleeved.If I can help you get the parts you need let me know I will do what ever I can to help a club member. Phil Quote Link to comment Share on other sites More sharing options...
MonteAZBB70 Posted December 12, 2007 Share Posted December 12, 2007 Welcome, Phil. I'm sure I speak for others when I say it's nice to have another subject matter expert onboard. Get prepared to be bombarded with PM's! Mike Quote Link to comment Share on other sites More sharing options...
Monteman1971 Posted December 14, 2007 Author Share Posted December 14, 2007 Thanks Phil.....I'm going to look into that. Is there a gasket that will need to be repalced? Will it come with the new govenor? The tranny was a fresh rebuild before I got the car but I really don't know what was done. I don't think so but can the adjustment on the vacuum modulator be effecting this at all? The weather has been pretty bad here so I haven't been able to test much. On the module should it be turned in or out for performance shifts? Thanks again and welcome to the club!!!!!!!!!! Steve Quote Link to comment Share on other sites More sharing options...
Guest Phils72 Posted December 16, 2007 Share Posted December 16, 2007 You will need to get another gasket, I doubt it will come with the gov. As far as the modulator, it's purpose is for part throttle upshifts and your downshifts. At wot modulator pressure is bypassed, so all you are working with is gov pressure. If the tranny is shifting early or late, at part throttle (Normal driving)then you can adjust the modulator to help with that. If you can't find a new gov and gasket, call me and I cane get you one and send it to you. 704-460-6456 leave message if I don't answer. Phil P.S. Your car looks great. Where can I find fiberglass fenders? Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted December 16, 2007 Share Posted December 16, 2007 try http://www.glasstek.com/ Quote Link to comment Share on other sites More sharing options...
John Burns Posted December 16, 2007 Share Posted December 16, 2007 I remember recalibrating my governer- I think I had this same issue- it was a long time ago, B&M has this kit: http://store.summitracing.com/partdetail.asp?autofilter=1&part=BMM%2D20248&N=700+115&autoview=sku Quote Link to comment Share on other sites More sharing options...
Guest XXXXXXX Posted December 26, 2007 Share Posted December 26, 2007 Phil, Great to have you onboard! And a transmission expert to boot! Two questions, when sleeving the gov. bore does the bore need to be enlarged and if not can a sleeve be installed with the trans in place? Thanks. Quote Link to comment Share on other sites More sharing options...
Guest Phils72 Posted December 27, 2007 Share Posted December 27, 2007 Yes, you will have to bore the case over size. The only problem is the tool to do this is pretty high. Because of the metal shavings this will cause. it is best to have it out and torn down, but I have done it with the tranny out of the car and stood up on the output shaft with the rear housing off, it's not easy but it can be done. The good news is the sleeve now comes prbored to fit a new gov, so you don't have to cut the sleeve to size. Hope this helps. Phil Quote Link to comment Share on other sites More sharing options...
Guest XXXXXXX Posted December 27, 2007 Share Posted December 27, 2007 Yes,big help. My trans is showing some signs of age and I'll have to have it rebuilt at some point. I watched an episode on Muscle Car about auto trans rebuilds and the host mentioned to look for play in the gov. bore but not that it could be sleeved nor to look for grooves in the bore. Thanks again! Quote Link to comment Share on other sites More sharing options...
Monteman1971 Posted December 29, 2007 Author Share Posted December 29, 2007 Hey Phil, My fenders and hood are steel but there are a couple of places that make them. I don't suggest "Bodyworks" if you come across their stuff. It's all very ruff. With my engine out I haven't had a chance to really look into my trans but i will as soon as I'm up and running... Steve Quote Link to comment Share on other sites More sharing options...
Dans '70 Z20 Posted December 29, 2007 Share Posted December 29, 2007 Phil best quality fiberglass hoods, body parts etc are found at http://www.glasstek.com These guys make a quality piece. Hood even has factory looking bracing on underhood side. Dan Quote Link to comment Share on other sites More sharing options...
Guest Phils72 Posted January 1, 2008 Share Posted January 1, 2008 Thanks for the info.I will check into glasstek. Phil Quote Link to comment Share on other sites More sharing options...
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